Conduit Connection to Generator

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alex032886

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Overland Park, Kansas
I know that it is great practice to use flexible conduit between the stub up and the generator terminal housing, but I can't find a defined location in the code. I have some generators being installed with ridgid conduit directly connected to the generator on a pre-fabricated shelter & pad. Can anyone point out the article that best explains?

Thanks in advance for you help.
 
There is no code section that requires the use of a flexible connection to a generator.

This is a design issue as well as a best trade pratice.

Remember that the code is a minimum safety standard.

Chris
 
alex032886 said:
I know that it is great practice to use flexible conduit between the stub up and the generator terminal housing, but I can't find a defined location in the code. I have some generators being installed with ridgid conduit directly connected to the generator on a pre-fabricated shelter & pad. Can anyone point out the article that best explains?

Thanks in advance for you help.
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I don't think you're going to find anything that prohibits that type of installation in the NEC. Maybe 110.3.B. Check the installation manual.
Most mfgr's would not approve that installation because of the vibration.
You might try NFPA 110 & 111 also. They apply to the installation of generators.
 
I have seen generators in enclosures that the underground conduits were changed over to liquidtite and then they enter the connection box.

I have also seen the conduits coming out under the generator without any flex with open conductors into the connection box. Just chase nipples.

Is a conduit connection required under an enclosed generator or not.

I am talking about some of the larger generators with base fuel tanks.
 
tkb said:
Is a conduit connection required under an enclosed generator or not.

I am talking about some of the larger generators with base fuel tanks.
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I don't. I cut the conduit just above the slab, slap a terminal adapter and plastic bushing on them and free wire from there. I use nipples with lock nuts and plastic bushings to enter the breaker enclosure. Control conduits and conduits for block heaters and bat chargers I change to LFNC at the slab and continue to their destinations.

I believe that once you unlock and enter the generator enclosure, you are standing in a J-box.
 
iwire said:
I think your nuts. :D
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You sound like my wife.

Can you show me that in the NEC?
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I'm a little busy cooking be birthday dinner(came in a pouch:mad:) but OK.

Enclosure. The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts or to protect the equipment from physical damage.
FPN: See Table 110.20 for examples of enclosure types.
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iwire said:
So if I buy metal shed, drop a generator inside it I can wire the interior with open THHN? :confused:
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I think you can, as long as the metal of the shed meets the minimum thickness requirements.

Where's your cutoff point? How big do you permit a junction box to be before you want to call it something other than a junction box?
 
iwire said:
Boy it still seems odd to me, I guess it falls back to 'approved'.

So in your $250,000 box what wiring method did the factory use for the lights and plugs?
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None.

I'm looking through my old disks. I have pictures of the final install and I'm sure it would even meet your approval.:roll:
 
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