SPT - 1
UL 20288: For use in chain link of chain suspended lighting fixtures.
SPT-3: For heavy-duty use in damp location: especially suitable for refrigerators and room-size air conditioners.
SPT-2 is for heavier consyruction than SPT-1
SPT-1 SPT-2: For use in household clocks, fans, radios and similar appliances.
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