Trumpy:
I see Paul UK beat me to posting the table.
Residential is mostly circuit breakers nowadays. You may see fuses at the central AC condenser IF the mfg spec's FUSES, if not it's a HACR rated CB. There are still some edison (plug) fuses in old homes, and some cartridge fuse main service discos around.
Commercial and industrial lighting and GP circuits are also CB's. Fuses for motors and equipment. Fuses are a preferred OCP where a high AIC rating is required, as the high AIC rated CB's are very pricey.
OCP (overcurrent protection) for cables is based on the NEC; Tables 310-16 to 310-86 of the '99 NEC. If you would like a copy of the tables, e-mail me your address, and I will mail you them.
Hope the above helps
John
