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Question:

Metal wire slot MR code related issues, it is best to have a detailed table

I use the TV as a computer screen, connect the HD line, how no sound

Answer:

Look at the box are connected to what equipment to know the box type.
YJV and VV are two different types of cables, YJ is cross-linked polyethylene, V is a polyethylene sheath, VV22 is the first 2 is a double strip, the second 2 is a polyethylene sheath, 4 * 25 + 16 refers to the diameter of the wire, refers to four 25 square and a 16 square double steel belt polyethylene insulated PE jacket 5 core cable.
FD is floor wiring box (for integrated wiring) VP is cable TV branch box

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