NM Wire Through Conduit

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fifty60

fifty60

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USA
I need to run 8awg/4conductor through approximately 20 feet of rigid conduit. I know I cannot run 8/4 SOOW cable through conduit, so I am trying to figure out what cable I will need. 3 of the conductors are line, and the 4th conductor is ground, so it can be 10AWG for the ground.

Would I be looking for 8/4 NM cable? Or is there some other designation cable I should be looking for?
 
fifty60 said:
I need to run 8awg/4conductor through approximately 20 feet of rigid conduit.
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Are you assembling the RMC as a "raceway" or as a sleeve used for physical protection?

See Chapter 9, Table 1, Notes to Tables (2) & (10).
 
fifty60 said:
I need to run 8awg/4conductor through approximately 20 feet of rigid conduit. I know I cannot run 8/4 SOOW cable through conduit, so I am trying to figure out what cable I will need. 3 of the conductors are line, and the 4th conductor is ground, so it can be 10AWG for the ground.

Would I be looking for 8/4 NM cable? Or is there some other designation cable I should be looking for?
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I'm seeing a lack of knowing the difference between a cable and a cord. Happens all the time.

SOOW is a cord.

NM-B is a cable.

Cords include the ground in the number. Cables do not.

8/4 SOOW cord has the same number of wires inside as 8/3 NM-B w/ground.

As noted, more information is needed for the rest of the question.
 
1000+ posts, consisting of 1000+ questions....

I agree, this kind of question should be for trained Electrician to figure out, and it normally is, but I am being insisted on ordering the cable. So I am going to order it, oversize it a little bit, and then put warnings that all derating factors must be considered before using the cable, and that potentially a larger cable will need to be used.

That being said, I have ordered many SOOW cords, and know not to run them inside conduit. I've oddly enough never had to purchase the NM-B cable, but I am going in this instance.

The cable is being ran between 2 machines, and may not even be put inside a conduit for all that I know. I am assuming that it is...if it is not ran inside a conduit, am I able to still use the NM-B cable, or should I use something like an SOOW at that point?
 
fifty60 said:
The cable is being ran between 2 machines, and may not even be put inside a conduit for all that I know. I am assuming that it is...if it is not ran inside a conduit, am I able to still use the NM-B cable, or should I use something like an SOOW at that point?
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Knowledge of the location of the "2 machines" is required to answer the question. NMB and SOOW are apples and oranges. . . i.e., not the same thing, at all.

Are the machines exposed to weather, in a normally dry location, in a damp location? Does the wiring between the two machines require physical protection? Commercial, industrial, residential, agricultural?

Intuitively it seems that NMB would be a less likely choice, but I can't tell without knowing the actual nature of the installation.
 
It is indoors, in a manufacturing facility. No problems with leaky ceilings in this location, that I am aware of. So indoor, dry, manufacturing facility, running around 30 feet. The cable is bring power from one machine to another machine...
 
fifty60 said:
It is indoors, in a manufacturing facility. No problems with leaky ceilings in this location, that I am aware of. So indoor, dry, manufacturing facility, running around 30 feet. The cable is bringing power from one machine to another machine...
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What are the processes, are there hydraulic fluid / lubricants to worry about? Are personnel or wheeled machines going to walk / roll over the cable / cord, or get against it if it is on a wall? Are the machines to move regularly or are they fixed in place? Is this wiring to be fixed to a surface like a wall or floor? Are the two machines linked together by sub assemblies (that could be a route for the wiring) or are they unrelated to each other?
 
There are a lot of hydraulics and other fluids in the area, but should only ever spray if something goes wrong. There is some black build up on the walls, etc, so overall there is some pollution in the air, but probably not an issue for any cables. It is a fixed installation, no one should be walking or driving on the cables. The cables will likely be routed through some of the infrastructures around the machines. At the end of the day, i don't know if they are going to run the cable inside a conduit, or freely through the air. I would like to find a cable solution that would work for either situation.
 
fifty60 said:
There are a lot of hydraulics and other fluids in the area, but should only ever spray if something goes wrong. There is some black build up on the walls, etc, so overall there is some pollution in the air, but probably not an issue for any cables. It is a fixed installation, no one should be walking or driving on the cables. The cables will likely be routed through some of the infrastructures around the machines. At the end of the day, i don't know if they are going to run the cable inside a conduit, or freely through the air. I would like to find a cable solution that would work for either situation.
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What about TC?
 
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