Element D Services Electrical

Transcription

1 Renovation PART 1 - GENERAL 1.01 OVERVIEW A. This Section supplements Design Guideline Element D5000, with specific criteria for Projects involving construction of alterations to existing buildings. PART 2 - DESIGN CRITERIA 2.01 GENERAL A. The A/E is responsible for surveying existing buildings to determine if adequate space is available for electrical Work and equipment. A/E must not rely upon MD Anderson furnished as-built drawings alone. B. Early in the design phase, arrangements must be made with the MD Anderson Project Manager for access above ceilings to determine field conditions and to locate existing electrical components and utility services. C. Modification versus Replacement Where equipment must be modified to be physically utilized in a Project, the following must be evaluated: 1. Determine if one manufacturer must be used for final responsibility of the modified equipment. 2. Determine if a legitimate cost saving will be realized by modifying the existing equipment rather than installing new. If yes, then modification should be considered. D. Age and Physical Condition: 1. The length of time in service of the wiring, devices and equipment should be reviewed prior to considering reuse. 2. The equipment should be capable of remaining in use for a minimum of 10 years of additional life or having 40 percent of remaining life, if not the equipment shall be replaced. 3. Where equipment has been in operation for a number of years, MDACC shall, in cooperation with Engineer, conduct a physical inspection of terminals, insulation, switching contacts, control wiring etc.,, using recommendations offered by Engineer and other information it deems appropriate, determine what actions are to be included in the project scope.. E. Parts Availability: 1. After the Engineer s site survey s the availability of spare parts for existing equipment should be determined. ODG OF 5

2 Renovation 2. Where the Project involves extending an existing system but the existing equipment spare parts are not available, the Engineer should inform the MD Anderson Project Manager in writing. Specific directions will be given at that time. F. Conduit and Junction Boxes (Boxes): 1. Conduit and boxes in existing walls to be demolished shall be removed. 2. Conduit and boxes in existing walls to remain shall be abandoned in place (if not reused) and the boxes shall be provided with blank covers. 3. Conduit in existing or new ceilings that is not intended for reuse shall be removed back to the panel from where it originates. 4. Conduits that had been run in the existing concrete slab shall be saw-cut off as they enter the slab and then sealed to prevent moisture access. G. Conductors: 1. Conductors with deteriorated or damaged insulation shall be replaced. Conductors must be meggered to assure insulation integrity. 2. Conductors that are not to be reused shall be removed back to the nearest junction box. Where the entire circuit is to be removed, the conductors shall be removed back to the panelboard from which they emanate. 3. Disconnection and removal of telephone cabling may not be the responsibility of the Contractor. Verify with MD Anderson. 4. Disconnection and removal of communication, Nurse Call, Fire Alarm wiring, etc., shall be the responsibility of the Contractor. 5. Contractor shall not attempt to fish new conductors through an existing conduit with existing conductors. All conductors shall be replaced. H. Wiring Devices: 1. Remove devices that are not installed at reusable locations. Boxes shall be blanked. 2. Existing receptacles and switches in good condition, located at acceptable places, may be reused. Non-hospital-grade receptacles shall be replaced in all patient care areas, including but not limited to Exam and Treatment Rooms, with hospital-grade receptacles. I. Lighting Fixtures: 1. Lighting fixtures that cannot be reused shall be removed, including associated wiring to ceiling-mounted junction boxes. 2. Where fixtures are determined to be reusable in new or existing ceilings, they shall be taken down, cleaned and re-lamped prior to re-installation. An economic analysis of labor costs shall be made for reuse or replacement of fixtures. ODG OF 5

