Introduction to the N.C. Department of Labor OSH Division

Introduction to the N.C. Department of Labor OSH Division

Electrical Safety in General Industry 1910 Subpart S This presentation was created by the N.C. Department of Labor for safety and health training. Objectives In this course, students will become familiar with: Common electrical hazards Electrical utilization systems General requirements Wiring design and protection Wiring methods, components, and equipment for general use

This presentation was created by the N.C. Department of Labor for safety and health training. Electrical Hazards Electric shock/electrocution occurs when current flows through the body causing damage Burns are caused by arc blast or hot conductors: - Thermal - Electrical Indirect falls from ladders, scaffolds or other walking - working surfaces

This presentation was created by the N.C. Department of Labor for safety and health training. Electrical Hazards Explosions are caused when electricity provides a source of ignition for an explosive mixture in the atmosphere Fires are caused by overloading circuits or excessive current flowing through faulty wiring; setting fire to insulation and surrounding materials

This presentation was created by the N.C. Department of Labor for safety and health training. Electrical Utilization Systems 1910.302(a)(1) Scope and application - Electrical installations and utilization equipment installed or used within or on buildings, structures and other premises: Yards Carnivals Parking and other lots Mobile homes Recreational vehicles Industrial substations Conductors that connect the installations to a supply of

electricity This presentation was created by the N.C. Department of Labor for safety and health training. Electrical Utilization Systems 1910.302(a)(2) Not covered - Installations in ships - Installations underground in mines - Installations of railways for generation exclusively for signaling and communication purposes - Installations of communication equipment under the exclusive control of communication utilities - Installations under the exclusive control of electric utilities for the purpose of communication or

metering This presentation was created by the N.C. Department of Labor for safety and health training. Extent of Application 1910.302(b) Requirements are applicable to all installations, regardless of when they were designed or installed 1910.302(b)(1) Installations made after March 15, 1972, shall comply with the provisions of 1910.302 through 1910.308, except paragraphs (b) (3) and (b)(4) of this section

Requirements applicable to installations made after April 16, 1981 1910.302(b)(1) and 1910.302(b)(3) Requirements applicable to installations made after August 13, 2007 1910.302(b)(1), 1910.302(b)(3) and 1910.302(b)(4) This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(b)(1) Examination installation, and use of

equipment - Electrical equipment must be free from recognized hazards: Cables exposed to sharp edges Splices Bare conductors This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(b)(2) Installation and use

- Listed or labeled equipment shall be installed and used in accordance with its listing and labeling This presentation was created by the N.C. Department of Labor for safety and health training. Nationally Recognized Testing Laboratories Canadian Standards Association (CSA International) Curtis-Straus LLC (CSL) FM Approvals LLC (FM) Intertek Testing Services NA, Inc. (ITSNA) MET Laboratories, Inc. (MET) Nemko North America, Inc. (NNA) NSF International (NSF)

QPS Evalutaion Services Inc. SGS U.S. Testing Company, Inc. (SGSUS) Southwest Research Institute (SWRI) TUV SUD America, Inc. (TUVAM) TUV SUD Product Services GmbH (TUVPSG) TUV Rheinland of North America, Inc. (TUV) Underwriters Laboratory Inc. (UL) This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(b)(3) Insulation integrity

- Completed wiring installations must be free from short circuits This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(b)(4) Interrupting rating - Sufficient for the nominal circuit voltage and current available Note: 6.3 AMP, 240 VOLT TIME LAG FUSE

This presentation was created by the N.C. Department of Labor for safety and health training. American Wire Gauge (AWG) 18 AWG solid 14 AWG stranded Note: A larger gauge number indicates a smaller size wire This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements

1910.303(b)(6) Deteriorating agents - Unless identified for use in the operating environment, no conductors or equipment shall be: Located in damp or wet locations Exposed to agents that have a deteriorating effect on the conductors or equipment Exposed to excessive temperatures This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements

1910.303(b)(7) Mechanical execution of work - Equipment shall be installed in a neat workmanlike manner This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(b)(7)(i)

