New 2002 NEC. Arc Flash Hazard Marking Requirement Cooper Bussmann, Inc.

Transcription

1 New 2002 NEC Arc Flash Hazard Marking Requirement 2001 Cooper Bussmann, Inc.

2 Flash Protection. Switchboards, panelboards, industrial control panels, and motor control centers in other than dwelling occupancies, that are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. FPN No. 1: NFPA 70E-2000, Electrical Safety Requirements for Employee Workplaces, provides assistance in determining severity of potential exposure, planning safe work practices, and selecting personal protective equipment. FPN No. 2: ANSI Z , Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products. Reprinted from NEC Cooper Bussmann, Inc.

3 Flash Protection. Switchboards, panelboards, industrial control panels, and motor control centers in other than dwelling occupancies, that are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. FPN No. 1: NFPA 70E-2000, Electrical Safety Requirements for Employee Workplaces, provides assistance in determining severity of potential exposure, planning safe work practices, and selecting personal protective equipment. FPN No. 2: ANSI Z , Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products. Reprinted from NEC Cooper Bussmann, Inc.

4 2001 Cooper Bussmann, Inc.

5 ! WARNING Arc Flash and Shock Hazard Appropriate PPE Required Courtesy E.I. du Pont de Nemours & Co Cooper Bussmann, Inc.

6 ! WARNING Arc Flash and Shock Hazard Appropriate PPE Required 24 inch Flash Hazard Boundary 3 cal/cm 2 Flash Hazard at 18 inches 1DF PPE Level, 1 Layer 6 oz Nomex, Leather Gloves Faceshield 480 VAC Shock Hazard when Cover is removed 36 inch Limited Approach 12 inch Restricted Approach V Class 00 Gloves 1 inch Prohibited Approach V Class 00 Gloves Equipment Name: Slurry Pump Starter Courtesy E.I. du Pont de Nemours & Co Cooper Bussmann, Inc.

7 ! WARNING Arc Flash and Shock Hazard Appropriate PPE Required 24 inch Flash Hazard Boundary 3 cal/cm 2 Flash Hazard at 18 inches 1DF PPE Level, 1 Layer 6 oz Nomex, Leather Gloves Faceshield 480 VAC Shock Hazard when Cover is removed 36 inch Limited Approach 12 inch Restricted Approach V Class 00 Gloves 1 inch Prohibited Approach V Class 00 Gloves Equipment Name: Slurry Pump Starter Courtesy E.I. du Pont de Nemours & Co Cooper Bussmann, Inc.

8 Flash Protection. Switchboards, panelboards, industrial control panels, and motor control centers in other than dwelling occupancies, that are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. FPN No. 1: NFPA 70E-2000, Electrical Safety Requirements for Employee Workplaces, provides assistance in determining severity of potential exposure, planning safe work practices, and selecting personal protective equipment. FPN No. 2: ANSI Z , Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products. Reprinted from NEC Cooper Bussmann, Inc.

9 Requirements for safe work practices Addresses hazards: Shock Arc Flash Requirements for shock and arc flash boundaries Requirements personal protective equipment 2001 Cooper Bussmann, Inc.

10 What are the hazards as you approach electrical equipment to perform work?

11 Bolted Short Circuit Arc Fault A B A B 2001 Cooper Bussmann, Inc.

12 Electrical Arc 35,000 F Molten Metal Pressure Waves Sound Waves Copper Vapor: Solid to Vapor Expands by 67,000 times Shrapnel Hot Air-Rapid Expansion Intense Light 2001 Cooper Bussmann, Inc.

13 TEST 4

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21 Results: Test No.4 Sound ft. T2 >225 C / 437 F T3 P1 >2160 lbs/sq.ft T1 > 225 C / 437 F 50 C / 122 F > Indicates Meter Pegged 2001 Cooper Bussmann, Inc.

22 TEST 3

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29 Results: Test No.3 Sound ft. T2 62 C / F T3 P1 504 lbs/sq.ft T1 > 175 C / 347 F (No Change From Ambient) > Indicates Meter Pegged 2001 Cooper Bussmann, Inc.

30 What Are the OSHA Regulations and NFPA 70E Requirements for Working on Live Equipment? 2001 Cooper Bussmann, Inc.

31 Safe Work Practices OSHA (a) (1) & NFPA 70E not to work hot or live except : 1. Deenergizing introduces additional or increased hazards 2. Infeasible due to equipment design or operational limitations Wearing Proper PPE? 2001 Cooper Bussmann, Inc.

32 2001 Cooper Bussmann, Inc.

33 Flash Protection Boundary (FPB) Must wear appropriate PPE FPB dependent on fault level and time duration. Equipment Prohibited Shock Boundary: Qualified Persons Only. PPE as if direct contact with live part Restricted Shock Boundary: Qualified Persons Only Limited Shock Boundary: Qualified or Unqualified Persons* * Only if accompanied by Qualified Person Note: shock boundaries dependent on system voltage level

34 Are There Any Other Means to Reduce the Risks?! WARNING Arc Flash and Shock Hazard Appropriate PPE Required Courtesy E.I. du Pont de Nemours & Co Cooper Bussmann, Inc.

35 Specify & Install Finger Safe (IP20) Electrical Products 2001 Cooper Bussmann, Inc.

36 Reduced Fault Current via Current-Limitation 2001 Cooper Bussmann, Inc.