Fix a Lamp Cord. Follow the rules of polarity for a safe fix. Family Handyman. Next Project . Introduction Replacing a damaged plug is easy, but for safety you have to follow proper wiring rules, especially when wiring a polarized plug. A polarized plug has one wide and one narrow blade.
I have a lamp that has a damaged plug. I have a replacement plug, but I'm not sure which wire on the cord should be connected to hot plug and which wire to the neutral plug. I know that the plug had a polarity (it had one large blade and one small blade), but I don't know which wire was the "hot" wire. The cord doesn't have a ground wire.
does polarity matter on lamp cord for light. if so ribbed is what, smooth is what?
How to Tell the Negative on an Electrical Appliance Cord ... The Family Handyman: Fix a Lamp Cord; About the Author. Chris Deziel holds a Bachelor's degree in physics and a Master's degree in Humanities, He has taught science, math and English at the university level, both in his native Canada and in Japan. ...
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Buy a “polarized” replacement plug, that is, one that has a normal prong and a wide one. The neutral line on the lamp cord is the one that’s odd; it’ll have ribbing, a sharp ridge or printing on it. If the cord is translucent, the neutral is silver. The wire that goes to the narrower prong has a smooth, plain surface or is gold in color.
Lamp cords are usually all one color making the standard black-hot, white-neutral guidelines useless for determining polarity. Other methods are therefore used to determine the polarity on a lamp cord. First, check the insulation on the cord wires closely and you will find either a textured bead or a thin colored line running along one wire ...
Clear insulation lamp cord Silver conductor is grounded (neutral), copper conductor is ungrounded (hot). Grounded (neutral) goes to the threaded shell of the lamp and is wired direct without break to the wide blade of a polarized 2 prong plug or in the case of a suspended lamp, to the grounded (neutral) white wire.
In a table lamp or appliance using #16 or #18 parallel zip cord, polarity is as follows: Smooth = hot (live) - goes to NARROW pin on polarized plug.
While some wires will come clearly marked with a plus (positive) or minus (negative) sign, others aren’t quite as clear. For those unmarked wires, you can first try to identify the polarity by looking at physical characteristics like color or texture. If you still aren’t sure, test your wires with a digital multimeter. Then, let there be power!