Electrical Receptacles - Mechanics - Lecture Slides, Slides of Applied Mechanics

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Electrical Receptacles

Standard Duplex Receptacle

• Has two halves for

receiving plugs

• Each half has a long

(neutral) slot

• A short (hot) slot
• A U-shaped grounding

hole

Standard Duplex Receptacle

Wire attachment

• Wires are attached to the receptacle at screw terminals or push-in fittings
• A connecting tab between the screw terminals allows a variety of different wiring configurations
• Receptacles also include mounting straps for attaching to electrical boxes

Standard Duplex Receptacle

Testing Agent’s Approval

• Stamps of approval from testing agencies are found on the front and back of the receptacle
• Look for the symbol UL or UND. LAB. INC.
• Make sure the receptacle meets the strict standards of Underwriters Laboratories

Standard Duplex Receptacle

• Those marked CU- CLAD ONLY are used with copper-coated aluminum wire
• Only receptacles marked CO/ALR may be used with solid aluminum wiring
• Receptacles marked AL/CU no longer may be used with aluminum wire

Basic Types of Receptacles

• Several different types of receptacles are

found in the typical home

• Each has a unique arrangement of slots that

accepts only a certain kind of plug, and each

is designed for a specific job.

• Household receptacles provide two types of

voltage

• Normal and
• High voltage

High Voltage Receptacles

• High- voltage receptacles are rated at

220, 240, or 250 volts. These ratings

are considered identical.

• When replacing a receptacle, check the

amperage rating of the circuit at the

main service panel

• Buy a receptacle with the correct

amperage rating

15 amps, 125 volts

• 15 amps, 125 volts
• Polarized two-slot

receptacle is

common in homes

built before 1960

• Slots are different

sizes to accept

polarized plugs

20 amps, 125 volts

• This three-slot grounded receptacle features a special T- shaped slot
• It is installed for use with large appliances or portable tools that require 20 amps of current

15 amps, 250 volts

• This receptacle is used

primarily for window

air conditioners

• It is available as a

single unit

• Or as half of a duplex

receptacle

• With the other half

wired for 125 volts

50 amps, 125/250 volts

• This receptacle is used

for ranges

• The high-voltage

current powers heating

coils

• The 125-volt current

runs clocks and lights

High-voltage Receptacles

• High-voltage receptacles provide current to large appliances like clothes dryers, ranges, water heaters, and air conditioners
• The slot configuration of a high-voltage receptacle will not accept a plug rated for 125 volts

High-voltage Receptacles

• Standard receptacle rated for 250 volts has two incoming hot wires
• No neutral wire
• A grounding wire is pigtailed to the receptacle and to the metal receptacle box.