Unused openings shall be effectively closed to afford protection substantially equivalent to the wall of the equipment This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(b)(7)(ii) Conductors shall be racked to provide ready and safe access in underground and subsurface for

installation and maintenance NO! This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(c)(3) Splices - Splicing devices suitable for use - Brazing, welding, or soldering - Splices must be joined

mechanically and electrically secure before soldering YES NO This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(d) Arcing parts

- Parts of electric equipment that produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all combustible material This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(e) Markings

- Electrical equipment must have the manufacturer's name, trademark, or other descriptive marking - Must provide voltage, current, wattage, or other ratings as necessary - Must have sufficient durability to withstand the environment involved This presentation was created by the N.C. Department of Labor for safety and health training. General Requirements 1910.303(f)(2)-(3)

Disconnecting means and circuits - Each service, feeder, and branch circuit, at its disconnecting means or over-current device, must be legibly marked to indicate its purpose - Markings required shall be durable and withstand the environment involved This presentation was created by the N.C. Department of Labor for safety and health training.

General Requirements 1910.303(f)(4) Capable of accepting a lock - Disconnecting means shall be capable of being locked in the open position This presentation was created by the N.C. Department of Labor for safety and health training. Space About Electrical Equipment

1910.303(g)(1) Sufficient access and working space must be provided and maintained to permit ready and safe operation and maintenance of equipment NCDOL Photo Library This presentation was created by the N.C. Department of Labor for safety and health training. Space About Electrical Equipment 1910.303(g)(1)(i)(A)

TABLE S1. MINIMUM DEPTH OF CLEAR WORKING SPACE AT ELECTRIC EQUIPMENT, 600 V OR LESS Minimum clear distance for condition Nominal voltage to ground 2,3 Condition A Condition B Condition C m

m m ft 0.9 3.0 1.2 4.0 ft

0 - 150 1 0.9 1 151 - 600 1 0.9 1

0.9 ft 3.0 1 1 3.0 3.0 1.0

3.5 Condition A Exposed live parts on one side and no live or grounded parts on the other side of the working space Condition B Exposed live parts on one side and grounded parts on the other side Condition C Exposed live parts on both sides of the work space with the operator between This presentation was created by the N.C. Department of Labor for safety and health training. Space About Electrical Equipment 1910.303(g)(1)(i)(B)-(C) Width of working space in front of

the electric equipment shall be the width of the equipment or 762 mm (30 inches), whichever is greater Workspace shall be clear and extend from the grade, floor, or platform to the height required 30 min. This presentation was created by the N.C. Department of Labor for safety and health training. Guarding of Live Parts

1910.303(g)(2)(i) Live parts of electric equipment operating at 50 volts or more must be guarded This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Design and Protection 1910.304(a)(2) Polarity of connections

- No grounded conductor may be attached to any terminal or lead so as to reverse designated polarity This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Design and Protection 1910.304(a)(2) This presentation was created by the N.C. Department of Labor for safety and health training. Receptacles and Cord Connectors

1910.304(b)(2)(i) Receptacles installed on 15- and 20- ampere branch circuits shall be of the grounding type - Except as permitted for replacement receptacles in paragraph (b)(2)(iv) Pre-1959 Post-1959 This presentation was created by the N.C. Department of Labor for safety and health training.

Receptacles and Cord Connectors 1910.304(b)(2)(iv)(C)(2) A nongrounding - type receptacle may be replaced with a GFCI Protected type receptacle and shall be marked GFCI Protected and No Equipment Ground Equipment grounding conductor may not be connected to such grounding-type receptacles GFCI Protected Note: Marked GFCI Protected and No

Equipment Ground No Equipment Ground Ground Fault Circuit Interrupter (GFCI) This presentation was created by the N.C. Department of Labor for safety and health training. GFCI Protection for Personnel 1910.304(b)(3)(i) All 125 volt receptacles installed in bathrooms or on rooftops shall have GFCI protection This presentation was created by the N.C. Department of

