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110.16 New 2002 NEC ® Arc Flash Hazard Marking Requirement.

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110.16

New 2002 NEC® Arc Flash Hazard Marking Requirement


110.16 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 Z535.4-1998, Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products.

Reprinted from NEC® 2002


110.16 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 Z535.4-1998, Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products.

Reprinted from NEC® 2002


WARNING

!

Arc Flash and Shock Hazard

Appropriate PPE Required

Courtesy E.I. du Pont de Nemours & Co.


24 inch

Flash Hazard Boundary

3

cal/cm

Flash Hazard at 18 inches

  • 2

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 -

500 V Class 00 Gloves

1 inch

Prohibited Approach -

500 V Class 00 Gloves

WARNING

!

Arc Flash and Shock Hazard

Appropriate PPE Required

Equipment Name:

Slurry Pump Starter

Courtesy E.I. du Pont de Nemours & Co.


24 inch

Flash Hazard Boundary

3

cal/cm

Flash Hazard at 18 inches

  • 2

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 -

500 V Class 00 Gloves

1 inch

Prohibited Approach -

500 V Class 00 Gloves

WARNING

!

Arc Flash and Shock Hazard

Appropriate PPE Required

Equipment Name:

Slurry Pump Starter

Courtesy E.I. du Pont de Nemours & Co.


110.16 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 Z535.4-1998, Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products.

Reprinted from NEC® 2002




Arc fault
Arc perform work?Fault

BoltedShort Circuit

A

B

A

B


Electrical arc
Electrical Arc perform work?

Molten Metal

35,000 °F

Pressure Waves

Sound Waves

Shrapnel

Copper Vapor:

Solid to Vapor

Expands by

67,000 times

Hot Air-Rapid Expansion

Intense Light


TEST 4 perform work?


Results test no 4
Results: Test No.4 perform work?

Sound

P1

141.5 db @ 2 ft.

>2160 lbs/sq.ft

T2

T1

>225°C / 437°F

> 225°C / 437°F

T3

50°C / 122°F

> Indicates Meter Pegged


TEST 3 perform work?


Results test no 3
Results: Test No.3 perform work?

Sound

P1

133 db @ 2 ft.

504 lbs/sq.ft

T2

T1

62°C / 143.6°F

> 175°C / 347°F

T3

(No ChangeFrom Ambient)

> Indicates Meter Pegged


What are the osha regulations and nfpa 70e requirements for working on live equipment
What Are the OSHA Regulations and NFPA 70E Requirements for Workingon “Live” Equipment?

© 2001 Cooper Bussmann, Inc.


Safe work practices
Safe Work Practices Working

OSHA 1910.333 (a) (1) & NFPA 70E 2-1.1.1

not to work “hot” or “live” except :

1. Deenergizing introduces additionalor increased hazards

2. Infeasible due toequipment designor operationallimitations

Wearing Proper PPE?


Prohibited Shock Boundary: Working 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

Flash Protection Boundary (FPB)

Must wear appropriate PPE

FPB dependent on fault level and time duration.

Equipment

Note: shock boundaries dependent on system voltage level


Are there any other means to reduce the risks

WARNING Working

!

Arc Flash and Shock Hazard

Appropriate PPE Required

Courtesy E.I. du Pont de Nemours & Co.

Are There Any Other Meansto Reduce the Risks?


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