General electricity system, just meet under non-fire conditions, it is according to the general requirements for selection. The power supply line of fire power equipment, fire-fighting equipment must meet the fire at the time of continuous power supply time to ensure circuit integrity and system uptime. At the same time, must also consider the fire risk of the power cord to avoid short-circuit, overload and become the source of fire, the fire under the external action should not contribute to the spread of fire, can effectively reduce the harmful gas decomposition of the organic insulating layer, to avoid the "second disaster" production.