What is AC cable?

An 'a.c. cable' is an electrical cable designed to work with alternating current, rather than with direct current (d.c.). There are a number of important differences, one of which is the level of insulation necessary. For example an d.c. cable designed to operate at 100 V would not be suitable for operating at 100 V a.c., because all quoted values of a.c. voltage are root mean square (rms) values -which means that a 100 V a.c. cable's insulation must be able to withstand a peak value of around 140 V.