Quick help

[JMWElectric]

Installing power to this slurry pump system and I'm a little confused. It's asking for 1 15 amp 110v and 1 208 single phase 20amp.

Is this 208 single phase a 2 wire or a 1 wire requirement?

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[jumper]

Assuming neutral not needed, 2 wire circuit. 2 hots and 1 EGC.

 

[infinity]

You need two circuits, one @ 120 volts the other @ 208 volts.

 

[charlie b]

Is this 208 single phase a 2 wire or a 1 wire requirement?

Not sure what you mean, as no circuit is ever "1 wire." I think you need a hot-neutral-EGC for the 115v circuit and a hot-hot-EGC for the 208V circuit.

 

[Nickbruce128]

3HP Pump Specs 2 circuits. One @120v, 1@208v

 

[JMWElectric]

Not sure what you mean, as no circuit is ever "1 wire." I think you need a hot-neutral-EGC for the 115v circuit and a hot-hot-EGC for the 208V circuit.

1 circuit at 115v 15 amp - 1blk 1whit 1green

1 circuit at 208v 20 amp - 1blk 1red 1whit 1green or 1blk@208v 1whit 1green

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[gadfly56]

Not sure what you mean, as no circuit is ever "1 wire." I think you need a hot-neutral-EGC for the 115v circuit and a hot-hot-EGC for the 208V circuit.

That's what it looks like to me, as well.

 

[ActionDave]

1 circuit at 208v 20 amp - 1blk 1red 1whit 1green

That is a Multi Wire Branch circuit. You only need one blk and one red for a straight 208V circuit. White is not required.

or 1blk@208v 1whit 1green

Your not going to get 208V phase to neutral on a wye system, you would need a delta system, and your not going to get 208V phase to phase on a delta system.

 

[MAC702]

Deleted

 

[meternerd]

1 circuit at 115v 15 amp - 1blk 1whit 1green

1 circuit at 208v 20 amp - 1blk 1red 1whit 1green or 1blk@208v 1whit 1green

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I suppose you could get 120 and 208 (if you used a 4 Wire Delta and used the power leg as the 208 L/N), but I'm betting that's not what they intended. Never seen it done.

 

[ggunn]

That is a Multi Wire Branch circuit. You only need one blk and one red for a straight 208V circuit. White is not required.

Your not going to get 208V phase to neutral on a wye system, you would need a delta system, and your not going to get 208V phase to phase on a delta system.

How about a 240 delta high leg? A or C to N is 120V, B to N is 208V.

 

[ActionDave]

How about a 240 delta high leg? A or C to N is 120V, B to N is 208V.

That's phase to ground, plus you don't have a any available single pole breakers that are usable at 208V to ground unless you want to switch to 480V gear.

 

[drcampbell]

It's a little hard to read, but it seems to say:
"110 vac, 15 amps - panel logic power
208-220 vac single-phase, 20 amps pump [motor] power"

It's likely that "panel logic power" doesn't need very much power.
If that's true, one 4-wire multi-wire branch circuit, fed by one double-pole breaker, will suffice. (two hots, one white, one ground)
Connect two hots to the pump motor, and one hot & the white to the panel logic.
This will have the added advantage of de-energizing the entire assembly by turning off one breaker.

The panel logic can be fed with 120 volts and the pump motor can be fed with 240 volts, if that's what's available.

 

[gadfly56]

It's a little hard to read, but it seems to say:
"110 vac, 15 amps - panel logic power
208-220 vac single-phase, 20 amps pump [motor] power"

It's likely that "panel logic power" doesn't need very much power.
If that's true, one 4-wire multi-wire branch circuit, fed by one double-pole breaker, will suffice. (two hots, one white, one ground)
Connect two hots to the pump motor, and one hot & the white to the panel logic.
This will have the added advantage of de-energizing the entire assembly by turning off one breaker.

The panel logic can be fed with 120 volts and the pump motor can be fed with 240 volts, if that's what's available.

That can save a little money up front, but what happens if you need to trouble shoot the controls with power on but need to lock out the pump? I suppose you could put in a separate disconnect, but if the control panel needs to send diagnostic information when the pump trips out, you're back to square one again.

 

[ggunn]

That's phase to ground...

Well, yes, but N and G are bonded.

 

[ActionDave]

Well, yes, but N and G are bonded.

And that is not 208V phase to phase.

 

[jumper]

That's phase to ground, plus you don't have a any available single pole breakers that are usable at 208V to ground unless you want to switch to 480V gear.

Just use one side of a 240V 2P breaker.

And that is not 208V phase to phase.

Pump/does not care. It will accept 208v of either flavor.

Yes, this a bad idea- but it could be done.

 

[ActionDave]

Just use one side of a 240V 2P breaker.
Pump/does not care. It will accept 208v of either flavor.

Yes, this a bad idea- but it could be done.

I understand that.

This is what the op said when he was asked what he meant by a 1 wire circuit.

1 circuit at 115v 15 amp - 1blk 1whit 1green

1 circuit at 208v 20 amp - 1blk 1red 1whit 1green or 1blk@208v 1whit 1green

I think I get what he means, but I'm not sure. I was looking for some clarity. You can have 208V phase to phase or you can have it phase to ground, but it's one or the other most days of the week. Which is he talking about?

 

[jumper]

I understand that.

This is what the op said when he was asked what he meant by a 1 wire circuit.

I think I get what he means, but I'm not sure. I was looking for some clarity. You can have 208V phase to phase or you can have it phase to ground, but it's one or the other most days of the week. Which is he talking about?

IMO he he needs two 2 wire circuits.

115V, 1H and 1N
208V, 2 H

The one wire phase the OP used is bad terminology referring to how many hots.
Pretty sure that pump does not need a noodle.

 

[ggunn]

And that is not 208V phase to phase.

I never said it was, only that it is possible to get both 208V and 120V from a 240V delta high leg service. Both are L to N. It's also possible to get 208V (L to L) and 120V (L to N) from a 208V wye. That seems pretty simple; what am I missing?