Specification for prefabricated substation housings for 12kV and 36kV switchboards

Transcription

1 1. SCOPE This specification details The Company s requirement for the supply, design, construction and delivery of prefabricated substation housings for 12kV and 36kV switchgear, protection & control equipment and ancillary equipment for use at The Company s Bulk Supply Points, primary substations, switching stations and high voltage customer substation sites. Glass Reinforced Plastic (GRP) enclosures designed to house unit type substations and other switchgear installed on the Company s 6.6kV and 11kV networks are detailed within SUB which forms part of a separate tender. 2. ISSUE RECORD This is a Reference document. The current version is held on the Energy Networks Intranet. It is your responsibility to ensure you work to the current version. Issue Date Issue No. Author Amendment Details May Stuart Sommerville First Issue Jan Stuart Sommerville Internal arc, earthing & fire ratings added Aug Kevin Butter Various updates Aug Frank Berry In line with EE10 solutions 3. ISSUE AUTHORITY Author Owner Issue Authority Name: Frank Berry Title: Lead Engineer Name: Peter Sherwood Title: Substations Manager Name: Jeff Hunt Title: Head of Asset Management Date:.17/8/ REVIEW This is a Reference document which has a 5-year retention period after which a reminder will be issued to either extend retention or archive. 5. DISTRIBUTION This document does not have a maintained distribution list. SP Power Systems Limited Page 1 of 47

2 6. CONTENTS 1. SCOPE ISSUE RECORD ISSUE AUTHORITY REVIEW DISTRIBUTION CONTENTS REFERENCE DOCUMENTS INTRODUCTION DEFINITIONS GENERAL REQUIREMENTS Equipment Description Equipment Approvals Design and Construction General Materials Security Doors Security Alarm Insulation Levels Space Heating and humidity control s Ventilation AC supplies Internal lighting External lighting Emergency Exit Lighting Protection against fire General Escape paths Signage Protection from danger resulting from arc fault Earthing Cable access Containerised solutions (Typically used to house 11kV swgear at Primary substations) Enclosure solutions (Typically used to house 33kV loose fit swgear at Grid substations) Drainage Finishes Maintenance Drawings and further information Schedules to be completed by The Tenderer Dimensions APPENDIX A - SCHEDULES TO BE COMPLETED BY THE TENDERER APPENDIX B - DRAWINGS APPENDIX C - EXAMPLE RAMS SP Power Systems Limited Page 2 of 47

3 7. REFERENCE DOCUMENTS This specification makes reference to, or implies reference to, the following documents. It is important that users of all standards, specifications and other listed documents ensure that they are applying the most recent editions together with any amendments. Health and Safety at Work etc. Act 1974 ScottishPower Safety Rules (Electrical and Mechanical) 4th Edition Construction (Design and Management) Regulations 2007 The Company s Policy on Alcohol and Drugs The Company s General Health, Safety, Welfare and Environmental Requirements for Contractors and their Employees BS 4737 Intruder Alarms BS 5266: Part 1 BS 5378 BS 7671 IEC IEC ENATS SUB SUB SWG SWG Emergency Lighting Safety Signs and Colours The requirements for Electrical Installations High Voltage / Low Voltage prefabricated substations Power Installations exceeding 1 kv a.c. Common rules Distribution switchgear for service up to 36kV (Cable and overhead conductor connected) Distribution primary and secondary substations LV AC supply distribution equipment Integration of 11kV and 33kV switchgear, protection & control and ancillary equipment specifications Specification for 36kV indoor circuit-breakers and switch-disconnectors Primary & secondary substations - Specification for 12kV indoor switchgear 8. INTRODUCTION This specification details The Company s requirement for the supply, design, construction and delivery of prefabricated substation housings for 12kV and 36kV switchgear, protection & control equipment and ancillary equipment for use at The Company s Bulk Supply Points, primary substations, switching stations and high voltage customer substation sites. 9. DEFINITIONS For the purpose of this specification, the following definitions shall apply: The Company SP Distribution Ltd. (SPD) SP Transmission Ltd. (SPT) Refers to SP Distribution Ltd, SP Transmission Ltd, SP Manweb plc and SP Power Systems Ltd. The Distribution Licence Holder for the distribution service area formerly known as ScottishPower. The Transmission Licence Holder for the transmission service area formerly known as ScottishPower. SP Power Systems Limited Page 3 of 47

