polarized plug

polarized plug

[′pō·lə‚rīzd ′pləg]
(electricity)
A plug that can be inserted in its receptacle only when in a predetermined position.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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When used with a polarized plug, these outlets provide protection by keeping electrical current directed.
Always use a polarized plug for a lamp, extension cord or any other cord that's polarized to begin with.
Individually, a lamp module that controls one incandescent lamp sells for $14.95, a two-prong polarized plug that controls appliances and non-incandescent lamps sells for $16.95, a three-prong grounded plug that controls appliances and non-incandescent lamps sells for $16.95, a wall switch/dimmer that controls a light from one location for $14.95, a three-way wall switch/dimmer that controls a light from two locations sells for $19.95, a key chain remote that controls up to two sets of lights from outside within a 75-foot range sells for $12.95.
Each string has a regular two-prong polarized plug at one end, 15 or 25 C-7 or C-9 lights, and a receptacle plug at the other end so another set can be added in line.
A low center of gravity provides stability, a finger-proof mesh grille covers the heater, and a high-temperature safety shut-offend polarized plug make the unit safer for everyone in the household.
Note: Connect an in-line switch only to a cord with a polarized plug. A polarized plug has one prong wider than other so you can only insert it one way into an outlet.
It also has many safety features, including a tip-over safety switch, built-in handle, 8-foot cord with polarized plug, and heavy-duty legs.
The Code allows an exception to the polarized plug rule if the device is "double insulated." For these devices, manufacturers encase the electrically conductive metal parts, like the motor and wire connections, in an extra insulating layer.
These polarized plugs are available with 28 AWG or 30 AWG wire with 20, 40 or 60 contacts.
With polarized plugs, one blade is wider than the other.
polarized plugs, three-wire circuits with the grounding wire and plug, and ground fault circuit interrupters.
If the fluorescent lights come with polarized plugs (one prong wider than the other), be sure to buy a suitable extension cord.