load balancing 480V strip heaters

[mic]

I have never used line-line baseboard heaters before and am having trouble understanding load balancing.

I have a 10kVA single phase tx on A and B. I also require 4-2.5kW line to line heaters based on a heat load calculation. In the past we would use 277V heaters and improve the balance by putting the 4th heater on phase C (not used by tx).

With the 480V heaters I don't know how to proceed. 3 heaters would be easy - delta - but what do I do with the 4th.

Any help would be appreciated.

 

[coulter]

Re: load balancing 480V strip heaters

mic -

What's a "tx"? Ah wait - 1ph, 480/xxx xfmr - right?

If I understood your question correctly, what's wrong with putting two heaters on BC and two heaters on CA? That would put 5k on BC and 5k on CA, and up to 10k on AB. That's really a simplistic answer - makes me think there is more to your question than that.

carl

 

[charlie b]

Re: load balancing 480V strip heaters

That's the best balance you are going to get with four identical heaters.

 

[mic]

Re: load balancing 480V strip heaters

My apologies for not responding sooner, but with Christmas and all...

Thanks for the info. I guess I couldn't get past the Delta wiring to see the obvious.

Thanks again.

c