Voltage Drop Across a Breaker

[Rusty123]

In my opinion, this thread illustrates the advantage of connecting the house bank to a distribution bus(ses) (via a proper fuse), and then connecting loads (and charging sources) to the bus. Simplifies issues of OCP, bank balancing, wire clutter, etc.

[roland stockham]

Originally Posted by btrayfors

If you're going to use AWG6 wire and connect directly to the house bank, be very careful of the type of fuse or breaker you choose. To be ABYC compliant, you must use one of three types of fuses:

ANL, MRBF, or Class-T

The MAXI fuses and "standard automotive fuses" are NOT appropriate, as they do not have a high enough ampere interrupt capacity (AIC) to be used in this way.

The above-referenced breaker is the only one readily available now which has a high enough AIC to connect directly to the house bank, i.e., at least 5,000 amperes.

Devices without sufficiently high AIC can fail in a shorted condition, causing a direct short and, possibly, a fire. That's the reason for the standard.

FWIW,

Bill

y reading of ABYC is that only one fuse at this standard is required so if you run main brakers or fuses directly off the man bank an then treat that as the main power stud it is fine to use automotive panels on secondary distribution panels which makes them cheaper an smaller.

[jonahmulski]

Originally Posted by btrayfors

The above-referenced breaker is the only one readily available now which has a high enough AIC to connect directly to the house bank, i.e., at least 5,000 amperes.

This is good to know, thanks. I'll look into the standards before moving forward.
At this point I'm moving in the breaker direction. The data sheet for the breakers that fit into my panel rates the interrupting capacity for the 30 amp breaker at 1000 amps at 50VDC. Unfortunately, they don't give me the capacity at 12VDC. I'll have to give them a call.

[Zil]

The interrupt amperes would be higher for lower voltage and lower for higher voltage.