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Old 05-28-2012, 07:48 PM   #1
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lamp socket


i am wiring a lamp and the screws that hold the wire on the sockets are different ond is brass and one is silver and i dont know if i can hook the wires up a sertin way or???

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Old 05-28-2012, 07:53 PM   #2
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Brass = black wire
Silver = white

Exact same thing as on any outlet or switch.

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Old 05-28-2012, 07:58 PM   #3
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Or if using lamp cord, the ribbed side is the silver.
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Old 05-29-2012, 07:14 AM   #4
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Originally Posted by Jim Port View Post
Or if using lamp cord, the ribbed side is the silver.
Really? I never knew that

I've always used the "marked" (ribbed or writing, etc.) conductor as the positive in DC or the hot in AC.

I guess it doesn't matter too much as long as you do both sides the same, but it's good to now know the standard
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Old 05-29-2012, 07:44 AM   #5
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That is so the screw shell is the neutral and lessens the chance for someone to get shocked. The center tab is the hot.
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Old 05-29-2012, 07:59 AM   #6
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Originally Posted by Macro View Post
Really? I never knew that

I've always used the "marked" (ribbed or writing, etc.) conductor as the positive in DC or the hot in AC.

I guess it doesn't matter too much as long as you do both sides the same, but it's good to now know the standard
200.6 takes you to 402.8 which sends you to 400.22 which says:


400.22 Grounded-Conductor Identification. One conductor
of flexible cords that is intended to be used as a
grounded circuit conductor shall have a continuous marker
that readily distinguishes it from the other conductor or
conductors. The identification shall consist of one of the
methods indicated in 400.22(A) through (F).

(F) Surface Marking. One or more ridges, grooves, or
white stripes located on the exterior of the cord so as to
identify one conductor for cords having insulation on the
individual conductors integral with the jacket.
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Old 05-29-2012, 09:06 AM   #7
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That is so the screw shell is the neutral and lessens the chance for someone to get shocked. The center tab is the hot.
Absolutely. When wiring up a socket with a cord that already had a plug on it, I would do a continuity test to find out which wire was attached to the small prong on the plug, I would never go by the markings on the wire alone. When wiring up both the lamp socket and the plug end myself, I would wire the marked conductor as the hot. I guess this just comes from experience with speaker wires and other things like that.

It's good to know that there is a standard

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