4 SP Manweb plc (SPM) SP Power Systems Ltd. SP Energy Networks (SPEN) The Engineer Approved The Tenderer The Distribution Licence Holder for the distribution service area formerly known as Manweb. Operator of the network assets on behalf of The Company The brand name of the division of Scottish Power group of Companies that encompasses SP Distribution Ltd, SP Transmission Ltd, SP Manweb plc and SP Power Systems Ltd. The Company s representative having authority over technical matters contained in this specification. Equipment approved in accordance with The Company s Equipment Approvals Procedure, and which is considered suitable for installation on The Company s networks. The supplier invited to tender in accordance with this specification. 10. GENERAL REQUIREMENTS 10.1 Equipment Description The equipment required by this specification shall comprise of prefabricated substation housings. The housing shall comprise of the following main components: - Prefabricated substation housing providing protection from external influences. This shall include all necessary fixings to allow complete housing assembly to be mounted on a concrete plinth Equipment Approvals The prefabricated substation housing must be approved before being accepted for use on The Company s networks in accordance with The Company s equipment Approvals procedure Design and Construction General The housings shall be designed to accommodate various substation and switchgear designs to include: - A container designed with a floor. (Typically used for 11kV Primary Substation solutions) An enclosure designed without a floor. (Typically used at 33kV Grid Supply Points to house loose fitted switchgear. Only the wall / ceiling mounted equipment requires to be included in the design of the structure) The prefabricated substation housing shall be designed and constructed so that normal service, inspection and maintenance can be carried out safely and that risk of unauthorised access is minimised. The housing shall be designed to have a design life of at least 40 years. The housing shall meet the requirements of IEC and be designed for the installation of indoor metal enclosed 12kV or 36kV switchgear, associated control & protection equipment and ancillary equipment as detailed in SUB The 12kV and 36kV switchgear meets the requirements of SWG and SWG is designed for an indoor environment as detailed in clause of ENATS The design of the housing shall therefore ensure that this environment is maintained. The design and layout of the housing to suit the SP Power Systems Limited Page 4 of 47

5 installation and operation of the specific type of switchgear equipment being offered. The housing shall be provided with suitable and sufficient fixing channels to enable the switchgear to be fixed securely in position. Allowance shall be made for the fitting of additional switchgear panels should the switchboard be extended as specified at the time of order. All equipment shall be designed to facilitate all operations to be carried out inside the enclosure by authorised personnel only. To allow for the installation of loose fit switchgear and associated apparatus the following minimum door sizes shall be provided: - 11kV Prefabricated Container Solution 2000w x 2500h (mm) 33kV Housing Solution 2000w x 2600h (mm) The container structure shall be so designed to be safe taking account of the combined loads to which it may be subjected. It shall be fitted with roof-mounted lifting lugs designed to facilitate lifting of the complete housing with all equipment installed. Alternatively the supplier shall provide details in relation to any other lifting methods. The Gross Weight of the housing and its associated equipment shall be clearly marked on an outside wall of the housing. The overall, external and internal dimensions of the housing shall be specified within the schedules in Appendix A. The internal space within the housing shall enable any item of plant to be capable of being removed without interfering with any other item of plant. The supplier shall confirm which of the proposed containers/enclosures are suitable for unescorted transportation on the public road network. Transportation, erection, installation, and decommissioning and dismantling details shall form part of a method statement and generic risk assessments, examples of which shall be forwarded to SPEN as part of this tender submission Materials The materials and components used in the construction of the substation housing shall be suitable for their purpose, correctly used or applied and sufficiently durable, taking account of normal maintenance practices, to ensure the health and safety of people. The materials, fittings, components and other manufactured products or parts thereof must be supported by evidence of suitability, or when installed by an established method, must have recognised qualities and properties of suitability. The materials used in the fabrication and the relevant standards to which they conform should be detailed within the schedules in Appendix A Containers shall be manufactured from steel only details of which can be described in Appendix A Security Doors The main access door shall be fitted with an external stainless steel handle which operates a high security three point locking system. The main access door shall also be fitted with an additional tamper resistant stainless steel shrouded hasp which accepts a Scottish Power standard padlock. Access to the padlock shackle by bolt cutters or angle grinders and levering open of the doors shall be prevented. The hasp design should not provide a climbing aid. Emergency exit door(s) shall be fitted with multi-point locking with an internal emergency panic bar. SP Power Systems Limited Page 5 of 47

6 All doors and associated thresholds shall be fitted with appropriate anti intruder measures to prevent unauthorised entry. SPEN shall free issue the supplier with cylinder locks to allow assembly at the manufacturing stage. SPEN shall log and issue the supplier with required keys which shall be returned when the contract expires Security Alarm A security alarm shall be provided within the housing and shall comply with the provisions of BS4737 and comprise of the following components: - i) 2 x PIR detectors ii) 1 x double door contact iii) 1 x single door contact iv) 1 x single contact on the pressure relief hatch. (n/a where a secured internal mesh is fitted) v) Internal sounder vi) Volt-free contact for remote alarm indication by SCADA equipment. A security panel complete with remote keypad, power supply unit and batteries shall be situated adjacent to the main access door. The cabling for the alarm system shall be installed in mini trunking within the main galvanised trunking. The intruder alarm shall be a Galaxy multi-circuit micro-processor base control unit operated from a mains derived low voltage 1.4A power supply unit with a rechargeable standby unit. Any alternative Alarm offered shall be proven comparable quality and shall be subject to written approval by SPEN Insulation Levels The design of the housing should incorporate effective measures for the conservation of fuel and power. The housing shall conform to the following standards for each of the parameters given below: i) Roof - 0,35 W/m 2 K ii) Walls W/m 2 K iii) Floor 0.6 W/m 2 K (Applicable for container solutions only) Space Heating and humidity control The housing shall be designed to maintain a minimum temperature of +5 o C and a maximum temperature of + 30 o C for a given external ambient temperature range of between -20 o C and +30 o C. It shall allow for sufficient heating associated with a minimum of four complete air changes per day. A self draining wall-mounted dehumidifier shall be provided that is capable of efficient operation between the temperature range of +5 o C and +30 o C and be capable of extracting at least 75ml/hr of moisture from the housing environment at 10 o C, 50% relative humidity (RH). The following conditions shall be assumed. i) Ambient humidity 80%RH ii) Ambient temperature +20 o C iii) Design humidity 50%RH iv) Air changes per day 4 The dehumidifier drying cycle shall be controlled by a humidistat, suitably located away from the dehumidifier airflow, but forming an integral part of the unit. The switching point shall be capable of being set over the range of 40% to 80 %, but factory set at 50%. A second humidistat shall be provided in a similar position for use as a high RH level alarm. This will be preset at 70% and factory sealed. The humidistat shall be set such that the auxiliary contacts open at 70%RH and above, such that when the level is below 70%RH the auxiliary contacts are closed, giving a SP Power Systems Limited Page 6 of 47

