One hole lug on a two hole spade on MVT

[misterpd]

I have a 300 mcm with a one hole lug mounted to the top hole on a two hole spade of the low side of an MVT. That leaves the insulation on the wire next to the spade by the bottom hole.
Looking for thoughts. Okay? If not , why. Thanks.

 

[Jraef]

I have a 300 mcm with a one hole lug mounted to the top hole on a two hole spade of the low side of an MVT. That leaves the insulation on the wire next to the spade by the bottom hole.
Looking for thoughts. Okay? If not , why. Thanks.

In theory, it's fine. There is no difference in potential for the insulation and the tang (what you called the "spade"), so the insulation could be touching for all it mattered. Think about it; the insulation is ALREADY touching the conductor, right?

But keep this in mind; often times the equipment mfr will use a two-hole tang on a termination because the phases are on the verge of being too close to each other. A two-hole lug prevents rotation. Using a one-hole lug means that when you tighten the bolt, you might rotate that lug, even a tiny amount, into the air space of an adjacent phase and violate the dielectric spacing requirements.

 

[petersonra]

good reason to put heat shrink on any exposed surfaces of the lugs.