Common use of FUSES Clause in Contracts

FUSES. 1. Fuses for disconnects to be current limiting UL class J, RK1 or RK5 and of the appropriate voltage, delay or non-delay characteristic, and current rating to provide complete short circuit and overload protection per NEC sections regarding component selection. 2. Fuses located in the combiner boxes protecting PV string branch circuits shall be UL listed 600V or 1000V DC rated, be in “finger-safe” type fuse holders providing load break disconnect capabilities when changing fuses. Midget fuses and fuse holders used in these circuits must be fully DC rated and adequate DC short circuit withstands and let-through capability must be provided for all power situations including “back-fed” conditions.