For general motor application, the fuse size for the motor branch circuit must be determined from___.

For general motor application, the fuse size for the motor branch circuit must be determined from___.

• A. NEC Tables
• B. NEMA standards
• C. Motor nameplate current
• D. Factory Mutual

Answer: (A)

Sizing the motor branch-circuit fuse is done using NEC tables that translate the motor’s full-load current (from the nameplate) into an appropriate fuse rating, accounting for starting surges and the protection of conductors. The NEC, specifically Article 430, provides these tables and rules for motor circuits, so they are the authoritative source for determining the correct fuse size. The motor's nameplate current is the input data used with the tables, but you don’t pick a fuse by nameplate value alone; you follow the table guidance to select a permissible rating and type. NEMA standards don’t set fuse sizing, and Factory Mutual is not the code basis for this determination.

Sizing the motor branch-circuit fuse is done using NEC tables that translate the motor’s full-load current (from the nameplate) into an appropriate fuse rating, accounting for starting surges and the protection of conductors. The NEC, specifically Article 430, provides these tables and rules for motor circuits, so they are the authoritative source for determining the correct fuse size. The motor's nameplate current is the input data used with the tables, but you don’t pick a fuse by nameplate value alone; you follow the table guidance to select a permissible rating and type. NEMA standards don’t set fuse sizing, and Factory Mutual is not the code basis for this determination.