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Message
Number of outlets on 220V 30A breaker.
Posted on 6/15/21 at 9:23 am
Posted on 6/15/21 at 9:23 am
Last summer I had a subpanel put in for my garage and included a 220V/30A circuit, but only put in one outlet for my table saw. Since then, I've gotten a jointer and bandsaw that also run on 220V. I currently have a small extension cord I use to run those machines, but I'm having to plug everything in every time using the one outlet. I'm confident in my ability to add another outlet near the jointer and bandsaw without getting the electricians back out. But I'm not sure what code is on that. I've seen things where people state that by code, 220V/30A circuits can only have one outlet. I'm not really worried about overloading the circuit as the tools would never be run at the same time. This is just for making it easier to jump from machine to machine without rearranging extension cords. I'd like to stay up to code when it comes to selling the house in the future, etc.. Anyone familiar to confirm?
6
Posted on 6/15/21 at 9:52 am to Jon A thon
it is a gray area. The safest choice is one outlet per circuit since anything requiring 240V is going to be a high powered device. NEC is not going to allow a situation where running them at the same time overloads the circuit. Sure, you might never do that but NEC doesn't care. NEC cares about what "could" happen and preventing that from causing problems/fires.
Posted on 6/15/21 at 10:08 am to notsince98
Why not just build an “extension cord” with the connections to your machines? Permanent code installation stays the same, you do effectively the same thing you’d do “in wall” just outside of it.
If you want it to appear clean, just do a surface mount installation and plug it into the outlet vs hard wiring.
If you want it to appear clean, just do a surface mount installation and plug it into the outlet vs hard wiring.
Posted on 6/15/21 at 11:56 am to notsince98
quote:
The safest choice is one outlet per circuit since anything requiring 240V is going to be a high powered device. NEC is not going to allow a situation where running them at the same time overloads the circuit. Sure, you might never do that but NEC doesn't care. NEC cares about what "could" happen and preventing that from causing problems/fires.
I'm not aware of any 240V outlets designed to allow additional outlet to be wired in series, probably for good reason. Just make sure the panel has the capacity too. I ran two 40A 240V circuits for my welder, I'll run yet another dedicated circuit for a 60-gallon compressor too one of these days.
Posted on 6/15/21 at 12:28 pm to Jon A thon
Technically, you can have branch circuits (multiple outlets) but you can't have multiple devices plugged in that exceed 80% of the rated current capacity.
If you want them plugged in all the time and want to meet code you need multiple circuits.
quote:
NEC 210.23(B):
210.23 Permissible Loads, Multiple-Outlet Branch Circuits. In no case shall the load exceed the branch-circuit ampere rating. A branch circuit supplying two or more outlets or receptacles shall supply only the loads specified according to its size as specified in 210.23(A) through (D) and as summarized in 210.24 and Table 210.24.
...
(B) 30-Ampere Branch Circuits. A 30-ampere branch circuit shall be permitted to supply fixed lighting units with heavy-duty lampholders in other than a dwelling unit(s) or utilization equipment in any occupancy. A rating of any one cord-and-plug-connected utilization equipment shall not exceed 80 percent of the branch-circuit ampere rating.
If you want them plugged in all the time and want to meet code you need multiple circuits.
Posted on 6/15/21 at 12:54 pm to Jon A thon
Personally, I'd probably just rig it externally or rig it from a junction box externally and then when it comes time to sell/ home inspection just pull everything from the junction box going forward. I don't think a home inspector or anyone else is going to open your junction box to see what's going on.
Posted on 6/15/21 at 1:38 pm to Jon A thon
Add circuits hard wire it to your sub
Posted on 6/15/21 at 9:01 pm to Cracker
Main and sub panel are on the other side of the house. Would have about a 200'+ run fished through the attic. All garage lines are in EMT, so I can just temporarily do it, then pull down the branched outlet later.
Posted on 6/16/21 at 6:16 am to Jon A thon
quote:
I'm not really worried about overloading the circuit as the tools would never be run at the same time.
Just because you don’t plan on running both outlets at the same time doesn’t mean the next guy who owns the house wouldn’t need/want to. This is the reason it’s against code to do what you are trying to do.
Posted on 6/16/21 at 6:47 am to MikeBRLA
quote:
This is the reason it’s against code to do what you are trying to
Understood, but I have many 110V outlets on the same 15A circuit that can add to significantly more that 15A if all used. I realize it's different for 220V, especially since most appliances are large. But that's not really my specific case as the max draw on any one tool is like 12 amps. I just wasn't 100% sure before I went tinkering with stuff.
Posted on 6/16/21 at 8:27 am to Jon A thon
120V outlets are a bit different in that the code allows you to assume a 180VA load per duplex. There is no such allowance for outlets rated more than 120V/15A or 120V/20A.
Posted on 6/16/21 at 8:35 am to Jon A thon
Run a BX type cable on exterior of wall from existing outlet to where you need another outlet and just add an outlet.
Easy to hold that style cable in place with single screw conduit clamps here and there.
If you ever sell and they complain, it is easy to remove, save, and re-use later if you ever need.
Easy to hold that style cable in place with single screw conduit clamps here and there.
If you ever sell and they complain, it is easy to remove, save, and re-use later if you ever need.
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