7 constant healthy signal to the SCADA system. The contact ratings shall be suitable to meet the rating of the dehumidifier. Both humidistats shall be clearly labelled to indicate their function and RH level setting range. The refrigerant shall be CFC free. The defrosting cycle shall be controlled primarily by an auto-defrost device of the temperature sensing type. Low loss trace heating shall be provided on the dehumidifier drain. The guarantee period for the dehumidification equipment shall be stated within the schedules in Appendix A, together with a statement regarding the estimated life expectancy under normal operation s s shall be horizontal wall mounted tubular type fitted with protective guards. The installation shall include integrated thermostat(s) to ensure that the requirements detailed in section 10.3 are met. The approved tubular heater currently used within SPEN is manufactured by Tube Heat Ltd, Haverhill Suffolk. Any alternative heater offered shall be proven comparable quality and shall be subject to written approval by SPEN Ventilation The housing shall be designed to provide, by natural means, mechanical means or a combination of both, an adequate supply of air inside the housing and shall allow a minimum of four complete air changes per day. Additional provisions shall be made to ensure the adequate ventilation of battery facilities AC supplies The Tenderer shall provide a LV AC supply distribution board in accordance with SUB and also undertake the lighting and small power installation within the housing. A minimum of two double socket outlets shall be installed Internal lighting The internal lighting shall be designed to afford a minimum of 200lux level of illumination. The lighting shall be operated by a metal-clad 1-gang wall switch, positioned adjacent to the entrance door. Suitable emergency lighting shall also be provided in accordance with BS 5266: Part 1 utilising 50% of the normal fittings equipped with a 3 hour battery back-up, Sustained, Non-maintained, normally off until required. A metal-clad key test wall switch shall be installed adjacent to the entrance door External lighting The housing shall be provided with a 150W metal halide floodlight, complete with an integral PIR detector fitted above the entrance door. The minimum detection range shall be 12m and the minimum detection angle shall be 110 o C. An internal wall override switch shall be fitted adjacent to the entrance door Emergency Exit Lighting Self-contained emergency exit lighting shall be installed internally above each door. SP Power Systems Limited Page 7 of 47

8 10.4 Protection against fire General The housing and all associated equipment shall be designed to prevent the propagation of fire either from external sources (e.g. power transformers) or in the event of an electrical failure of the high voltage switchgear or power cables in accordance with clause 8.6 of IEC The materials used in the construction of the housing shall be non-flammable. The housing shall be so constructed to provide adequate fire protection in the event of a transformer fire in an outdoor installation in accordance with clause and table 3 of IEC The transformer shall be assumed to be oil-filled with a oil volume of up to 20,000 litres. The housing shall provide the minimum fire ratings detailed below, such that in the event of an external fire, its stability shall be maintained for this period (i.e. in the event of an external fire, spread of fire to inside the prefabricated substation housing shall not occur for a minimum period as specified by the fire rating). i) Where a fire separating wall is installed between the transformer and the prefabricated substation housing, then the housing shall offer a minimum 60 minute fire rating. ii) Where a minimum clearance of 5m is provided between the transformer and the prefabricated substation housing, then the housing shall offer a minimum 60 minute fire rating. iii) Where no fire separating wall is installed between the transformer and the prefabricated substation housing and the above clearance cannot be achieved then the housing shall offer a minimum 90 minute fire rating. Additionally, in the event of a fire initiating within the housing, spread of fire to external areas shall not occur for a minimum period of 60 minutes The Tenderer shall provide costs for substation housings and indicate the fire rating duration within the schedules in Appendix A. SPEN may design out the level of fire risk by installing the substation housing in a low risk area. For example: - not in the vicinity of other plant and apparatus or buildings. Provision is made within schedules A1, A4 and A7 (Fire Resistant for Low Risk Locations) to allow a cost effective solution to be offered. The Tenderer shall provide details in relation to materials used and fire resistance should the housing be subject to fire as a result of vandalism. The required fire rating requirements shall be specified by The Company at the time of order Escape paths The housing shall be designed such that escape paths and emergency exits can be used in the event of fire in accordance with IEC There shall be a minimum of two exits from any position inside the housing. The exits shall be positioned such that personnel inside the housing shall have unrestricted access to at least one of these exits. The travel distance to the unrestricted available exit door shall not exceed 12m. The minimum unobstructed width of the escape route, or any part thereof, shall be not less than 900mm. The escape route shall have a clear height of at least 2m except that in a doorway this may be reduced to 1.9 m. The minimum door width shall be 750mm. A minimum distance of 600mm shall be provided at the rear of the switchgear to allow for installation, commissioning, fault repair and maintenance activities. Switching operations associated with the switchgear shall be considered as an escape route and a minimum of 900mm shall be provided. SP Power Systems Limited Page 8 of 47

