![]() ![]() So, a deep rectangular plastic box of 22.5 in3 would be adequate. ![]() So the total volume is 3+3+1+2 or 9 volumes x 2.5 (for 10 ga) for a total volume of 22.5 in3. I'm not sure if the single 240 volt outlet should count as one or two volumes, but let's assume it counts as 2 volumes. For "fill" calculations there are 3 wires entering, 3 wires leaving, a ground wire, and the receptacle. I'm just wondering if you recommend larger boxes for 240 volt outlets than those based on NEC minimum "fill" requirements? Note, there will be only a single 240 volt outlet in any box on the 240 volt "ring" circuit.įor example, say I decide to use 10-3 with ground wire to an 240 volt outlet box which will have an outlet but also pass through to other outlet boxes on the "ring" circuit. I'm familiar with the box "fill" requirements of the NEC. What shape and size electrical boxes do you guys recommend for 240 volt outlets? The boxes will be located within the walls. With the possible exception of the cyclone all of the 240 volt machines will have plugs going into 240 volt outlets. Also, what types of 120 volt auxiliary services have you guys seen on 240 volt machines, besides task lighting? But, if there are separate 240 volt cord and plug and 120 volt cord and plug on the machine then there is no need for using 10-3 with ground wire on this circuit since I will have plenty of dedicated 120 volt outlets around the shop that can be used for the separate 120 volt plug of the machine. It seems to me that if there are machines that require an integrated 240/120 volt service then this design makes sense. Does this design makes any sense? How often have you guys seen machines that require both 240 and 120 volt power, coming in on a single cable? In other words, the 240 volt and 120 volt services are integrated, as opposed to the situation where there is a 240 volt cord and plug and a separate 120 volt cord and plug for auxiliary service on a single machine. The electrical inspector in town recommended using 10-3 with ground wire for the "ring" circuit so that I would have the option of having 120 volt at the 240 volt machines for auxiliary 120 volt services such as a spot light, etc. Plus, I'm installing a 240 volt "ring" circuit which will power the jointer, bandsaw and any other future 240 volt machines. I'm installing dedicated 240 volt circuits for the cyclone and for the table saw. So, I have a few questions on what to use for boxes and outlets (receptacles) for 20 amp and 30 amp 240 volt circuits. While I have some experience wiring 120 volt circuits, my experience with 240 volt circuits is limited to clothes dryers and electric stoves which use 50 amp surface-mounted fittings which are a combined box and outlet. ![]()
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