220 volt on off switch wiring diagram12/31/2023 ![]() ![]() It's simply a matter of finding the right geometry that the reed switch likes. Since a dryer draws 23 amperes on full, that's plenty. These typically throw at 10 ampere-turns. The two 24V wires go to both sides of a magnetic reed switch. This means it'll have at least 8 wires: 4 for the DPST contacts, 2 to supply lineside power to the transformer, and 2 for the aforementioned 24V wires. It will provide 2 low-voltage wires, and when they are shunted (shorted), the relay operates. Typically these mount in a 1/2" knockout hole. The relay needs to be DPST-NC (normally closed) (meaning 2-pole, normally on). That way you will be using low voltage with oddball parts, and Code is greatly relaxed. You'll need a large steel box to put this in (a 5" square deep box is not excessive), and then a listed relay+transformer combo device, in which a transformer makes just enough 24V to operate the integral relay. The idea is to power both receptacles all the time unless the dryer is drawing power, then shut off the other one with a normally-closed relay. ![]() Ironically this may break out as the cheapest option. In this case you're normal-feeding two loads, and interlocking the loads.)Īt some later happy day, you retrofit larger cable and turn this panel into a more useful subpanel. (Normally with these interlocks, you backfeed the panel with one of two power sources. Then "mis"use a generator interlock kit ( such as this sensibly priced Siemens one for Siemens panels) to interlock your dryer's and other load's breaker so they can't be on at once. Feed it normally, from the current 30A dryer circuit. So with an eye toward that and future expansion. It cripples you and forces you into bad or expensive compromises. That's because a full panel is intolerable. If you spend time around here, you'll hear us preach a lot about getting panels with lots of extra spaces. Better, a subpanel with a "generator interlock" A big-box store is not an electrical supply house. If you don't like paying $60 for a switch that crams this functionality into a 1-gang yoke, then visit your local electrical supply house and ask them for other options which may trade form-factor for price. The 1288 works pretty hard, hence the price. The different prices reflect different ratings (MS=Motor Start, tungesten, ballast etc.) or the varying difficulty of cramming all that into the small 1-gang form-factor. The MS303 is 3PST since it's for 3-phase power.The 3032-2x and MS302-DS are double-pole single-throw (DPST) switches."Double" means it connects Common to outputs 1 or 2. "Single-throw" means it can only connect Common to output 1, or not. You need double-pole but triple would be nice as I consider it elegant to also switch neutral, it being a conductor. Poles are the number of independent channels the switch has - single-pole, double-pole, triple-pole, or n-pole. I could resort to just using one plug and unplugging one then plugging the other one in, but I don't see the point of constantly exposing live wires (the plugs) where something could inadvertently fall on them or water could be sprayed, instead of keeping things all sealed in the wall with a safe, simple switch between two plugs. The breaker box is full, it's a long and difficult wire run, and I do not need a separate circuit because I'll NEVER need to run both devices at once. Personally, I don't care if it's a knife switch, something that looks like a standard light switch, two buttons, has relays, I don't care. Manufacturer and exact part# is what I'm looking for. I'm hoping someone can recommend specific switches that will do what I want. Note: the second circuit will not use more than 15A, maybe just 12A. Hardly any show their wiring diagrams, so if they don't give more details, I don't know if they'll work. There are tons of DPDT switches I've found, and most seem to be ON-OFF. I'm looking for a switch to use, like a DPDT ON-ON break-before-make switch. I've got a situation where I have a 240V 30A dryer line, and I want to power something else from the same circuit, but NEVER at the same time as the dryer. ![]()
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