208v panel feeding for 240V subpanel

[QES]

Can you feed a 240V subpanel from a 208 3p panel using a 2P breaker?

 

[iwire]

Can you feed a 240V subpanel from a 208 3p panel using a 2P breaker?

Yes. :smile:

 

[augie47]

it has feathers and quacks but.........

it has feathers and quacks but.........

would it still be a "240 volt panel" ?? :grin:

(my mind wanders to all the discussions of 120/208 vs 208/120, etc. lol )

 

[Simpsonelectric]

Can you feed a 240V subpanel from a 208 3p panel using a 2P breaker?

No it is not 3 or 1 phase 208V. They are 1 phase panels 240V

Thanks
Steve Simpson

 

[Jim W in Tampa]

No it is not 3 or 1 phase 208V. They are 1 phase panels 240V

Thanks
Steve Simpson

Anything to back that up with ?You saying i cant have single phase lights ?

 

[Simpsonelectric]

Yes. :smile:

Well I don't think you can. If the dock plug is rated 230 volts you have to supply 230 volts. The rating of the recept. In my case I do have some (3) 3 phase large pedistals that can be fed from one of my 3 Phase 208 V panels and the plugs are rated 208 volts stamped right on them.The 230 volt ones are all fed from a 230 volt, single phase transformer.

Steve Simpson

 

[Jim W in Tampa]

Very unlikely they actually need 240 most really only need 2 x120 unless you have a serious ship docking there.

 

[Simpsonelectric]

Anything to back that up with ?You saying i cant have single phase lights ?

I am sorry, I seem to have to gotten into another thread. I was speaking of dock power.

Steve Simpson

 

[Jim W in Tampa]

I am sorry, I seem to have to gotten into another thread. I was speaking of dock power.

Steve Simpson

I figgured that and see no problem with it

 

[Simpsonelectric]

Can you feed a 240V subpanel from a 208 3p panel using a 2P breaker?

To follow up, just because a panel is rated 250 volt there is no reason you can't feed it with 208 volts. The panel is now simply rated and marked 120/208 volt and all equipment and motors must be rated to use the 208 power sourse. The 120 phase will always be there for you to use for your general power requirments.

Steve Simpson

 

[QES]

any art. from NEC that I can ref. it from?

 

[tom baker]

Yes you can but you can not reduce the size of the neutral, I was looking for the code section but can find it at the moment.

 

[frenchelectrican]

Tom .,,
C'est les m?mes r?gles comme le multi le circuit de branche de fil est. sur la sur provision de trois phase
[ it is the same rules as multi wire branch circuit is. on the three phase supply ]

it will mention more than one place i know for sure.

Merci,Marc

 

[iwire]

Well I don't think you can. If the dock plug is rated 230 volts you have to supply 230 volts. The rating of the recept. In my case I do have some (3) 3 phase large pedistals that can be fed from one of my 3 Phase 208 V panels and the plugs are rated 208 volts stamped right on them.The 230 volt ones are all fed from a 230 volt, single phase transformer.

Steve Simpson

Steve you can use a 600 volt rated panel on 208 if you want and it is commonly done.

You can not exceed the maximum.

 

[QES]

Thank You....

I hope the city will not give me any problem.
The city told me that you can not go from a 208/120V 3-phase system to a 240/120V 1- phase system without a transformer.

 

[cpal]

What type of load is the panel supplying??

 

[QES]

the 120/240 panel?
mostley lighting 120v and 1 204/208 heater.

 

[crossman]

There may be some confusion here. Are we talking theory or code?

If you want an actual measured 120 and 240 volt system at the new panel, you cannot get this from a 208/120 system without the use of transformers or some other means like a motor-generator set.

If you just need 120 and 208 at the new panel, then it is okay to buy a panel that is normally used for 120 and 240. but again, you ain't gettin' 240 out of it.

 

[QES]

CODE
yes, 240 are not needed , 208 should be fine

 

[crossman]

Then bob is right!