Abstract
By excess current over the allowable current-carrying capacity, the insulation of low tension cable will smoke or flame, or its conductor will fuse as the amount of current increases.
After testing the various kinds of insulated single conductor or stranded cable, 1.6 mm diameter by D. C. current, we can get the followings :
(a) Minimum current density necessary for fusing the various kind of insulated cable.
(b) Time-current characteristics for smoking, flaming and fusing of the various kinds of insulated cable, will be shown by the following formulae
logt=A+Blogi
Where i is current in ampere，t is period of its duration in second, and A and B are constant, which are shown by the table for each case.
