e57
Senior Member
- Location
- San Francisco, CA
Situation - need an additional lug on each of the tabs of this 4000A vertical bus on this feeder. Roughly 18 floors from the service, 19 from the transformer - Engineer currently calc'ing the AIC...
Shutting down includes 18 floors of high rise resi, which I am more than happy to do - but will take some doing and coordination... My concern is that the fused switch for it has not opened since 1963 - nor have many of those attached to it down stream. I figure on taking most of the units off individually, knocking down the main - DOING IT - then main back on, then all the units that get taken out first.
Or - suit up and go live - pull one bolt and add one to the back side with just the units on this floor off...
I have no way of assessing the 4000A switch condition without shutting it off....
Shutting down includes 18 floors of high rise resi, which I am more than happy to do - but will take some doing and coordination... My concern is that the fused switch for it has not opened since 1963 - nor have many of those attached to it down stream. I figure on taking most of the units off individually, knocking down the main - DOING IT - then main back on, then all the units that get taken out first.
Or - suit up and go live - pull one bolt and add one to the back side with just the units on this floor off...
I have no way of assessing the 4000A switch condition without shutting it off....