Double wire under lug

Merry Christmas
Status
Not open for further replies.
storeytime

storeytime

Member
Location
Texas
Is there any place in the code other than 110.14(A) or 408.41 that talks about not putting more than one wire under a lug unless it is clearly marked to accept more than one wire?
 
storeytime said:
Is there any place in the code other than 110.14(A) or 408.41 that talks about not putting more than one wire under a lug unless it is clearly marked to accept more than one wire?
Click to expand...
I am curious as to why you want to know more places for non compliance. Obviously it only needs to be in one place to make it unacceptable-- art 110.14(A).
 
Even though it is forbidden by code, conductors are often "double lugged" by manufacturers. And yes, sometimes it's even done by electricians. *gasp* I don't condone the practice, but I have not seen any problems from double lugging (or more), such as an RTU where there may be 6 factory conductors of all different sizes under one lug.
 
Dennis Alwon said:
I am curious as to why you want to know more places for non compliance. Obviously it only needs to be in one place to make it unacceptable-- art 110.14(A).
Click to expand...

Long story made short. Customer calls us after a job is done by someone else. Wants us to give a bid on another job. We notice wires in the gutter from the first job double lugged. They were in a 1 in 1 out terminal block. This concerns customer. He asks us if we can show him something in the code so he can show his boss. I've always made it a practice not to double lug and have always been taught that, but I've never really know where the code prohibited it. So in my search, I found two articles. I was just calling on experience of others to see if there was any other places that the code might mention this. This is one of the most common code violations we see in this area. Especially tapping off of the main lugs in panels to feed sub-panels. Just wanted to be sure I had my facts right. Thanks for the replies.
 
celtic said:
Are manufac.s covered by the NEC?
Click to expand...

Ha! :grin: I don't see how some get a UL listing, let alone NEC compliant.:-?

I'm sorry. Too harsh??:smile:

Edit: Oh, wait, are you asking if manufac. accountable to install?
 
control panel

control panel

cody, I believe the answer would be that if the "daisy chain" was part of the control panel wiring it would be covered by the listing and labeling of the panel and the approprtiate panel building code, not NEC. If your connections are being daisy chained, the key would be if the terrminal blocks or termination points were rated for such connections.
 
Since we have moved to control panels, what about a Wye start Delta run contactor set up for motor starting?
 
wye-delta

wye-delta

John Valdes said:
Since we have moved to control panels, what about a Wye start Delta run contactor set up for motor starting?
Click to expand...

the question being ???
 
360Youth said:
Ha! :grin: I don't see how some get a UL listing, let alone NEC compliant.:-?

I'm sorry. Too harsh??:smile:

Edit: Oh, wait, are you asking if manufac. accountable to install?
Click to expand...


Manufacturers follow different standards than the "field installer" does. They also have factory testing in conjunction with a testing agency if the product is going to be listed. The testing will test the product with the "multiple" terminations to make sure those terminations are properly made (factory controlled). Hence we see installations within equipment that we in the field ("field installaer") are not permitted to perform. In the field the installations practices cannot be controlled and therefore there are more restrictions.
 
augie47 said:
the question being ???
Click to expand...

To wire a wye start / delta run contactor configuration, you must put two wires under one terminal on two of the three contactors. I wire these myself. It is not performed by the factory. What factory. Everywhere I have ever worked we drew our own schematics and built the control panels ourselves.
Now, you can buy a pre-wired wye/delta contact arrangement at a steep cost. It"s more cost effective to just buy the three contactors and one overload relay and connect them yourself.
 
Nothing is wrong with "daisy chaining". How would you connect all the "so called neutral" conductors in a control panel? How would you apply line power to the contactors? WITH JUMPERS, from contactor to contactor. What about control xfmr's. The primary has to come from somewhere.
Now you could install a terminal block for this purpose, but why?

No NEC requirment in this example.
 
Status
Not open for further replies.
Top