Wood inside of a junction box

[tom baker]

That's a gutter .

Auxiliary gutters are much less common than a wireway. Please see definitions for each

 

[Shaneyj]

Hoffman offers plywood back panels. Just saying.


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[augie47]

Hoffman offers plywood back panels. Just saying.


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I've seen those used for mounting telephone blocks but never for power and definitely not as insulating material.

 

[tom baker]

Hoffman offers plywood back panels. Just saying.


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Augie was ahead of me on this. Common for telephone. Back in the day I would look in the Hoffman catalog to see about the details and listing data, but no more catalogs for me.

 

[jmellc]

I have seen plywood backboards in CT cabinets.

 

[hillbilly1]

They do make “Fire rated” plywood, it is used for backboards in telecommunications equipment rooms, but haven’t seen any rated for voltage!

 

[augie47]

Hoffman ATC24246F Telephone Cabinet, Type 1

Hoffman ATC24246F Telephone Cabinet, Type 1 Indoor 24" x 24" x 6" (HxWxD) Steel Enclosure. Wall Mount Painted Steel with Tumbler lock Latch latch Continuous Hinge.

rspsupply.com

note description states: "includes wood backplate"

 

[ggunn]

I have seen three phase utility CT cabinets with wooden backplates.

 

[tom baker]

There is a difference between a wireway which does not come with the wood back option and a CT can which may have. The issue is that the terminal blocks inside the wire we are required to have insulating covers as pointed out in the second post.
I don’t know if a CT can with a wood backboard is allowed by the NEC, as often the CT scan requirements are dictated by the power utility.

 

[James L]

I used plywood as a back plate in a CT cabinet 10 years ago. It passed inspection, no problemo

 

[electrofelon]

Right but having wood in an electrical box or wireway, and attaching live electrical parts to wood in an electrical box or totally different things.

 

[macmikeman]

Auxiliary gutters are much less common than a wireway. Please see definitions for each

Now where will I find that, it's not in article 100 of the NEC.............. I checked....

 

[electrofelon]

Now where will I find that, it's not in article 100 of the NEC.............. I checked....

They have their own article, 366. I will defend your use of the word "gutter" because that is common jargon for a wireway and usually not meant to refer to an actual "auxiliary gutter". Just like when we say THHN, we typically don't mean actual THHN that is dry location only.

 

[tom baker]

Agreed. But Mike Holt once said “definitions are important, they tell us what rules to apply”.

 

[macmikeman]

But I didn't say Auxillary . Not even once. Wanna know what else? I've read Chapter 3 at least 500 times over, since I got done with Vocational school back in 1976. If I meant " Auxillary Gutter", I would have said that. But I meant what I said cause that is the name which I can always buy that exact "thingamajig" showing in the picture at the wholesale houses, both here and in several cities in Florida I have worked in. I ask for a gutter and I get a " Wireway". Sometimes I ask for Romex and I get NM cable. But calling a six foot by 24" Gutter a junction box is something an electrical engineer might do, but just about never an electrician. Anyway, that picture is going to ruin my Alaska vacation now that I know how they splice things up there.........