PaulKraemer
Electrical
- Jan 13, 2012
- 152
Hi,
I am designing a control panel for machine control. I will be including a disconnect to which a supply power circuit (208 VAC 3 phase 80 amps) will be wired to. When the disconnect is turned on, 208 VAC will be distributed to the following components:
[ol 1]
[li]transformer (208 VAC to 120 VAC)[/li]
[li]two variable frequency drives[/li]
[li]three solid state power controllers for resistance heaters[/li]
[li]one 24 VDC power supply[/li]
[/ol]
I am going to include dedicated branch fuses for all of the above components. What I am unsure of is whether I should also include "Main" 80 amp fuses between the disconnect and my branch fuses. If anyone here can offer an opinion as to whether "Main" 80 amp fuses are recommended (either for code or other reasons), or if they are unnecessary, I would greatly appreciate it. This particular panel will be used in the United States, but I also like to comply with european (CE) and Canadian guidelines as much as I can.
Thanks in advance,
Paul
I am designing a control panel for machine control. I will be including a disconnect to which a supply power circuit (208 VAC 3 phase 80 amps) will be wired to. When the disconnect is turned on, 208 VAC will be distributed to the following components:
[ol 1]
[li]transformer (208 VAC to 120 VAC)[/li]
[li]two variable frequency drives[/li]
[li]three solid state power controllers for resistance heaters[/li]
[li]one 24 VDC power supply[/li]
[/ol]
I am going to include dedicated branch fuses for all of the above components. What I am unsure of is whether I should also include "Main" 80 amp fuses between the disconnect and my branch fuses. If anyone here can offer an opinion as to whether "Main" 80 amp fuses are recommended (either for code or other reasons), or if they are unnecessary, I would greatly appreciate it. This particular panel will be used in the United States, but I also like to comply with european (CE) and Canadian guidelines as much as I can.
Thanks in advance,
Paul