9 Where the civil design, switchgear type and housing construction allows (i.e. no work or maintenance requirements inside the housing) the Company shall install the switchgear adjacent to the rear wall providing a minimum clearance of 50mm. A minimum distance of 500mm shall be maintained when the door of a switchgear or control panel is in the open position. An example sketch showing minimum clearances is detailed within Appendix B. The exit doors shall open outwards. The doors shall open without the use of a key and have a suitable notice explaining the operation of the opening device. The exit doors shall be clearly marked on both sides with a suitable sign. In addition, the doors must be sized and positioned to afford the entry and manoeuvring of additional plant and the removal, or replacement, of pre-fitted switchgear and equipment. The doors shall be fitted with neoprene seals and self-closing mechanisms Signage Signage indicating escape routes shall be installed Protection from danger resulting from arc fault The installation shall be designed and installed so that SPEN personnel and the public are protected as far as reasonably practicable from arc faults. Failure within the prefabricated substation housing due either to a defect or mal-operation may initiate an internal arc, which can constitute a hazard if persons are present. To consider this hazard, distinction must be made between personnel and the general public. Personnel may be inside the substation, however, the general public may be in the vicinity of the substation at any time. The high voltage metal-enclosed switchgear shall be tested to provide protection to operators in accordance with accessibility Type A class IAC AF as detailed in clause of ENATS Evidence of the effectiveness of the design at providing protection to the general public in case of an internal fault shall be provided. This evidence shall be obtained by type testing for class IAC-B substations as detailed in Annex A of IEC Satisfactory proof of performance under the test shall be provided within the schedules in Appendix A. Where the prefabricated substation housing has not been type tested in accordance with Annex A of IEC , then, The Company may consider acceptance of either a simulated test or a calculation. The criteria for acceptance of the simulated test shall be an energy release of equal or greater magnitude to that which would be caused by an internal arc failure at rated voltage and current, using a predetermined value. The Tenderer shall provide full details of any simulated tests or calculations (preferably in lieu of testing) as detailed within IEC at the time of tender for consideration by The Company Earthing A main earthing system shall be provided connecting all extraneous metal of the substation housing to earth. The earthing system shall also be suitable for the connection of all ancillary and control equipment earthing systems. The earthing conductor shall be in accordance with IEC and shall be sized to match the type tested short time current rating of the switchgear installed within the substation housing. The system shall be designed such that in the event of an external HV fault no system fault current shall flow through the earthing system of the housing. The substation earth mat shall be connected directly to the switchgear earth bar at two separate points, normally one at each end of the switchboard. The substation earth mat shall be connected to the housing earth bar at one point only to prevent the possibility of circulating currents through the housing. SP Power Systems Limited Page 9 of 47

10 A permanently fixed engraved label shall be fitted adjacent to each earth connected to the housing earth bar to clearly identify what item is being earthed at that point. Earthing tape shall be copper and the connections shall be within the housing to deter vandalism/theft. An example sketch of a compliant solution is detailed within Appendix B Cable access Containerised solutions (Typically used to house 11kV swgear at Primary substations) The cable trenches and access points shall be fitted with non-magnetic blanking plates and gland plates to prevent entry of vermin or other pests. The blank plates associated with the HV power cables shall be predrilled to suit the cables specified by The Company at the time of order. The pre-drilled holes shall have suitable protection provided to prevent vermin access at site prior to cable installation. All cable holes and other access points shall be covered over during transit with covers that shall be readily removable with light hand tools Enclosure solutions (Typically used to house 33kV loose fit swgear at Grid substations) As there is no floor to the housing, there is no requirement to provide any facilities for cable access Drainage The housing shall be designed to ensure the hygienic and safe disposal of water discharges from the roof and dehumidifier. The roof and the dehumidifier drainage shall be so designed as to channel and pipe any rainwater or condensate to ground level on the outside of the housing. These channels or pipes shall be designed to be robust and vandal resistant Finishes The external finishes shall be heavy duty coatings designed to provide a minimum 10 year period to first maintenance. The external walls, unless otherwise directed will have a final finish colour of RAL7033, Cement grey. The walls and roof shall be constructed and finished in such a way that moisture from the ground or the weather will not damage the fabric or penetrate to the inner surface of the building. The internal walls and ceiling shall be designed in such a way as to provide a minimum 10 year period to first maintenance. The internal walls, unless otherwise directed will have a final finish colour of RAL9010, Pure white. The colour of the floor in containerised solutions shall be red. On completion of delivery and installation any and all damage to any of the surfaces shall be made good to no less a standard than the above finishes Maintenance The prefabricated housing shall be maintenance free as far as practicable. The Tenderer shall provide details of recommended maintenance requirements and frequencies including repairs to damaged paintwork etc. The housing shall be designed so that any inspection and maintenance can be carried out safely. Where special tools or equipment are required for maintenance of the housing then the Tenderer shall provide details at the time of Tender within the schedules in Appendix A. SP Power Systems Limited Page 10 of 47

