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ELECTRICAL WORK

PRACTICES

Hazardous (Classified) LocationsElectrical Safety Work PracticesWork Practice Selection and Use

Equipment UsePersonal Protection Safeguards.

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Introduction

This module is based on 29CFR 1910 Subpart S andcovers electrical workrequirements designed tominimize potential accidents.

The Occupational Safety andHealth Administrations

(OSHA) standards weredeveloped to cover electricalsystem parts an employeewould normally use or contact.In general, all equipment

should be de-energized beforean employee works on it. Otherwise, protective

equipment and insulated toolsare required.

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Objectives

At the end of the Electrical Work Practicesmodule, you should be able to:

Identify hazardous locations

Define proper safety related work practices

Define safeguards for personal protection.

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Hazardous (Classified)

Locations

Hazardous (classified)locations present a realthreat to worker safety.

They are areas where a

potential for explosion andfire exist due to thepresence of flammable: Gases Vapors Finely pulverized dusts

Ignitable fibers or flyings.

The Hazardous (Classified)Locations section is basedon 29 CFR 1910.307.

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Hazardous (Classified)

Locations

It presents a description ofand the requirements forworking in hazardous(classified) locations.

This section covers thetopics listed on the left.

29 CFR 1910.307 is basedon the National ElectricalCode (NEC), NFPA 70.

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Causes

Hazardous locations canbe found in mostworkplaces.

A hazardous (classified)location may result from thenormal processing ofcertain volatile chemicals,gases, grains, etc., or it

may result from accidentalfailure of storage systemsfor these materials.

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Causes

It is also possible that ahazardous location mayoccur when volatilesolvents or fluids, used in a

normal maintenanceroutine, vaporize to form anexplosive atmosphere.

Each room, section, or area

shall be consideredindividually whendetermining hazardousclassification.

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Precaution

Despite the hazards of alocation, every precautionmust be taken to guardagainst ignition of theatmosphere.

Certainly no open flames arepermitted in these locations.

Electric equipment capable ofigniting flammable materials orgases shall not be used,unless measures are taken toprevent hazardous conditions

from developing. There are many ways in which

electrical equipment can actas a source of ignition in ahazardous location:

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Precaution

Switches, circuit breakers,motor starters, contactors,plugs, and receptacles allrelease arcs and sparks ascontacts open and close

during normal operation Lighting fixtures and motors

are classified as "heatproducing". They will becomea source of ignition if theirsurface temperature exceedsthe ignition temperature of the

flammable material or gas An abnormality or failure in an

electrical system, such as thefailure of insulation, canrelease sparks, arcs, or heat.

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Wiring Installation

It is important to have anawareness of the problemsthat electrical equipment andwiring create when they arelocated in hazardous

(classified) locations becauseseveral OSHA standardsrequire the installation ofelectrical wiring andequipment in these locations.

Most of these locations aredefined in the "Hazardous

(Classified) Locations" moduleavailable from the "HazardousMaterials" selection on themain menu.

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