Electrical Wiring: Safety, Branch Circuits, and Outlet Requirements, Slides of Applied Mechanics

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Electrical Wiring

WIRING BASICS

STANDARDS FOR SAFETY

• National Electrical Code
• Local Electrical Code
• Power Company Requirements
• Underwriters Laboratory (UL)

LOCAL ELECTRICAL CODES

• Local authorities may adopt NEC
• May adopt NEC with modifications
• Local wiring permits and inspections

POWER COMPANY REQUIREMENTS

BRANCH CIRCUITS

• Definition of circuit
• Definition of branch circuit

BRANCH CIRCUITS IN A RESIDENCE

• Individual Circuit
• Small Appliance Circuit
• Laundry Circuit
• Bathroom Circuit
• General Purpose Circuit

SMALL APPLIANCE CIRCUIT

• Serves receptacles for small appliance loads
• At least two required by NEC
• Must be 20 ampere circuits
• No lighting outlets
• Cannot serve any other room in house

LAUNDRY CIRCUIT

• Serves only receptacles in laundry room
• At least one required by NEC
• Must be 20 ampere circuit
• May not have lighting outlets
• May not serve outlets in any other room of house

GENERAL PURPOSE CIRCUITS

• Serve all lighting outlets in home
• Serve all receptacles not on one of the other types of circuits
• May be 15 or 20 ampere (20 ampere preferred)
• Allow at least one general purpose circuit for every 500 square feet of floor space in house

Determining the Kind, Number and

Location of Outlets and Switches in

a Wiring System

RECEPTACLE OUTLET

REQUIREMENTS

• No point along the floor line in any wall space may be more than 6 feet from a receptacle in kitchen, family room, dining room, living room, den, sun room, bedroom, recreation room, or similar room
• (Receptacles must be no farther than _____ feet apart.)

RECEPTACLE REQUIREMENTS

• A receptacle must be installed at each kitchen and dining area counter space if the space is wider than 12 inches
• No point along the wall line of a kitchen counter may be more than 24 inches from a receptacle
• (Receptacles must be no farther than _____ inches apart)

RECEPTACLE REQUIREMENTS

• At least one outdoor receptacle is required
• All outdoor receptacles must have GFCI protection
• Outdoor receptacles must be installed in waterproof boxes

RECEPTACLE REQUIREMENTS

• At least one receptacle is required in the laundry area
• At least one receptacle is required in a basement. All general use receptacles in an unfinished basement must have GFCI protection