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110.16 New 2002 NEC ® Arc Flash Hazard Marking Requirement

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Presentation Transcript
slide1
110.16

New 2002 NEC® Arc Flash Hazard Marking Requirement

slide2

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

slide3

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

slide5

WARNING

!

Arc Flash and Shock Hazard

Appropriate PPE Required

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

slide6

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.

slide7

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.

slide8

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

slide9
Requirements for safe work practices
  • Addresses hazards:
    • Shock
    • Arc Flash
  • Requirements forshock and arc flashboundaries
  • Requirementspersonal protectiveequipment
arc fault
ArcFault

BoltedShort Circuit

A

B

A

B

electrical arc
Electrical Arc

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

results test no 4
Results: Test No.4

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

results test no 3
Results: Test No.3

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

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?

slide33

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

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

!

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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