New Service Panel Question

jparrie · May 18, 2008

I'm installing a new 200A Service panel while remodeling. This unit has 42 slots, but there is no way that there are enough knockouts for even half that many cicuits. Does the NEC alow doubling or even tippling up on the nm romex through each knockout opening? Secure them all to framing within 8" of the service? Any derating required?

TIA

Speedy Petey · May 18, 2008

jparrie said:
Does the NEC alow doubling or even tippling up on the nm romex through each knockout opening? Yes. It depends on the rating of the connector. Most allow at least two cables.

Secure them all to framing within 8" of the service? 12" is code.

Any derating required? No.

This message was too short so I made this white.

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jparrie · May 18, 2008

Speedy Petey said:
Yes. It depends on the rating of the connector. Most allow at least two cables.

Thanks! Can you point me to a source for this connector rating information?

Chris75 · May 18, 2008

This is for Arlington NM connectors only.

http://www.aifittings.com/c_19.htm

Speedy Petey · May 18, 2008

Pretty much every NM connector that looks like that will accept at least two cables of varying sizes.

You have to look at the label or instructions.

Marv · May 19, 2008

Two wires in every hole (12 & 14 gauge). In our county we can use the yellow or grey plastic fittings. Very easy to use.

jparrie · May 19, 2008

Marv said:
Two wires in every hole (12 & 14 gauge). In our county we can use the yellow or grey plastic fittings. Very easy to use.

I'm not familar with those, who makes them?

Marv · May 21, 2008

I'm not sure who makes them, just go to home depot and look for the plastic inserts by the metal connectors. They're fast and quick and hold the wire great.

Chris75 · May 21, 2008

Marv said:
I'm not sure who makes them, just go to home depot and look for the plastic inserts by the metal connectors. They're fast and quick and hold the wire great.

Are you talking about these

or these

Marv · May 22, 2008

I've used the second one. I've also used the yellow ones that are similar (and the yellow with double inputs).

KD · May 27, 2008

If your inspector allows you to use grommets they must be stapled within 8 inches of the box. Some allow lots of cables going thru one big grommet. Others say one cable--one hole.

Chris75 · May 27, 2008

ked said:
If your inspector allows you to use grommets they must be stapled within 8 inches of the box. Some allow lots of cables going thru one big grommet. Others say one cable--one hole.

Its a code violation to just use a grommet... even if you do staple within 8" of the box...

Speedy Petey · May 27, 2008

ked said:
Others say one cable--one hole.

Also, "others" CANNOT simply say that. They must be able to back it up with a written code citation, which in this case they probably could not do.
MOST NM connectors ARE rated for more than one cable.

New Service Panel Question

jparrie

Automotive Locksmith

Speedy Petey

Licensed Electrical Contractor

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jparrie

Automotive Locksmith

Chris75

Electrician

Speedy Petey

Licensed Electrical Contractor

Marv

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jparrie

Automotive Locksmith

Marv

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Chris75

Electrician

Marv

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KD

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Chris75

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Speedy Petey

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