3 Renovation J. Panelboards: 1. Consider panelboards for reuse if physical condition, ratings and circuit capacity requirements are met. 2. Panelboards shall be installed in new or existing electrical closets. Corridor-mounted panel boards shall not be used without specific instructions. Refer to other articles of this Manual for closet requirements. 3. In major secondary distribution renovation projects, existing panelboard back boxes may be used as pull boxes for branch circuit transfer. All branch circuit conductors shall be tagged to identify which circuit number they are being transferred to in the new panel. Provide a requirement, in the Contract Documents, for the Contractor to develop and type an accurate Circuit Directory. 4. Provide in the Contract Documents for the Contractor to balance the loads during the branch circuit transfer. K. Owner Retained Equipment: 1. After consulting with MD Anderson, determine if the following items should be retained by the Owner: a. Disconnects of 100 A (amperes) Motors and larger b. Fire Alarm Devices c. Nurse Call System Components d. Panelboards and Circuit Breakers e. Lighting Fixtures f. Special Receptacles g. Transformers 2. Contractor is to properly dispose offsite equipment not to be retained by Owner. L. Concealed or Exposed: 1. Conceal all work wherever possible. Wherever it is physically impractical to conceal conduits due to economic considerations, the Engineer shall consult with the Owner to determine acceptable alternatives. 2. All conductors shall be installed in conduit or in surface metal raceway. 3. Where permission is granted, type AC cable (hospital grade) may be used to fish down to outlets in existing walls as long as lengths do not exceed 3 m (10 feet). Locate a junction box directly above ceiling for the conduit drop to the new outlet. This, however, is not permitted for emergency circuits. Emergency circuits are to be routed in conduit. ODG OF 5

4 Renovation 4. Surface metal raceways shall not be installed on the floor. Service to equipment in open areas shall be served from under the slab or through Tele/power poles wired from the ceiling. M. Continuity of Service: 1. Services passing through areas of remodeling shall be maintained throughout construction period. 2. Circuits that are modified as part of the remodeling Project, which serve areas adjacent to the construction area, shall be re-circuited as part of this Project. PART 3 - SPECIAL CONTRACT DOCUMENT REQUIREMENTS 3.01 GENERAL A. Required demolition of existing electrical systems must be indicated on the Drawings. B. Specific detailing of interfaces between alterations and existing to remain shall be clearly indicated on the Drawings. C. Where existing equipment must be modified to be physically used on a Project, evaluate if initial and operational cost savings will be realized by modifying the existing equipment rather than installing new. Provide recommendations. D. Provide Section(s) to resolve conflicts. Location of new equipment and services must be coordinated with all involved parties. Phasing of construction Work must be coordinated with all involved parties. Phasing of construction work must be coordinated with operation of the facility and MD Anderson staff and be accounted for in the design. E. If MD Anderson wishes to retain existing electrical equipment considered obsolete as a result of modification, A/E should note this on the demolition Drawings; otherwise, the Contractor in accordance with General Conditions of the Contract will dispose of it. F. Note on the Drawings if applicable to the Project, that services passing through areas of renovation shall be maintained throughout the construction period. G. Required demolition of existing electrical systems must be indicated on the Drawings. H. Specific detailing of interfaces between alterations and existing to remain shall be clearly indicated on the Drawings. I. Where existing equipment must be modified to be physically used on a Project, evaluate if initial and operational cost savings will be realized by modifying the existing equipment rather than installing new. Provide recommendations. J. Provide section(s) to resolve conflicts. Location of new equipment and services must be coordinated with all involved parties. Phasing of construction Work must be coordinated with all involved parties. Phasing of construction work must be coordinated with operation of the facility and MD Anderson staff and be accounted for in the design. ODG OF 5

5 Renovation K. If MD Anderson wishes to retain existing electrical equipment considered obsolete as a result of modification, A/E should note this on the demolition Drawings; otherwise, the contractor in accordance with General Conditions of the contract will dispose of it. L. Refer to Owner s Design Guideline Element D5010 Service and Distribution for the requirement of Coordination Study and Arc Flash Hazard Analysis, which may apply to some renovation projects. PART 4 - PRODUCTS 4.01 GENERAL A. New equipment shall be compatible with existing components and systems to which they interface. B. If existing equipment will be reused, the A/E shall check availability of spare parts. C. Refer to Owner s Master Construction Specifications. These are available on the Owner s Design Guidelines website: PART 5 - DOCUMENT REVISION HISTORY Issue Date Revision Description Reviser Initial Adoption of Element Rev Included sustainability requirements throughout document based upon TGCE's evaluation. (Paragraphs 2.01 D 2 & 2.01 D 3) Rev Added 3.01 L for the requirements of Coordination Study and Arc Flash Hazard Analysis. Rev. 3 JCD PL END OF ELEMENT ODG OF 5