11 The surface finish of the entire assembly shall be such that it can reasonably be expected to have a minimum of a 40-year life with little maintenance. Full details of the materials from which the housing is constructed shall be submitted with the tender, along with the proposed surface finish of each part. The materials, fittings, components and other manufactured products or parts thereof whose suitability depends upon proper maintenance or periodic renewal must be readily accessible or positioned so that replacement is reasonably practicable. Recommendations for maintenance and renewal requirements shall be listed within the schedules in Appendix A Drawings and further information The Tenderer shall provide additional descriptive material and drawings as required to fully detail the layout and construction of the housing and the equipment being supplied. As built drawings and an Operation and Maintenance Manual shall be provided with each unit supplied. SP Power Systems Limited Page 11 of 47

12 10.11 Schedules to be completed by The Tenderer The Tenderer shall complete all schedules in Appendix A, including providing details of all departures from this specification. Costs shall also be submitted. The enclosure types are detailed within the schedules in Appendix A which include: - 11kV Prefabricated Container Solution Schedule A1: Schedule A2: Schedule A3: (Fire Resistant for low risk locations) (60minute fire rating) (90minute fire rating) 33kV Housing Solution Switchgear with Integrated protection Schedule A4: Schedule A5: Schedule A6: (Fire Resistant - low risk locations) (60minute fire rating) (90minute fire rating) 33kV Housing Solution Switchgear and Control Panels Schedule A7: Schedule A8: Schedule A9: (Fire Resistant for low risk locations) (60minute fire rating) (90minute fire rating) Schedule A10: Departures from this Specification Pricing Schedules Schedule A11: 11kV Container Solution Schedule A12: 33kV Housing solution Switchgear with Integrated Protection. Schedule A13: 33kV Housing solution Switchgear with Control Panels Schedule A14: - Ancillary apparatus and equipment Drawings for typical layouts (Type A to Type O) are detailed in Appendix B RAMS associated with transportation, erection, installation, and decommissioning and dismantling shall be detailed in Appendix C. SP Power Systems Limited Page 12 of 47

13 10.12 Dimensions It is the responsibility of the Company to determine the correct size of housing required at the time of placing an order in reference to the dimension details. This will ensure that adequate access and egress clearances are achieved. This includes where there is a requirement to install a combination of 33kV and 11kV switchgear types. For Example: 3 x 33kV panels plus 7 x 11kV panels within the one enclosure in SPM. The number of panels is stated within the schedules as an indication only. For example: - The 5 panel option would be used to house 3 switchgear panels allowing for 2 panels to be extended in future should the substation require to be extended. Similarly the 7 panel option would be used to house 5 switchgear panels allowing for 2 panels to be extended in future should the substation require to be extended etc. NB. The Internal Dimensions given in the schedules are the minimum clear space required by the Company. The Tenderer shall ensure that the construction of the Container or Housing and all of the internal fixtures and fittings (with the exception of the de-humidifier) do not reduce this space. SP Power Systems Limited Page 13 of 47

14 APPENDIX A - SCHEDULES TO BE COMPLETED BY THE TENDERER SCHEDULE A1: 11kV Prefabricated Containerised Solution Technical Details Fire resistant for Low Risk Locations Information Technical Details Type A B C D E Internal Dimensions l x d x h (m) 7.5x2.8x3 8.5x2.8x3 10.5x2.8x3 12.5x2.8x3 13.5x2.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details Description of floor SP Power Systems Limited Page 14 of 47

15 SCHEDULE A2: 11kV Prefabricated Containerised Solution Technical Details 60 minute Fire Rating Information Technical Details Type A B C D E Internal Dimensions l x d x h (m) 7.5x2.8x3 8.5x2.8x3 10.5x2.8x3 12.5x2.8x3 13.5x2.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details Description of floor SP Power Systems Limited Page 15 of 47

16 SCHEDULE A3: 11kV Prefabricated Containerised Solution Technical Details 90 minute Fire Rating Information Technical Details Type A B C D E Internal Dimensions l x d x h (m) 7.5x2.8x3 8.5x2.8x3 10.5x2.8x3 12.5x2.8x3 13.5x2.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details Description of floor SP Power Systems Limited Page 16 of 47

17 SCHEDULE A4: 33kV Housing Solution Technical Details Switchgear with Integrated Protection Fire Resistant for Low Risk Locations Information Technical Details Type F G H I J Internal Dimensions Switchgear Only l x d x h (m) 7.5x3.8x3 8.5x3.8x3 10x3.8x3 11x3.8x3 13.5x3.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details SP Power Systems Limited Page 17 of 47

18 SCHEDULE A5: 33kV Housing Solution Technical Details Switchgear with Integrated Protection 60 minute Fire Rating Information Technical Details Type F G H I J Internal Dimensions Switchgear Only l x d x h (m) 7.5x3.8x3 8.5x3.8x3 10x3.8x3 11x3.8x3 13.5x3.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details SP Power Systems Limited Page 18 of 47

19 SCHEDULE A6: 33kV Housing Solution Technical Details Switchgear with Integrated Protection 90 minute Fire Rating Information Technical Details Type F G H I J Internal Dimensions Switchgear Only l x d x h (m) 7.5x3.8x3 8.5x3.8x3 10x3.8x3 11x3.8x3 13.5x3.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details SP Power Systems Limited Page 19 of 47