Labor for safety and health training. GFCI Protection for Personnel 1910.304(b)(3)(ii)(A) Temporary wiring installations - All 125 volt, single phase, 15 - 20 ampere, shall be GFCI protected during maintenance, remodeling or construction like activities This presentation was created by the N.C. Department of Labor for safety and health training. GFCI Protection for Personnel 1910.304(b)(3)(ii)(A)

Portable GFCI This presentation was created by the N.C. Department of Labor for safety and health training. GFCI Protection for Personnel 1910.304(b)(3)(ii)(A) Note 2 to paragraph (b)(3)(ii)(A) of this section: - Cord sets and devices incorporating the required GFCI that are connected to the receptacle closest to the source of power are acceptable forms of protection This presentation was created by the N.C. Department of Labor for safety and health training. GFCI Protection for Personnel 1910.304(b)(3)(ii)(B) Temporary wiring installations

- Receptacles other than 125 volt, single phase, 15-20 ampere, shall be GFCI protected This presentation was created by the N.C. Department of Labor for safety and health training. Outlet Devices 1910.304(b)(4)(ii)(B) A receptacle shall not be over loaded: - As specified in table S-4 NCDOL Photo Library

This presentation was created by the N.C. Department of Labor for safety and health training. Outlet Devices 1910.304(b)(4)(ii)(B) Safety factor of 20% TABLE S4 Maximum Cord- and Plug- Connected Load to Receptacle Circuit rating Receptacle rating (amperes) (amperes) Maximum load

(amperes) 15 or 20 20 30 12 16 24 15 20 30 This presentation was created by the N.C. Department of Labor for safety and health training.

Grounding Connections 1910.304(g)(4) A grounding electrode conductor shall be used This presentation was created by the N.C. Department of Labor for safety and health training. Grounding Path 1910.304(g)(5) Path to ground from circuits

- Permanent - Continuous, and - Effective This presentation was created by the N.C. Department of Labor for safety and health training. Grounding Path 1910.304(g)(6)(iii) Frames of electric ranges Wall-mounted ovens Counter-mounted cooking units Clothes dryers Metal outlet or junction boxes

that are part of the circuit for these appliances shall be grounded This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Methods, Components, and Equipment 1910.305(b)(1) Cabinets, boxes, and fittings - Conductors entering boxes, cabinets, or fittings shall be

protected from abrasion - Openings through which conductors enter shall be effectively closed - Each cable shall be secured This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Methods, Components, and Equipment 1910.305(e)(1) Enclosures for damp locations shall be installed

so as to prevent moisture or water from entering and accumulating This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Methods, Components, and Equipment 1910.305(g)(1)(ii) Flexible cords and cables can be used for: - Pendants - Wiring of fixtures - Connection of portable lamps or appliances - Portable and mobile signs

- Elevator cables - Wiring of cranes and hoists - Connection of stationary equipment - Prevention of transmission of noise or vibration - Appliances where the fastening means and mechanical connections are designed for maintenance or repair This presentation was created by the N.C. Department of Labor for safety and health training. - Data processing cables Wiring Methods, Components, and Equipment 1910.305(g)(1)(ii)

Can you use an extension cord for this? This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Methods, Components, and 1910.305(g)(1)(iv)(B) Equipment Flexible cords and cables may not be used when run through holes in walls, ceilings or floors This presentation was created by the N.C. Department of Labor for safety and health training.

Wiring Methods, Components, and Equipment 1910.305(g)(2)(iii) Flexible cords and cables must be connected to devices and fittings - Strain relief must be provided to prevent pull from being directly transmitted to joints or terminal screws This presentation was created by the N.C. Department of Labor for safety and health training. Wiring Methods, Components, and

Equipment 1910.305(j)(2)(iv) Wet or damp locations - A receptacle installed in a wet or damp location shall be suitable for the location This presentation was created by the N.C. Department of Labor for safety and health training. Summary In this course, we discussed the following: Common electrical hazards

Electrical utilization systems General requirements Wiring design and protection Wiring methods, components, and equipment for general use This presentation was created by the N.C. Department of Labor for safety and health training. Thank You For Attending! Final Questions? This presentation was created by the N.C. Department of Labor for safety and health training.

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