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I'm renovating a bathroom in my home built in 1958 and went to replace a bank of wall switches when I came upon this wiring. I've changed all of the switches and plugs in the rest of the house and haven't come across one wired like this before. All of the switches are connected together on the bottom terminal. Can someone explain to me if this is wired properly, or if it should be rewired? Also, is it possible for me to put change the switch on the far left to a dimmer switch without causing any problems? Thanks!

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    I would bet that's parallel rather than series -- sharing a hot by daisy-chain connection rather than by tying pigtails together. – keshlam Oct 28 '15 at 23:55
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    Pretty sure this is frowned upon (if not completely against code). They should probably be pigtailed to make it "right" – Joe Phillips Oct 29 '15 at 14:43
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Basically, the wire that is connected to all of the switches (in parallel) is the HOT wire coming from your circuit breaker/fuse box. The other wire on each switch is going to the load (light or outlet). As @keshlam alluded to in his comment, this is equivalent to the common wire going to a wirenut with separate pigtail wires to each switch.

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    This is a fairly common wiring technique, and is also done quite often with the grounding conductor. – Tester101 Oct 29 '15 at 1:28
  • Ah, I understand now. So I would have no problem putting a dimmer on the switch on the left, right? – Vincent Oct 29 '15 at 1:59
  • You shouldn't have trouble. Assuming the dimmer has wires already attached, you would combine the two existing wires (it looks like that's the first switch in the series) together with the black wire for the dimmer in an appropriate sized wirenut. – DoxyLover Oct 29 '15 at 8:03

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