20 SCHEDULE A7: 33kV Housing Solution Technical Details - Switchgear and Control Panels Fire Resistant for Low Risk Locations Information Technical Details Type K L M N O Internal Dimensions Switchgear & Control panels l x d x h (m) 12x3.8x3 14x3.8x3 16x3.8x3 18x3.8x3 22x3.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details SP Power Systems Limited Page 20 of 47

21 SCHEDULE A8: 33kV Housing Solution Technical Details - Switchgear and Control Panels 60 minute Fire Rating Information Technical Details Type K L M N O Internal Dimensions Switchgear & Control panels l x d x h (m) 12x3.8x3 14x3.8x3 16x3.8x3 18x3.8x3 22x3.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details SP Power Systems Limited Page 21 of 47

22 SCHEDULE A9: 33kV Housing Solution Technical Details - Switchgear and Control Panels 90 minute Fire Rating Information Technical Details Type K L M N O Internal Dimensions Switchgear & Control panels l x d x h (m) 12x3.8x3 14x3.8x3 16x3.8x3 18x3.8x3 22x3.8x3 Gross Weight (kg) Lead Time Insulation levels (W/m 2 K) Description of Materials and Construction method Description & manufacturer of main parts components Maintenance requirements and intervals Special tool requirements Internal Arc Details Fire Rating Details SP Power Systems Limited Page 22 of 47

23 SCHEDULE A10: Departures from this specification The Tender will be deemed to be compliant with this specification except to the extent that deviations are stated in this schedule. The Tenderer shall list all departures from this specification below. Clause No. Details of non- compliance or departures from this specification SP Power Systems Limited Page 23 of 47

24 SCHEDULE A11: Pricing Schedules for 11kV Containerised Solution 11kV Containerised Solution with Fire Resistance for Low Risk Locations Type A B C D E External Dimensions l x d x h (m) Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) 7.5x2.8x3 8.5x2.8x3 10.5x2.8x3 12.5x2.8x3 13.5x2.8x3 Total Cost ( ) 11kV Containerised Solution with 60 minute Fire Rating Type A B C D E External Dimensions l x d x h (m) Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) 7.5x2.8x3 8.5x2.8x3 10.5x2.8x3 12.5x2.8x3 13.5x2.8x3 Total Cost ( ) 11kV Containerised Solution with 90 minute Fire Rating Type A B C D E External Dimensions l x d x h (m) Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) 7.5x2.8x3 8.5x2.8x3 10.5x2.8x3 12.5x2.8x3 13.5x2.8x3 Total Cost ( ) SP Power Systems Limited Page 24 of 47

25 SCHEDULE A12: Pricing Schedules for 33kV Housing Solution - Switchgear with Integrated Protection 33kV Solution with Fire Resistance for Low Risk Locations Type F G H I J External Dimensions l x d x h (m) 7.5x3.8x3 8.5x3.8x3 10x3.8x3 11x3.8x3 13.5x3.8x3 Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) Total Cost ( ) 33kV Solution with 60 minute Fire Rating Type F G H I J External Dimensions l x d x h (m) 7.5x3.8x3 8.5x3.8x3 10x3.8x3 11x3.8x3 13.5x3.8x3 Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) Total Cost ( ) 33kV Solution with 90 minute Fire Rating Type F G H I J External Dimensions l x d x h (m) 7.5x3.8x3 8.5x3.8x3 10x3.8x3 11x3.8x3 13.5x3.8x3 Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) Total Cost ( ) SP Power Systems Limited Page 25 of 47

26 SCHEDULE A13: Pricing Schedules for 33kV Housing Solution- Switchgear and Control Panels 33kV Solution with Fire Resistance for Low Risk Locations Type K L M N O External Dimensions l x d x h (m) 12x3.8x3 14x3.8x3 16x3.8x3 18x3.8x3 22x3.8x3 Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) Total Cost ( ) 33kV Solution with 60 minute Fire Rating Type K L M N O External Dimensions l x d x h (m) 12x3.8x3 14x3.8x3 16x3.8x3 18x3.8x3 22x3.8x3 Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) Total Cost ( ) 33kV Solution with 90 minute Fire Rating Type K L M N O External Dimensions l x d x h (m) 12x3.8x3 14x3.8x3 16x3.8x3 18x3.8x3 22x3.8x3 Cost of Basic Housing and fabrication ( ) Cost to supply, off-load and install including fixtures and fittings and Misc. equipment. ( ) Total Cost ( ) SP Power Systems Limited Page 26 of 47

