Jack Humphrey, Director, Inspection Services July 22, 2014

Transcription

1 ELECTRICAL 2010 The Hartford Steam Boiler Inspection and LOSS Insurance Company PREVENTION Jack Humphrey, Director, Inspection Services July 22, 2014

2 Today s Agenda 1. ELECTRICAL POWER - DISTRIBUTION 2. ELECTRICAL PREVENTIVE MAINTENANCE 3. EPM EVALUATION / SURVEY 4. INFRARED THERMOMETERS 5. RESOURCES Jack Humphrey Jack_Humphrey@HSB.com (925)

3 ELECTRICAL POWER - DISTRIBUTION

4 Simplified Power System Transmission Lines Substation Step Down Transformer Industrial Customer Generating Station Commercial Customer Generating Step Up Transformer Secondary Customer High Voltage Customer

5 Electrical Power Distribution System Primary Fused Switch Transformer 600 V Class Switchboard Distribution Dry-Type Transformer MCC Lighting Panel board Distribution Panel

6 Electrical Distribution System Fused Switch Circuit Breaker Panel Bus Transformer

7 ELECTRICAL PREVENTIVE MAINTENANCE

8 Preventing Electrical Failures Four Key Areas Clean Cool Dry Tight

9 Keep it Clean Dirt and Foreign Contamination Result from manufacturing process environment lack of upkeep Results in elevated temperatures paths to ground improper operation

10 Keep it Cool High Temperature Result from high ambient clogged vent ducts defective fans overload dirty equipment Results in shortened life improper operation

11 Keep it Dry Moisture Result from direct or indirect water humidity condensation Results in reduced insulation strength corrosion paths to ground short circuits

12 Keep it Tight Loose Connections Result from improper installation improper maintenance thermal expansion and contraction Results in arcing surge events fires

13 Common Electrical Failures Figure illustrates specific causes of electrical failures and the individual contribution of each cause. This list is based upon twenty years of HSB claims data.

14 ELECTRICAL PREVENTIVE MAINTENANCE - EVALUATION / SURVEY

15 Electrical Safety SAFETY Stay 10 feet from exposed parts Do not open cabinets Water or excessive moisture Hands Off!

16 Electrical Safety Safety first Use common sense Follow all safety rules Stay within safety lines Never remove covers Stay clear of rotating equipment

17 Electrical System Observations Electrical Exposure - Evaluation Questions to evaluate Answers provided by location Observations made by consultant Indications of potential for failure

18 Is any part of the electrical system greater than twenty-five (25) years old? Yes No

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21 Who is responsible for maintaining the electrical equipment/systems? Electrical Contractor In-House Maintenance Other None

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24 Who conducts planned annual inspections or evaluations of the electrical system? Electrical Contractor In-House Maintenance Other None

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27 Has the complete electrical system received an infrared scan within the last five (5) years? Yes No

28 Did you observe any missing covers on junction boxes, panels, switches and receptacles? Yes No

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33 Did you observe any temporary wiring? Yes No

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36 Did you observe any evidence of moisture or excessive dirt or dust on the outside of the electrical equipment? Yes No

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39 Did you observe any combustible material in the electrical room? Yes No

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41 Have there been any changes to the electrical system in the last three (3) years? Yes No Changes to electrical system Such as loads added or relocated or equipment upgraded or replaced.

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44 Are surge suppression devices installed on main and/or distribution panels? Yes No

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46 INFRARED THERMOMETERS

47 INFRARED THERMOMETERS Temperature range -30 C C (-22 F F) Spot to distance ratio 10:1 (Spot size is 1 at 10 away) Accuracy +/- 1.5 C

48 TYPICAL ITEMS TO BE INSPECTED Transformers Motors Bearings Breakers Panels Disconnects Refractory / Insulation

49 TRANSFORMERS Try to get a temperature reading of the windings Check the nameplate data for temperature limits

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52 MOTORS Check the nameplate data for temperature limits Check the nameplate data

53 BEARINGS Most bearings should not exceed 180 F

54 BREAKER PANELS Breaker should not exceed 120 F or 20 F hotter than other breakers in the panel.

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57 REFRACTORY / INSULATION Look for voids, peeling paint, discoloration, etc.

58 RESOURCES

59 EPM Resources Original equipment manufacturer(oem) maintenance recommendations Hartford Steam Boiler Documents How to Prevent Costly Electrical System Problems Electrical Preventive Maintenance for Small Businesses Recommended Practice for Electrical Preventive Maintenance Many more available at www. HSB.com

60 Industry Guide list National Fire Protection Association (NFPA) 70B, Recommended Practice for Electrical Equipment Maintenance. National Fire Protection Association (NFPA) 70, National Electrical Code. National Fire Protection Association (NFPA) 70E-2004, Standards for Electrical Safety in the Workplace International Electrical Testing Association (NETA), Maintenance Testing Specifications for Electrical Power Distribution Equipment and Systems. Applicable Federal or State OSHA Regulations, including among others 29 CFR , Subpart S (29 CFR ), and the General Duty Clause (29 USC 651, et al, Section 5), or the equivalent state standards

61 THANK YOU VERY MUCH FOR YOUR ATTENTION