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Question:

Video intercom indoor extension no sound how to deal with

UL certified switching power supply can not increase the lights, please tell me more

Answer:

insulation damage caused by short circuit failure. cable overload operation for a long time. oil-immersed cable due to height difference drip, oil spill. intermediate connector box insulation breakdown. cable head burning. external fire and heat caused by cable fire.
Waterproof cables can be used in different water environments depending on the waterproof rating

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