Everything to bus bars?

[markcouz]

So explain to me again why fuses are required [emoji848]

[Iron E]

Originally Posted by Jammer

Although you dismiss the possibility of a short in the cables from the battery to the inverter, such shorts can and do occur. Among the many possible causes are metal cable clamps that cut into the cable, contact between the + cable and moving parts of the engine (or propshaft0 or exhaust components, and heat damage to the insulation near the connection to the inverter caused by high resistance in the terminals or bolts.

While I haven't experienced this on a boat, I have diagnosed a car fire for an insurance claim that was caused by an ashtray light + being grounded during a radio install.
The installer replaced the 10amp fuse with a 30amp fuse. According to the owner, the dash lights worked fine for about 4 hours... before the fire.

Anyway, the original fuse worked as it was supposed to, and you're right, accidental groundings do happen.

[boatpoker]

Originally Posted by Jammer

The MRBF fuses you plan to install on the battery terminals may not have a sufficient interrupting rating for your situation. Typically they are rated for 10,000 amps. It is likely that your batteries will be capable of delivering more than that, when new and fully charged. You may find that the ABYC requires a minimum 2" spacing between the battery and the fuse and does not permit installations on the battery terminals themselves.

Please provide the ABYC Section in E-11 that specifies a 2" minimum and prohibits MRBF fuses on the terminals themselves. I can't find it.

[GordMay]

According to Blue Sea Systems ➥ http://assets.bluesea.com/files/reso...YCexcerpts.pdf

“The ABYC requirement is for a battery bank fuse is to be within 7 wire inches of the battery bank. The European ISO/RCD (which is law) requires the fuse be within 200mm. 200mm equates to about 7.9”.

Originally Posted by ABYC

“ABYC 11.10.1.1.1. OVERCURRENT PROTECTION DEVICE LOCATION:
Undergrounded conductors shall be provided with overcurrent protection within a distance of seven inches (175 mm) of the point at which the conductor is connected to the source of power measured along the conductor.”

Mounting placement dimensions for a fuse or circuit breaker (7"/40"/72" ABYC rule): 7 inch maximum if the conductor is not housed in a sheath or enclosure in addition to the wire insulation, 40 inch maximum if the conductor is housed in a sheath or enclosure in addition to the wire insulation, 72 inch maximum if the conductor is connected directly to the battery and housed in a sheath or enclosure in addition to the wire insulation.