How 'Bout This Baby?

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Dennis Alwon said:
All this item seems to do is take 120v from 2 different phases.
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Yes, that is exactly it.

But if they happen to use this in a building with multiple transformers and end up connected to different transformers the neutral current flow will end up on the EGCs.

Also notice they say to make sure the circuit is not GFCI protected. That is because this unit would trip any GFCI.
 
I'm not so impressed with that baby but I am with this one.


Ugly%20Baby.jpg
 
iwire said:
But if they happen to use this in a building with multiple transformers and end up connected to different transformers the neutral current flow will end up on the EGCs.
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I don't see why you say neutral current. But I see where current would flow on the transformer primary EGC's to thier source to complete the circuit.
 
chris kennedy said:
But I see where current would flow on the transformer primary EGC's to thier source to complete the circuit.
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Is this correct? If I had 1 phase from 1 transformer, and another phase from a different transformer, would there have to be a physical connection between the 2 tranny's for 240V equipment to work?
 
If I had 1 phase from 1 transformer, and another phase from a different transformer, would there have to be a physical connection between the 2 tranny's for 240V equipment to work?
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There is a connection, the EGC.

I don't see why you say neutral current.
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Lets say you have this box hooked up across to different single phase SDSs.

Now lets say the load was 15 amps on 'A' and 5 amps on 'B' that would mean the neutral will have 10 amps on it.

That 10 amps will go both directions on the neutrals and then through the bonding jumper and back to the source.

I do not know what would happen if you happened to grab one phase from a single phase SDS and the other from a three phase SDS.....I am sure it would not be 240 but I don't know what it would be.

I think Smart or Rattus will have to vector this out. :)
 
iwire said:
There is a connection, the EGC.



Lets say you have this box hooked up across to different single phase SDSs.

Now lets say the load was 15 amps on 'A' and 5 amps on 'B' that would mean the neutral will have 10 amps on it.

That 10 amps will go both directions on the neutrals and then through the bonding jumper and back to the source.

I do not know what would happen if you happened to grab one phase from a single phase SDS and the other from a three phase SDS.....I am sure it would not be 240 but I don't know what it would be.

I think Smart or Rattus will have to vector this out. :)
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Bob the devices in Dougs OP are NEMA 6-15R's. There is no neutral.

And don't encourage Smart or Rattus. I get headaches trying to figure out what they are talking about.:grin: Just kidding guys, keep them coming, I'm bound to learn something sooner or later!
 
chris kennedy said:
Bob the devices in Dougs OP are NEMA 6-15R's. There is no neutral.
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No, but draw two independ transformer secondaries, connect a load from a radomly-selected line on one to a randomly-selected line on the other, and then trace the complete circuit.

You will see that there must be a connection between some conductor on one secondary and some conductor on the other. This would most likely include the intentionally-bonded neutral of each secondary.
 
iwire said:
I do not know what would happen if you happened to grab one phase from a single phase SDS and the other from a three phase SDS.....I am sure it would not be 240 but I don't know what it would be.
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Probably something akin to the various voltages available between terminals in the devices-from-different-systems-in-one-box discussions.
 
LarryFine said:
Probably something akin to the various voltages available between terminals in the devices-from-different-systems-in-one-box discussions.
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That much I knew. :D

I just don't know how to predict the voltages, it seems to me mixing the single phase with the three phase would add another level of complexity to the previous discussions. :)
 
LarryFine said:
No, but draw two independ transformer secondaries, connect a load from a radomly-selected line on one to a randomly-selected line on the other, and then trace the complete circuit.

You will see that there must be a connection between some conductor on one secondary and some conductor on the other. This would most likely include the intentionally-bonded neutral of each secondary.
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I see Larry, thank you. Picture worth a thousand words.
 
chris kennedy said:
I see Larry, thank you. Picture worth a thousand words.
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I agree with Larry and that was what I meant when the system circuits where connected by the EGCs.

However I brought up the neutral because I incorrectly assumed that the unit also supplied the neutral, the other versions of this did..

Say two 15 amp plugs supplying a 50 amp RV receptacle.

Or two 15 amp plugs supplying a 120/240 dimmer rack for a DJ etc.
 
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