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NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
21.5 A fuse connected in an output circuit of a power inverter shall comply with the requirements for
line-voltage fuses and fuseholders.
21.5 effective April 13, 1993
21.6 An uninsulated live part of a fuseholder that can result in a risk of electric shock, other than the
screw shell or clips, shall not be exposed to contact by a person removing or replacing the fuse.
21.6 revised October 15, 2004
21.7 The screw shell of a plug-type fuseholder and the upper terminal of an extractor-type fuseholder
shall be connected toward the load.
22 Receptacles
22.1 A 15- or 20-ampere attachment plug receptacle shall be of the grounding type. The grounding
contact of the receptacle shall be reliably electrically connected to the grounding means of the converter
or inverter.
22.1 effective April 13, 1993
23 Inverter Output Circuits
23.1 Inverter equipment having output circuits for supplying 120 volts, 60 hertz, 2-wire with ground or
120/240 volts, 60 hertz, 3-wire with ground to vehicles and recreational vehicle wiring systems shall have
the output circuits protected by integral ground-fault circuit-interrupters intended for the current involved.
Exception No. 1: Inverter equipment that does not have an integral output receptacle, and that has a
wiring compartment with pigtail leads, wiring terminals, or other equivalent means for output field-wiring
connections need not be provided with integral output circuit ground-fault circuit-interrupter protection if:
a) The equipment is marked in accordance with 57.22, and
b) The installation and operating instructions manual for the inverter comply with 58.1.
Exception No. 2: A portable inverter:
a) Intended to be connected to the cigarette lighter outlet of a vehicle and
b) Having no direct electrical connection between the input and output circuits
need not be provided with integral ground-fault circuit-interrupter protection.
23.1 revised October 15, 2004
OCTOBER 15, 2004UL 45836
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