For a device of 700W or less, a 3A fuse must be mounted. For a device of more than 700W, a 13A fuse must be mounted. A complication of using the 700W rule is that some devices can draw a higher current when it is activated (entry current).

For a device of 700W or less, a 3A fuse must be installed. For devices of more than 700W, a 13A fuse must be installed. One of the complications of using the 700W rule is that some devices can generate a higher current when turning on for the first time (input current).

For a device of 700W or less, a 3A fuse must be installed. For devices of more than 700W, a 13A fuse must be installed. One of the complications of using the 700W rule is that some devices can generate a higher current when turning on for the first time (input current).

The thumb rule is that for each 20C of higher or lower temperature, the fuse must be re-evaluated more or less high 10-15. Conversely, when a fuse is intended for use under extremely low temperature conditions, the fuse must have a rating lower than that under normal conditions.

For devices up to 700 watt, use a 3-width fuse for devices from 700 to 1,000 watt, use a 5-width fuse for devices over 1,000 watt, use a 13-width fuse.