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In wiring or cabling, high voltage lines and low voltage lines should be separately installed. High voltage lines which carry AC 120V/208V/277V/480V should be installed in one conduit, and low voltage lines which carry DC 12V/24V/48V and non-current carrying lines should be installed in another separated conduit.

It is one of the strict requirement of NEC.

When AC 120V wires and DC 12V wires are laid inside of one rack, they should have spaces more than 6 inches between them.

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