Reasonable choice of power supply

Your first look at what type of electrical equipment is, under normal circumstances the load is not purely resistive. So when in the actual selection of electrical equipment according to the rated power, power factor and electric transformer and other specific circumstances a reasonable choice of power supply, the output power should leave appropriate headroom, especially when the impact load selection margin to be larger, specifically how selection is as follows:
⒈ purely resistive load such as mcb circuit breaker, resistance wire, electric furnace and other equipment, power voltage regulator power load equipment should be 1.5 to 2 times.
⒉ inductive and capacitive loads such as fluorescent lamps, fans, motors, pumps, air conditioners, Circuit breaker, refrigerators and so on. Regulator power should be three times the load equipment power.
⒊ large inductive, capacitive load environment, the selection of the starting current of the load should be considered particularly large (up to the rated current of 5 to 8 times), so I chose regulator power load power should be more than three times.