Calculator by Gerald Newton
Standard Size Calculator
for Fuses and Circuit Breakers

Section 240-6(a)
(Size up or down allowed
for 800 amperes or less.)
(Size down above 800 amperes)
Select Option
(see Note below)
Size Up
Size Down
Enter Amperes

(1) Size down for conductors that are part of a multioutlet branch-circuit supplying receptacles for cord and plug connected portable loads.
(2) Additional fuse sizes of 1, 3, 6, 10, and 601 amperes
are not included.
Fuses can be manufactured to almost any size.