Don't really have a question, just never seen one of these until today. Thought I would share.
800A, 120/240V single phase. Parallel fuses clips with 400A fuses.
I've also seen it done when vertical space was limited. 400A fuses are a lot shorter than 800A fuses. An 800A Fused switch would take up an entire bay height, a 400A switch would not.This was the norm for large services and FSS (fused safety switches) in pre-800 and larger fuses. Can't tell you when this type of installation ended.
It looks to me that each phase is in it's own conduit?
It looks to me that each phase is in it's own conduit?
Yep. A guy I work with noticed that right off too.
The service entrance conductors are A-B-N in each pipe into a CT cabinet just to the left of this switch. The installer nippled between the CT cabinet and the disconnect and grouped them A-A-N and B-B-N through the nipples.
My co-worker, pardon me for this, felt the nipples to see if they were warm. From magnetic inductance of course. They were not.
My co-worker, pardon me for this, felt the nipples to see if they were warm. From magnetic inductance of course. They were not.
Leaving the nipple piercing analogies aside for the moment, is it code to have the two parallel neutrals running through different nipples? (If they are in fact parallel.)The installer nippled between the CT cabinet and the disconnect and grouped them A-A-N and B-B-N through the nipples.
Leaving the nipple piercing analogies aside for the moment, is it code to have the two parallel neutrals running through different nipples? (If they are in fact parallel.)