ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Questioning the electrical norms
by HotLine1 - 03/04/21 12:35 PM
Lock-down Thread
by gfretwell - 03/03/21 12:38 PM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 13 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Are these "portable load centers" legal to code? #189774 10/25/09 01:56 AM
Joined: Jan 2005
Posts: 14
zorinlynx Offline OP
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 Files thesethings.jpg
Last edited by zorinlynx; 10/25/09 01:58 AM.
Tools for Electricians:
Re: Are these "portable load centers" legal to code? [Re: zorinlynx] #189775 10/25/09 02:30 AM
Joined: Mar 2007
Posts: 404
noderaser Offline
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.

Re: Are these "portable load centers" legal to code? [Re: noderaser] #189777 10/25/09 09:46 AM
Joined: Jul 2004
Posts: 783
LarryC Offline
Since these things are by default used in temporary power aplications, does the NEC even apply?

Re: Are these "portable load centers" legal to code? [Re: LarryC] #189778 10/25/09 10:19 AM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
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.

Re: Are these "portable load centers" legal to code? [Re: renosteinke] #189779 10/25/09 10:30 AM
Joined: Aug 2007
Posts: 853
leland Offline
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.

Re: Are these "portable load centers" legal to cod [Re: LarryC] #189780 10/25/09 10:42 AM
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.
Re: Are these "portable load centers" legal to cod [Re: Tom] #189784 10/25/09 12:06 PM
Joined: Apr 2003
Posts: 362
Obsaleet Offline
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.
Re: Are these "portable load centers" legal to cod [Re: Obsaleet] #189785 10/25/09 12:30 PM
Joined: Jul 2004
Posts: 9,571
gfretwell Offline
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
Re: Are these "portable load centers" legal to cod [Re: gfretwell] #189787 10/25/09 01:46 PM
Joined: Jan 2002
Posts: 69
waymag Offline
Not one GFCI. That is the problem I am having. Is it just sitting on the floor??? What is wrong with these folks?

Re: Are these "portable load centers" legal to cod [Re: waymag] #189790 10/25/09 03:52 PM
Joined: Feb 2002
Posts: 183
n1ist Offline
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 :-)

Page 1 of 2 1 2


2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
lil suzi
lil suzi
Posts: 57
Joined: August 2003
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
275,722 Are you busy
209,640 Re: Forum
196,985 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3