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Joined: Jan 2005
Posts: 14
Hello folks.

I was at a video game convention recently and came across these portable "mega power strips", for lack of a better term. It looks like a subpanel with a bunch of outlet boxes attached, connected to a three-phase 120/208 outlet.

I'm just wondering if these things are legal. I've seen many photos of "home-made power strips" that use outlet boxes derided in the violation forum, and got curious when I saw these being used to provide power at the convention center.

The photo is attached; hopefully it comes through okay.

Attached Images
Last edited by zorinlynx; 10/25/09 02:58 AM.
Joined: Mar 2007
Posts: 404
Looks pretty dodgy; most production/expo companies would use spider-boxes or other purpose-built, UL-listed distro equipment. Boxes like that are subjected to a lot of physical abuse.

Joined: Jul 2004
Posts: 787
Since these things are by default used in temporary power aplications, does the NEC even apply?

Joined: Jan 2005
Posts: 5,445
Likes: 3
Cat Servant
"Seems pretty dodgy."

Sure, and I've seen the rants against the extension cords with boxes mounted on the ends of them, with (at the minimum) the assertion that pendant rules apply.

Another maven of the seminar crowd recently crowed that 'changes' to OSHA rules pertty much ban the use of anything home-built where there is a listed product manufacturered. (Alas, he used the entire CFR as his citation, so I have yet to find the 'change' he was referencing.)

Balderdash! Since when did we make individual effort illegal? Maybe stick-built homes will be banned next, as there are many fine 'manufactured and UL-listed" homes available!

Just because something is site-made does not mean it's automatically wrong.

I applaud the guy's effort at making his own 'spider box.' Please note that most 'factory' boxes have far fewer receptacles, and use twist-lock types instead. This guy has the bases covered: support, over-current protection, strain relief, etc.

While I might have done it differently, those are differences in design only.

Let's face it: despite the tremendous range of products available commercially, there are still situations where the factory-,ade products are lacking. Perhaps the most obvious is the lack of space; plug in one 'wall wart,' and you've taken several receptacles out of service. That just might be why there are so many receptacles on this board.

If - and it's a big if - one were to find fault with this product, it would be the lack of GFCI protection. That is an issue that can be readily addressed just by replacing a few receptacles.

Joined: Aug 2007
Posts: 853
At the college where i used to work we made several of these,a bit more professional looking.

We used 100A main breaker 3 ph. mounted to 2 wheel dollies. used them at all the various functions around campus,all GFI.
We had various spots with 100 pin/sleeve rec to power them.

This made function set up a snap.

Joined: Jan 2001
Posts: 1,044
Tom Offline
The NEC does cover temporary installations. From what I can see in the picture, there is only one fairly minor violation, disconnecting means are not labeled as to what receptacles they serve.

Few things are harder to put up with than the annoyance of a good example.
Joined: Apr 2003
Posts: 362
I have one of these in my garage. I use for a disaster restoration company I work for. I use all the time as temp power after fires. Most fires do not damage the service so we are able to plug into the range with it and give them the power they need. Many time 5 or 6 dryers and fans. I have set it up so it can be madified to be used as a temp service. Have not had an inspector fail it yet.

Choose your customers, don't let them choose you.
Joined: Jul 2004
Posts: 9,931
Likes: 34
I think I would pull out 590 and 525 to see which applied to the subject installation ... if I was actually in a position to inspect it at all. Usually these things are just the source of some interesting pictures for a "building" inspector. The life safety officers or fire marshals may be able to step in but the building department is not involved unless there is a permit pulled.

Maybe 525.22? 23?

Greg Fretwell
Joined: Jan 2002
Posts: 70
Not one GFCI. That is the problem I am having. Is it just sitting on the floor??? What is wrong with these folks?

Joined: Feb 2002
Posts: 183
I'm wondering how they ran the wire between the boxes and the panel... I'm betting they are just going thru open KOs. At least they cater to both the ground up and ground down (and sideways) people :-)

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