Can multiple single lugs on a secondary side of a transformer, be bolted together?

[RobbieR]

I'm reviewing a field photo from the inside of a transformer. The secondary terminal points have (2) single barrel lugs bolted on top of each other for each phase. Is this allowed? It just doesn't seem right to me, but I can't find anything in the Code to probibit it unless I go to 110.3(B). I don't think these lugs are listed or labeled to be bolted on top of other lugs. I thought that's what mulitple-barrel lugs were for?

 

[tkb]

I wouldn't worry about it.
It is done that way every day and has been since Thomas Edison was a pup.

I don't know of anything that prohibits this practice.

 

[infinity]

As long as the same amount of surface area still maintains contact I don't see a problem. Quite often you have no choice but to stack them.

 

[TimK]

surface area

surface area

I'm reviewing a field photo from the inside of a transformer. The secondary terminal points have (2) single barrel lugs bolted on top of each other for each phase. Is this allowed? It just doesn't seem right to me, but I can't find anything in the Code to probibit it unless I go to 110.3(B). I don't think these lugs are listed or labeled to be bolted on top of other lugs. I thought that's what mulitple-barrel lugs were for?

Brings up a good question though, would the bottem one need twice the surface area in order to carry the ampacitiy of the second one in addition to its own?