Blue Sea Fuse Block and Circuit Breaker

[daverami]

I currently have a Blue Sea fuse block under the hood, separated from the battery by a 100 amp circuit breaker. I want to add another fuse block in the cab. Can I come off the existing circuit breaker for this, or does each block need it's own breaker?

 

[flyingwil]

Are we speaking the 6 or 12 units here, and what's attached?

 

[ntsqd]

If you add up all of the current fuses in the fuse block do they come to less than 100 amps?
If no, then yes, but only up to what is left over. E.G. 55 amps in the current fuse block then you only have another 45 amps capacity.
If yes, then no. You need another breaker.

The odds of you ever drawing full power in all of the circuits at the same time are slim, but this is the safe and conservative approach.

 

[daverami]

They are both the 6 fuse units.

There will be less than 100 amps between the both of them, but I think I will be on the safe side and just get another circuit breaker.

 

[Mike S]

Since the fuses protect the individual circuits, you need to use only one circuit breaker - close to the battery. If both fuse panels share the same line from the battery. If the rating of all the protected circuits is above the CB rating, get a CB with more capacity.