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Limited power source (LPS) power supplies are designed with prescribed output voltage, current, power and short circuit current limits. Specific methods can limit the capacity of the power source. The requirements for wiring and loads supplied by LPS power supplies are relaxed due to the reduced hazard of electric shock or fire caused by an LPS power supply. Power supplies offered as conforming to LPS must have either internal power limiting provisions or external devices limiting current delivered to the load. Internal power limiting can be accomplished by one of the three methods listed here. External devices limiting current delivered to the load can be fuses or circuit breakers. If circuit breakers are employed they must be non-adjustable, non-auto resetting and electromechanical.
