If one had a typical AC relay (120/240VAC contacts, 120VAC or 24VAC coil, chassis mount), how would they mount it inside a junction box (assume a blank faceplate) and attach wires to it in a way that's Code compliant?


I would use a 6x6x4 junction box and mount the relay to the back with Tek (drill point) screws. This should give you plenty of room for wiring and terminations.

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  • Makes sense so far, but what types of terminations would be legal under the Code? Many of these relays use tab (quick connect, faston) terminals, and I am not sure if that type of device termination meets the NEC. – ThreePhaseEel Oct 18 '14 at 17:41
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    Why wouldn't they? If they are 1/4" tab then female tab terminals are what to use. There is nothing in the NEC that dictates a certain type of terminal must be used or not allowed. You just cannot rely on solder alone, it must be a mechanical connection. – Speedy Petey Oct 18 '14 at 18:16
  • Oh! Thanks! I was simply not sure if tab terminals were considered along with rings and spades when the NEC speaks of crimped (pressure) connections. – ThreePhaseEel Oct 18 '14 at 21:24
  • If they're industry standard relays (tab) spade terminated for industrial use, they will have a mating socket they plug into available. The sockets are designed to fit into a sort of bracket that allows for solid mounting. The terminations on the socket will be screw lugs similar to what you find on circuit breakers. – Fiasco Labs Oct 19 '14 at 15:16
  • @Fiasco, look at the link in the question. These are self contained relays with mounting lugs. Not DIN rail bases and ice cubes relays. – Speedy Petey Oct 20 '14 at 0:36

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