27 SCHEDULE A14: - Pricing Schedule for Ancillary Apparatus and Equipment This is a Design and Build Contract. Enquiry Specification Ref: Schedule of Rates for Electrical Installation Works The Contractor shall complete the following Schedule of Rates that would be used in the valuation of any "variations" or "alternatives" instructed in writing by the Company. These rates shall be analogous to those used by the Contractor in pricing the main items and shall contain an amount for Contractor's Profit and all overheads and on costs, as appropriate. These Schedules are only to be used where the Company has given written permission to the Contractor for additional incidental works. Installation, when stated in the rates, is to include all fixtures, fittings, spacers, screws, plugs, anchors etc that will be required to fix in place (install) the particular item. All works are to be undertaken to the latest SPEN Standards and Specifications and / or the latest Industry Standards and Specifications. All materials must be from the SPEN Approved lists. e.g. CAB , CAB All of the testing & commissioning that is required to make the plant and equipment ready in all respects for connection to the System and subsequent energisation by SPEN is to be undertaken by the Contractor. Item No Description CODE DESCRIPTION UNITS MAT COST HOURS LAB RATE LAB COST ACTIVITY RATE 1000 LABOUR 1001 Design Engineer hr 1002 Commissioning Engineer hr 1003 Project Manager hr 1004 Site Supervisor hr 1005 Wireman hr 1006 Fitter hr 1008 Draughtsman hr 1009 Labourer hr 1010 Standby Man, SPEN S/R 3/4, SB 1, EN 1 hr 2000 SUBSTATION LIGHTING & SMALL POWER 2008 Fused Switch, 100A, DP, wall mounted, supply and install each 2009 Internal wiring, 1.5 mm2, LSOH installed in conduit / trunking m 2010 Internal wiring, 2.5 mm2, LSOH installed in conduit / trunking m 2011 Internal wiring, 4 mm2, LSOH installed in conduit / trunking m 2012 Internal wiring, 6 mm2, LSOH installed in conduit / trunking m 2013 Internal wiring, 10 mm2, LSOH installed in conduit / trunking m 2014 Internal wiring, 16 mm2, LSOH installed in conduit / trunking m 2015 Isolator, 100A, DP, wall mounted, supply and install each 2016 Fused Switch, 100A, 3P, wall mounted, supply and install each 2017, 1ph, 12 way, wall mounted, supply and install each 2018, 3ph, 12 way, wall mounted, supply and install each 2019 MCB, 1ph, 6A, type A to D, supply and install each 2020 MCB, 1ph, 10A, type A to D, supply and install each 2021 MCB, 1ph, 16A, type A to D, supply and install each 2022 MCB, 1ph, 20A, type A to D, supply and install each 2023 MCB, 1ph, 32A, type A to D, supply and install each 2024 MCB, 1ph, 50A, type A to D, supply and install each 2025 MCB, 1ph, 32A, type 30mA RCD, supply and install each 2026 MCB, 3ph, 6A, type A to D, supply and install each 2027 MCB, 3ph, 32A, type A to D, supply and install each 2028 Power Supply Monitor, 3ph, supply and install each mm plastic conduit, supply and install m mm plastic conduit, supply and install m mm plastic conduit, supply and install m mm galvanised conduit, supply and install m mm galvanised conduit, supply and install m mm galvanised conduit, supply and install m mm plastic conduit bends and boxes, supply and install m mm plastic conduit bends and boxes, supply and install m mm plastic conduit bends and boxes, supply and install m mm galvanised conduit bends and boxes, supply and install m mm galvanised conduit bends and boxes, supply and install m mm galvanised conduit bends and boxes, supply and install m x 50 mm plastic trunking c/w lid, supply and install m x 75 mm plastic trunking c/w lid, supply and install m x 50 mm galvanised trunking c/w lid, supply and install m x 75 mm galvanised trunking c/w lid, supply and install m x 41 mm galvanised channel, supply and install m 2046 fixings and brackets including flat joint pieces, channel nuts and screws for 41 x 41 channel, supply and install m 2047 base plate for 41 x 41 channel, supply and install each 2048 Tubular heater, 2 kw, supply and install each 2049 Panel heater, 2 kw, c/w integral thermostat, supply and install each 2050 Room thermostat for use with the tubular heater, supply and install each 2051 Plastic surface mounted switchsocket outlet 2 gang, c/w back box, supply and install each 2052 Plastic surface mounted connection unit DP switched, fused with neon, c/w back box, supply and install each 2053 Plastic surface mounted connection unit DP switched, fused with flex outlet and neon c/w back box, supply and install each 2054 Plastic surface mounted switch, 1 gang SP, 2 way, c/w back box, supply and install each 2055 Plastic surface mounted switch, 2 gang SP, 2 way, c/w back box, supply and install each 2056 Plastic surface mounted switch module, key operated for emergency lighting, c/w front plate and back box, supply and install each 2057 Plastic surface mounted data module, telephone outlet master, c/w front plate and back box, supply and install each SP Power Systems Limited Page 27 of 47

