Question, a 3000A fuse feed a 4000A busway, then use busway reducer, change busway to 3000A. it is feeding meter bank. Do I need fused reducer or non-fuse reducer?
I try to use 4000A busway for reduce the voltage drop, it is a long run.
I am in nyc, therefore i use 2008 nec code. Per 368.17 (b) I need a overcurrent protection, but 3000A busway still protect by 3000A fuse. even if I add a fuse reducer, it will still be 3000A fuse.
Do I need fuse reducer or non-fuse reducer?
Per 368.17 (b)
(B) Reduction in Ampacity Size of Busway. Overcurrent
protection shall be required where busways are reduced in
ampacity.
Exception: For industrial establishments only, omission of overcurrent
protection shall be permitted at points where busways are reduced in
ampacity, provided that the length of the busway having the smaller
ampacity does not exceed 15 m (50 ft) and has an ampacity at least
equal to one-third the rating or setting of the overcurrent device next
back on the line, and provided that such busway is free from contact
with combustible material.
I try to use 4000A busway for reduce the voltage drop, it is a long run.
I am in nyc, therefore i use 2008 nec code. Per 368.17 (b) I need a overcurrent protection, but 3000A busway still protect by 3000A fuse. even if I add a fuse reducer, it will still be 3000A fuse.
Do I need fuse reducer or non-fuse reducer?
Per 368.17 (b)
(B) Reduction in Ampacity Size of Busway. Overcurrent
protection shall be required where busways are reduced in
ampacity.
Exception: For industrial establishments only, omission of overcurrent
protection shall be permitted at points where busways are reduced in
ampacity, provided that the length of the busway having the smaller
ampacity does not exceed 15 m (50 ft) and has an ampacity at least
equal to one-third the rating or setting of the overcurrent device next
back on the line, and provided that such busway is free from contact
with combustible material.
