Common codes for cables

Use code-not marked as power cable, K- (control cable), P- (signal cable);
Conductor material code-not marked as copper (can also be marked as CU), L- (aluminum);
Inner sheath code-Q- (lead package), L- (aluminum package), H- (rubber cover), V- (polyvinyl chloride sheath), inner sheath is generally not marked;
Outer sheath code-V- (polyvinyl chloride), Y- (polyethylene power cable);
Derived codes-D- (no drip), P- (dry insulation);
Special product codes-TH- (wet tropical zone), TA- (dry tropical zone), ZR- (flame retardant), NH- (fire-resistant), WDZ- (low smoke and halogen-free, enterprise standard)

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