Hello..
There's a feeder supplying several meters..
Lets say theres a 400 amp service switch then goes into a trough and then from that trough conductors are tapped to go through a meter then to the main disconnect for each tap.
What is considered in the 10' length? Everything from the tap to the ocp? Would it be considered from the point of the Tap on the feeder "AND" through the meter, and out of the meter to the first disconnect (ocp)?
I'm thinking so, but checking? And I'm also making sure that the Tap "conductors" have to be rated no less than 1/10 the feeder ocp. The meter doesn't have conductors so I'm thinking it would have to be rated for the ampacity of the tap conductors? And for my head in that 240.21 section where it says that equipment can be between the tap and ocp.
Also, I'm looking through changes to the 2014 and see that tapping a tap is a violation. Looking in the code book I can't locate that.. please point me.
I'm trying to get my "facts" together when talking to a landlord this week.
The actual 400 amp switch feeds a small trough with 500's, from there it's tapped with smaller conductors to another trough that taps to smaller conductors feeding 9 meters to some panels or 2 pole main breakers.
Also from the small 400 amp trough it's tapped again with smaller conductors to feed a trough that has taps to smaller conductors feeding 3 more meters and main breakers (or fuses).
These taps from the 500's to the last meter/disconnects are +- 20' away.
The whole service needs to be redone, it's very old and if you look up you see all the existing floor joists and beams that had been in a major fire years ago. Opening things up they are feeding neutral loads from taps with no neutrals (going to through).. 3 phase motor loads with 2 two wire romex…….. a real mess.. and old.
I keep mentioning to the landlord, I really don't want the liability, but I will fix the whole thing..…….. he keeps saying he wants to fix it all then directs me back to "just" replacing the burnt out older meter..???
So besides the blatant wiring that is wrong (ground as neutral, open splices, 2-2wire as 3 wire….tandems, tandems and more tandems, I'm also trying to get together in my had the tap rule that is not right (and for my personal education.
Thank you..
There's a feeder supplying several meters..
Lets say theres a 400 amp service switch then goes into a trough and then from that trough conductors are tapped to go through a meter then to the main disconnect for each tap.
What is considered in the 10' length? Everything from the tap to the ocp? Would it be considered from the point of the Tap on the feeder "AND" through the meter, and out of the meter to the first disconnect (ocp)?
I'm thinking so, but checking? And I'm also making sure that the Tap "conductors" have to be rated no less than 1/10 the feeder ocp. The meter doesn't have conductors so I'm thinking it would have to be rated for the ampacity of the tap conductors? And for my head in that 240.21 section where it says that equipment can be between the tap and ocp.
Also, I'm looking through changes to the 2014 and see that tapping a tap is a violation. Looking in the code book I can't locate that.. please point me.
I'm trying to get my "facts" together when talking to a landlord this week.
The actual 400 amp switch feeds a small trough with 500's, from there it's tapped with smaller conductors to another trough that taps to smaller conductors feeding 9 meters to some panels or 2 pole main breakers.
Also from the small 400 amp trough it's tapped again with smaller conductors to feed a trough that has taps to smaller conductors feeding 3 more meters and main breakers (or fuses).
These taps from the 500's to the last meter/disconnects are +- 20' away.
The whole service needs to be redone, it's very old and if you look up you see all the existing floor joists and beams that had been in a major fire years ago. Opening things up they are feeding neutral loads from taps with no neutrals (going to through).. 3 phase motor loads with 2 two wire romex…….. a real mess.. and old.
I keep mentioning to the landlord, I really don't want the liability, but I will fix the whole thing..…….. he keeps saying he wants to fix it all then directs me back to "just" replacing the burnt out older meter..???
So besides the blatant wiring that is wrong (ground as neutral, open splices, 2-2wire as 3 wire….tandems, tandems and more tandems, I'm also trying to get together in my had the tap rule that is not right (and for my personal education.
Thank you..