panelboard(3 phase, 208v, 4wire) and OCPD

Status
Not open for further replies.
M

MURALS

Member
Location
SAN FRANCISCO
I have a question:
A 45KVA 3 phase transformer ( 480/208-120) has 70 amp primary protection. 150 amps Secondary breaker size in the panelboard which 3phase, 208/120, 4 wire, 100Amps. The panel is within 10 feet of transformer. Is this OK as per code? I think that the breaker size in the panel should be 100 Amps and not 150 Amps as the Panelboard is rated for 100 amps. Any comments?
Murals:D
 
MURALS said:
I have a question:
A 45KVA 3 phase transformer ( 480/208-120) has 70 amp primary protection. 150 amps Secondary breaker size in the panelboard which 3phase, 208/120, 4 wire, 100Amps. The panel is within 10 feet of transformer. Is this OK as per code? I think that the breaker size in the panel should be 100 Amps and not 150 Amps as the Panelboard is rated for 100 amps. Any comments?
Murals:D
Click to expand...
408.36 requires the panel be protected by an OCPD with a rating that does not exceed that of the panel.
 
Status
Not open for further replies.
Top