How to Fix an Electrical Plug

By eHow Home & Garden Editor

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A plug with a cracked or broken housing, a missing insulating cover or loose, badly bent prongs may present a fire or shock hazard or both; unplug it immediately and replace it. You might also want to swap a standard plug for one of a different color or a flatter one that takes up less room behind furniture.

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Instructions

Difficulty: Moderately challenging

Things You’ll Need:

Masking Tape And Pen
New Plug And/or Cord
Utility Knife
Standard Screwdriver And/or Nut Driver
Wire Cutters/strippers

Installing a terminal-screw plug

Step1

Assuming that you don't mind losing a little cord length, cut the old plug off with wire cutters rather than trying to disassemble it.

Step2

Open the new plug according to the instructions. Some snap on and off the cord, and others screw together.

Step3

Insert about 6 inches (15 cm) of the cord through the plug's housing.

Step4

For a lamp or flat heater cord, split apart the two wires if they're not already split. Start the cut with a utility knife and then tear 2 inches (5 cm) apart by hand.

Step5

For a round cord, such as those used for some appliances and machinery, strip off the outer insulation. Make a 1-inch (2.5-cm) cut lengthwise at the cord's end; grasp the insulation to tear open about 3 inches (7.5 cm), scoring the surface with a utility knife as needed; and cut off the outer insulation at the top of the tear, being careful not to nick the wire insulation.

Step6

Unless the plug body is equipped with a clamp or another strainrelief connector, tie the two wires together using an Underwriters knot.

Step7

Determine how much wire must be exposed to reach and wrap around the terminal screws, then cut off any excess with wire cutters/strippers.

Step8

Remove 1/2 inch (12 mm) of the wire insulation with wire cutters/ strippers, using the stripper hole that corresponds to the gauge of wire you are stripping.

Step9

Twist the wire strands together and bend them to form a loop, then wrap each loop clockwise under the appropriate terminal screw.

Step10

For an ungrounded (two-prong) plug, attach the white or ribbed wire under the silver terminal screw or to the terminal on the wider prong, and attach the black wire (hot) under the brass terminal screw or to the terminal on the narrower prong.

Step11

When an appliance or tool requires a three-prong grounded plug, connect the grounding wire (green) under the green terminal screw on the grounding prong; attach the black wire (hot) under the brass terminal screw and the white wire (neutral) under the silver terminal screw.

Step12

Tighten any cord clamp or other strain-relief connector.

Installing a quick-connecting flat-cord plug

Step1

To install a quick- or self-connecting flat-wire plug, cut the end of the cord with wire cutters.

Step2

Installation varies. Either open an arm on the plug body, insert the cord and press the arm closed; or pull the terminal block and prong assembly out of the plug shell, feed the cord through the shell and into the terminal block, squeeze the prongs and push the two parts of the plug back together.

Installing a 240-V plug

Step1

Appliances requiring 240 volts utilize cords with molded plugs and pigtails. Unplug the appliance and open the wiring-box cover with a screwdriver or nut driver.

Step2

Write "left," "center" and "right" on short lengths of masking tape and wrap these around the wires to identify the connection points. Remove and save the terminal screws.

Step3

Purchase an identical cord and connect its pigtails under the terminal screws, using the old cord as a guide. Reinstall the wiringbox cover.

Tips & Warnings

Choose a polarized plug for a lamp, or when wiring a nonpolarized plug for one, mark the prong connected to the ribbed wire with a permanent marker. Plug the cord in so the marked prong fits into the receptacle's wide slot.
To make a lamp with a nonpolarized plug safer, determine which prong is connected to the shell, and make sure that prong plugs into the receptacle's wide slot.
The National Electrical Code no longer permits plugs with removable insulating covers that fit over the prongs. Compliant terminal plugs are all wired from the back.
To close the arm fully on some quick-connect plugs, you may need to push it against a hard surface.
Don't replace a plug on a portable tool. Replace the whole cord with one that has a molded plug. Why? Even if a replacement plug could handle the abuse, it's more likely to get caught on work pieces, which might cause an accident.
Always use a grounding plug to replace one of that style, or on an appliance or tool that requires grounding.