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12v DC and 240v AC in enclosure

dcbwhaley

I am designing an enclosure which contains several relays which switch 240v AC lighting.

The relays have 12vDC coils driven from electronic circuitry. 

Doe the 12 volt wires have to be insulated to 240v or can I rely on the insulation of the 240v wires to preserve separation?

  • 0

    This will depend how you intend to meet the CE marking requirement of the LVD , and if your are declaring it as class I or II, and if the 12V or anything connected to it gets to the outside of the enclosure.

    Generally I'd not expect single insulated mains and 12V wiring looms in close proximity. If the wiring is well secured so there is no credible way  it could reach even if any one thing came detached, you are OK.  also if the 12V became 'live' but no one could get into the box to touch it, that too would be OK. (so things like external sockets, USB leads,  battery holder etc where someone can stick a finger on the 12~V side mean that any such fault would  be exported, and needs consideration. . A sealed box however, is fine.)

    Otherwise barriers, over-sleeving etc can be used to 'uplift' the insulation to reinforced on any tricky sections. On any PCB also remember tracking distances are much higher than air clearances.

    Mike,

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