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Old 01-04-2013, 04:15 PM   #21
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Does the garage not have another 120v circuit available?

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Old 01-04-2013, 04:25 PM   #22
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Thanks for that workaround. I'll ask my electrician about that.
This isn't something I'd expect the average electrician to encounter every day. A typical part would be something like this
http://www.grainger.com/Grainger/ACME-ELECTRIC-Transformer-4LDN6?Pid=search

Note that these are not cheap (over $100). This particular one is rated at 150VA and ought to run a couple of fractional HP pumps but check the pump actual draw.
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Old 01-04-2013, 04:45 PM   #23
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He mentioned running this outlet through a spa panel in the OP, wouldn't that allow him to have 4 lines coming out and draw the 120 off one of the hot legs and the new neutral?

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Old 01-04-2013, 05:45 PM   #24
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This isn't something I'd expect the average electrician to encounter every day. A typical part would be something like this
http://www.grainger.com/Grainger/ACME-ELECTRIC-Transformer-4LDN6?Pid=search

Note that these are not cheap (over $100). This particular one is rated at 150VA and ought to run a couple of fractional HP pumps but check the pump actual draw.
150VA @ 110V ~= 1.4 Amps. Uber low.

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Old 01-04-2013, 05:48 PM   #25
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He mentioned running this outlet through a spa panel in the OP, wouldn't that allow him to have 4 lines coming out and draw the 120 off one of the hot legs and the new neutral?
He has H-H-G, and the spa panel solution (somewhat controversial, and beaten to death, http://www.homebrewtalk.com/f170/3-wire-240v-spa-panel-4-wire-out-again-372667/) is with H-H-N in.
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Old 01-04-2013, 05:57 PM   #26
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He mentioned running this outlet through a spa panel in the OP, wouldn't that allow him to have 4 lines coming out and draw the 120 off one of the hot legs and the new neutral?
A spa panel won't (can't) create a new neutral if there isn't one coming into it.
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Old 01-04-2013, 06:33 PM   #27
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150VA @ 110V ~= 1.4 Amps. Uber low.
Not really. I said it ought to run a couple based on 746/25 = 30 watts but 115*1.4 = 161 VA (these are the nameplate numbers for the 1/25 HP March pumps used by most of us). Either these things are incredibly reactive or incredibly inefficient or a bit of both.

Just checked: under load at 122 V a 1/25 HP March Pump draws 1.29 A rms for 157 VA but the power consumed is only 93 Watts so that's 93/122 = 0.76 Amp resistive and 1.29 - 0.76 = 0.53 amp reactive for a power factor of 0.59.

Also the efficiency is 30/93 = 32%.

I'm bit surprised but that's what the numbers show.

Given that OP would probably get by with a 150 KVA transformer if all he wanted to run was a single pump but would have to go to a larger transformer if he wanted a second pump or additional 120 V loads.
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Old 01-04-2013, 06:41 PM   #28
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Does the garage not have another 120v circuit available?
I do have 120 in the garage.
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Old 01-04-2013, 06:42 PM   #29
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Not really. I said it ought to run a couple based on 746/25 = 30 watts but 115*1.4 = 161 VA (these are the nameplate numbers for the 1/25 HP March pumps used by most of us). Either these things are incredibly reactive or incredibly inefficient or a bit of both.

Just checked: under load at 122 V a 1/25 HP March Pump draws 1.29 A rms for 157 VA but the power consumed is only 93 Watts so that's 93/122 = 0.76 Amp resistive and 1.29 - 0.76 = 0.53 amp reactive for a power factor of 0.59.

Also the efficiency is 30/93 = 32%.

I'm bit surprised but that's what the numbers show.

Given that OP would probably get by with a 150 KVA transformer if all he wanted to run was a single pump but would have to go to a larger transformer if he wanted a second pump or additional 120 V loads.
I just bought a single chugger pump from bobby, I'm assuming it would draw a similar load.
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Old 01-04-2013, 07:00 PM   #30
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If it's a 1/25 HP probably something pretty close but there ought to be a nameplate on it with actual numbers.

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