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Two things running off one 220v?

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Forum topic by okacookie posted 07-29-2014 08:43 PM 856 views 0 times favorited 26 replies Add to Favorites Watch
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okacookie

24 posts in 354 days


07-29-2014 08:43 PM

Hi everyone,

Well I finally managed to get a good deal on a Delta 50-850. Got it for $150 and I also traded a weedeater that has not been running well anyway. To my surprise the guy threw in all of the flex hose he had, clamps, connections and even a free standing dust hood.

My question is I was planning on running a 30amp 220v breaker to run my table saw, and at some point a planer once I get some more spare cash. My question is is it safe to run both my table saw (Ridgid r4513) and this dust collector on the same breaker. It looks like each one is about 7 amps on 220v.

Obviously if I get a large planer I won’t be able run both at the same time, but I could probably switch back to 120v for the DC.

Thanks,
Chris


26 replies so far

View joeyinsouthaustin's profile

joeyinsouthaustin

1264 posts in 758 days


#1 posted 07-29-2014 10:15 PM

I can not speak as an electrician, nor will I recommend doing it. I will say that I am currently doing it, and have been for about a year…. but don’t do it ;)

-- Who is John Galt?

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patron

13097 posts in 2026 days


#2 posted 07-29-2014 10:23 PM

don’t start both at the same time
(the start up amps
could kick the breaker)

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View TopamaxSurvivor's profile

TopamaxSurvivor

14849 posts in 2361 days


#3 posted 07-29-2014 10:40 PM

It is not commonly done as most 240 volt items are on a dedicated circuit. Just before I retired I did a multiple outlet 30 amp 240 volt circuit in an airplane hanger. New code just came out July 1, but I doubt if that changed. Glad I don’t have to buy the new code book every three years any more ;-)

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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okacookie

24 posts in 354 days


#4 posted 07-29-2014 11:09 PM

Yeah I figured starting both at once would be a bad idea :). Can you put 20a outlets on a 30a breaker? I like to be to code if possibly for liability reason, because with my luck the house would burn down and they would blame that.

View TheFridge's profile

TheFridge

899 posts in 171 days


#5 posted 07-29-2014 11:17 PM

No.

-- "We build our workshops. Then we enjoy the fruits of our labor by laboring for more fruits." - Me

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patron

13097 posts in 2026 days


#6 posted 07-29-2014 11:25 PM

i been running my tools one a 30 amp breaker
with an extension cord i made with duplex 20 amp outlets
every 10’ (they plug 15 amp plugs too)
haven’t tripped the breaker yet
or started any fires

like i say one tool startup at a time
been running ts mortiser 8” jointer
16” band saw and 13” belt sander
my shop vac is on a separate circuit however
and the 20” planer separate also
all on extension cords i made
in gang boxes

building a bigger shop here
will go back to multi circuits for that
with dedicated lines to all my tools

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Grandpa's profile

Grandpa

3179 posts in 1361 days


#7 posted 07-29-2014 11:32 PM

make sure you size the wire for the breaker. The receptacle is inside a box and would probably be okay. The breaker protects the wiring inside the wall.

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TheFridge

899 posts in 171 days


#8 posted 07-29-2014 11:36 PM

What’s right and what will work are 2 different things.

You can put a 15A recept on a 20A ckt (like your kitchen recepts) or a 40A recept on a 50A ckt.

The problem isn’t combining the load, it’s the 20A receptacles. The fact that it will be 240v doesn’t matter.

You could pull 2-12/2s or a 12/4, or put 2-20A recepts on a 12/2. Any of these options are fine with code, but you can’t put a 20A recept on a 30A ckt. Technically.

-- "We build our workshops. Then we enjoy the fruits of our labor by laboring for more fruits." - Me

View TopamaxSurvivor's profile

TopamaxSurvivor

14849 posts in 2361 days


#9 posted 07-29-2014 11:39 PM

Code probably requires a permit with inspection in most areas. 20 amp devices are only legal on a 20 amp circuit. You need 30 map outlets on a 30 amp circuit.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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bonesbr549

226 posts in 1752 days


#10 posted 07-29-2014 11:42 PM

Well, based on what you say it could be possible, but you may have issues with extended use. Running two power tools in the future will not be a problem as its extremely unlikely you would run a TS and planer at the same time.

I’ve made it my policy for many years to have two circuits for the shop for the big tools. One dedicated to my big DC and another series of outlets to hook the rest of my 220v tools up. I’ve added a 3rd for my 3 phase but that was a got to. I also have one 20a 110 circuit for hand tools. One suggestion though split your lights and don’t have them on the same circuit.

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patron

13097 posts in 2026 days


#11 posted 07-29-2014 11:42 PM

right you are fridge and bob

why i’m building a real shop now
will have many dedicated circuits then

all to code
by a real electrician

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Grandpa's profile

Grandpa

3179 posts in 1361 days


#12 posted 07-29-2014 11:46 PM

I ran a dedicated circuit for each of the 220 power tools and have 5 receptacles on each 110V receptacles. I ran 2 different circuits for the lights. If something happens that trips the breaker I don’t want to have to feel my way to light. Should only lose half the lights unless I have the entire shop go off line. If you ever trip a main you have a real problem

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okacookie

24 posts in 354 days


#13 posted 07-29-2014 11:59 PM

A little more details on why I am asking this. I have very limited breaker space left. I only have 100A service, and I only have a handful of open spots left. I already have installed my lights on their own circuit and have installed one outlet on its own 20a breaker. In the near future when I plan on tearing down my drywall and insulating my one car garage I will extend this to at least 4 outlets, and install a second 20a with another 4 outlets. This will leave me enough room to add one 220v breaker. This will leave me one open spot to add two more circuits for future remodels in the main house (half the house is on one breaker for some reason).

I may do the extension cord idea with a few outlets on it. That way only one outlet will be wired to the panel.

View Rob's profile

Rob

323 posts in 1756 days


#14 posted 07-30-2014 12:19 AM

okacookie, is all this wiring going into your garage? If so, consider installing a subpanel in your garage instead of individual circuits run from your main panel will give you better flexibility, not to mention the convenience of not having to go inside the house when you trip a breaker.

I have 100A service in my home and only had room for 2 more breakers. My electricians initially told me they could only run two circuits to my one-car garage. I asked if they could do a subpanel, and they said yes (I don’t know why I had to suggest it instead of them). I had them install a 60A subpanel (apparently the max in my case), two 20A/240V circuits, and two 20A/120V circuits. I’m running my lights on the 15A circuit that was already in the garage.

Another thing the installers told me for the 120V circuits was that a shared circuit requires GFCI receptacles, while a dedicated circuit does not.

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okacookie

24 posts in 354 days


#15 posted 07-30-2014 12:40 AM

My panel is in my garage luckily so this makes all of these expansions pretty easy. I have considered a sub panel, but I wish I could just upgrade to a 200a service. That will not be in the cards due to cost most likely.

Chris

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