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In the first part of the question there will be only one wire in the conduit, in the second part of the question there will be two wires in the conduit.

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โˆ™ 2011-01-22 17:54:20
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Q: What is the difference between one current carrying conductor in a conduit and a hot and switch leg in a conduit?
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Can you have only one current carrying conductor in a conduit?

You can have only one current carrying conductor in a conduit, but that conduit must have a slot to relieve the eddy currents that will be created by the transformer effect created by the conductor. It is better to run the neutral or opposite conductor along with the hot conductor together in the same conduit, or through the same penetration, so as to minimize this effect.

Does the Nec allow grounding electrode conductor to be run in conduit that has other conductors in the conduit and what code section?

No, the bare copper grounding conductor can not be in a conduit with other conductors. It can be in conduit by itself to provide mechanical protection for the wire.

What is the difference between thhn and romex?

THHN Is used in conduit, Romex is not.

Does the metal conduit count as a ground?

No, each conduit must contain a separate grounding conductor.

What is the difference between conduit pipe and seamless pipe?

Conduit pipe is for wire. Seamless pipe means you need a coupling to connect them.

Whats the difference between plumbing pipe threads and conduit pipe threads?

Plumbing pipe threads are squared and conduit pipe threads are tapered.

What is difference between cleat and conduit wiring?

Cleat wiring is exposed while in conduit wiring the wires are well protected inside tubes/pipes.

What are synonyms of conductor?

transmitter, wire, channel, conduit, director, pilot

The calculation used to determine amperage of a conductor based on the total number of conductors in a conduit is called A derating B voltage drop C conduit fill D conductor fill?


What does aduequct mean?

Perhaps you mean "aqueduct" a conduit for carrying water.

How many current carrying conductors are you allowed to install in a conduit before you derate?

You can put three ccc's in a conduit (any size conduit) before you derate. Keep in mind that for single phase loads (lighting, receptacles) the neutral is also counted as a current carrying conductor. This derating factor does not apply to nipples 24 inches long or less. See NEC Table 310.15(B)(2)(a) for full details on derating regarding ccc's.

What size conduit for 400amps?

The sizing of conduit systems that wire has to be pulled into is dependant on the physical size of the conductor being drawn into the conduit. The second governing factor is the conductor count of the specific conductor that is needed. A 500 MCM copper conductor with an insulation factor of 90 degrees C is rated at 430 amps. This is where the conductor count is need by the service, as to whether the service is single or three phase. In this specific case, the electrical code will allow both single and three phase installations to use the same size conduit. A maximum total of four 500 MCM conductors can be drawn into a 78 mm diameter conduit.

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