Overload protection

Although it is PERMITTED to omit short circuit circuit protection as described above, it is my view very poor practice unless unavoidable.

Example, cables less than 3m in length that connect a 110 volt battery to a control panel. I would if reasonably practical provide short circuit protection WITHIN the battery by fitting a suitable fuse between cells near the middle of the string.

Example, cables less than 3m in length that connect the secondary side of a transformer to a fuse board or other equipment. I would if reasonably practical specify cables of sufficient size that they are protected against short circuit by the HV fuses or circuit breaker on the primary of the transformer.

Example, cables within switchgear, connecting for example a relatively small switch fuse to a relatively large busbar. I would if reasonably practical select cables large enough that they are protected against short circuit by whatever protects the supply into the busbar.

Just because under certain specified conditions you CAN omit short circuit protection, does NOT mean that so doing is a wise design choice, unless there is no realistic alternative.

Although it is PERMITTED to omit short circuit circuit protection as described above, it is my view very poor practice unless unavoidable.

Example, cables less than 3m in length that connect a 110 volt battery to a control panel. I would if reasonably practical provide short circuit protection WITHIN the battery by fitting a suitable fuse between cells near the middle of the string.

Example, cables less than 3m in length that connect the secondary side of a transformer to a fuse board or other equipment. I would if reasonably practical specify cables of sufficient size that they are protected against short circuit by the HV fuses or circuit breaker on the primary of the transformer.

Example, cables within switchgear, connecting for example a relatively small switch fuse to a relatively large busbar. I would if reasonably practical select cables large enough that they are protected against short circuit by whatever protects the supply into the busbar.

Just because under certain specified conditions you CAN omit short circuit protection, does NOT mean that so doing is a wise design choice, unless there is no realistic alternative.