28 2000 SUBSTATION LIGHTING & SMALL POWER (cont.) 2058 Metalclad surface mounted switchsocket outlet 2 gang, c/w back box, supply and install each 2059 Metalclad surface mounted connection unit DP switched, fused with neon, c/w back box, supply and install each 2060 Metalclad surface mounted connection unit DP switched, fused with flex outlet and neon c/w back box, supply and install each 2061 Metalclad surface mounted switch, 1 gang SP, 2 way, c/w back box, supply and install each 2062 Metalclad surface mounted switch, 2 gang SP, 2 way, c/w back box, supply and install each 2063 Metalclad surface mounted switch module, key operated for emergency lighting, c/w front plate and back box, supply and install each 2064 Metalclad surface mounted data module, telephone outlet master, c/w front plate and back box, supply and install each 2065 Plastic surface mounted socket outlet, 16A 2P+E German, c/w back box, supply and install each 2066 Light, Fluorescent, impact resistant, IP65, 1 x 58W, HF, c/w conduit box mounting kit, supply and install each 2067 Light, Fluorescent, impact resistant, IP65, 2 x 58W, HF, c/w conduit box mounting kit, supply and install each 2068 Light, Fluorescent, impact resistant, IP65, 1 x 58W, HF, 3 hour non-maintained emergency, c/w conduit box mounting kit, supply and install each 2069 Light, Fluorescent, impact resistant, IP65, 2 x 58W, HF, 3 hour non-maintained emergency, c/w conduit box mounting kit, supply and install each 2070 Light, Fluorescent, Bulkhead type, IP65, 2 x 11W, supply and install each 2071 Light, Fluorescent, Bulkhead type, IP65, 8W, 3 hour non-maintained exit light, c/w legend panels, down, left or right, supply and install each 2079 Dehumidifier, EBAC CD30E (or approved equal), supply and install each 2080 Light, area flood, wall mounted, IP54, 150W halogen, c/w PIR sensor and timer, supply and install each 2081 Test and commission the L&SP installation on completion sum 2082 Miscellaneous sundries sum 2083 Isolator, 32A, 3P, wall mounted, padlockable, supply and install each 2084, 110 volt, DP, GE Redspot type (or approved equal), c/w fuses and links each 2085, 48 volt, DP, GE Redspot type (or approved equal), c/w fuses and links each 3000 SUBSTATION EARTHING 3001 Bare copper tape, 25 x 3 mm, clipped direct, supply and install m 3002 Bare copper tape, 38 x 6 mm, clipped direct, supply and install m 3003 Bare copper tape, 40 x 4 mm, clipped direct, supply and install m 3009 Tape clip, metallic, supply and install each 3010 Tape clip, non-metallic, supply and install each 3019 Flexible braid bond, 25 x 3.5 x 400 mm, supply and install each 3025 Test installation on completion sum 3026 Miscellaneous sundries sum 4000 CABLE LADDER SUPPLY & INSTALLATION Cable Ladder, Galvanised, Medium Duty, c/w All Splices, Fixtures, Fittings and Equipotential Bonding mm, straight, gauge 1.6 mm m mm, straight, gauge 1.6 mm m mm, straight, gauge 1.6 mm m mm, straight, gauge 1.6 mm m mm, straight, gauge 1.6 mm m mm, flat bend each mm, flat bend each mm, flat bend each mm, flat bend each mm, flat bend each mm, inside riser each mm, inside riser each mm, inside riser each mm, inside riser each mm, inside riser each mm, outside riser each mm, outside riser each mm, outside riser each mm, outside riser each mm, outside riser each mm, equal tee each mm, equal tee each mm, equal tee each mm, equal tee each mm, equal tee each 5000 SECURITY 5001 Supply, install, test and commission an intruder alarm to comply with BS EN , grade 2. The system shall comprise as a minimum a power supply with each battery back-up, control panel, 2 sets of door contacts, 2 motion detectors, external self powered sounde SP Power Systems Limited Page 28 of 47

29 APPENDIX B - DRAWINGS Sketch Reference Type Size (l x d x h) (metres) Voltage Description 1 A 7.5 x 2.8 x 3 11kV 5 panels 2 B 8.5 x 2.8 x 3 11kV 7 panels 3 C 10.5 x 2.8 x 3 11kV 11 panels 4 D 12.5 x 2.8 x 3 11kV 15 panels 5 E 13.5 x 2.8 x 3 11kV 17 panels 6 F 7.5 x 3.8 x 3 33kV 5 panels - Switchgear with Integrated Protection 7 G 8.5 x 3.8 x 3 33kV 7 panels - Switchgear with Integrated Protection 8 H 10 x 3.8 x 3 33kV 9 panels - Switchgear with Integrated Protection 9 I 11 x 3.8 x 3 33kV 11 panels - Switchgear with Integrated Protection 10 J 13.5 x 3.8 x 3 33kV 15 panels - Switchgear with Integrated Protection 11 K 12 x 3.8 x 3 33kV 5 panels - Switchgear plus Separate Control Panels 12 L 14 x 3.8 x 3 33kV 7 panels - Switchgear plus Separate Control Panels 13 M 16 x 3.8 x 3 33kV 9 panels - Switchgear plus Separate Control Panels 14 N 18 x 3.8 x 3 33kV 11 panels - Switchgear plus Separate Control Panels 15 O 22 x 3.8 x 3 33kV 15 panels - Switchgear plus Separate Control Panels kV &33kV Example showing minimum clearance requirements as detailed in Section kV &33kV Example of earthing and bonding arrangements. SP Power Systems Limited Page 29 of 47

30 Specification for prefabricated substation housings LAYOUT SKETCH 1 OF 17 Pressure Relief / Blast Panel 1000mm DE-H 1000mm 7500mm LV & Isol 600mm rack E / Exit Door Main Entrance Double Door Double S/O Notes: Size A, 11kV, 5 Panels 7500mm(l) x 2800mm(d) x 3000mm(h), (clear internal sizes). E / Exit light above each door. 1 off, De-humidifier, EBAC CD30E or equivalent, mounted at high level. Cable rack installed at high level for SPEN multicore cables using trapeze type supports. LV to be 3ph, 8 way, c/w 3ph phase fail alarm relay. 230V LV AC supplied from existing LVAC room to FSW mounted below. 2 off, double switched socket outlets with RCD protection. 2 off, standard 1 kw panel heaters c/w integral thermostats. Cable rack to be 600mm wide. Telephone mounting board (plywood) to be provided adjacent to main entrance door, 400h x 300 w x 15d. SP Power Systems Limited Page 30 of 47