aldav53,
Suggest you do a Load Calc first (as already suggested), and submit it to the PoCo (Utility Power Company).
Do this so they can take into consideration the "Flicker Factor" for the Heat Pumps (if they are not already existing and running).
PoCo may upgrade the service feeders, and if necessary, increase the Transformer's size.
Your Client may have to pay for the feeder upgrade, but not the Transformer upgrade (unless the PoCo finds the flicker factor too excessive and the current load on the Transformer is less than 130%).
Definitely suggest load calcs are done - and maybe done "Heavy"
(higher than normal figures)
on one calc to compare the results.
Figure an ample "Future Load" value on each calc.
You may be fine with the currently used 200 Amp service (panel and / or service feeders).
Upgrade to 400 Amp size if necessary
(or Client demands it!).
Compare current load demand against projected demand, and see if panel / service feeders need to be upgraded.
If the service panel sucks, change it!
I have only used the Square D 400 Amp Residential Service Panel - the one which is a 320 Amp Continuous rated, uses cl 320 KWH Meter, and has (2) 200 Amp 2 Pole breakers (1 for remote Sub Panel, 1 for 200 Amp bus kit within the Panel Assembly).
Had no idea that any others existed (with a 400 Amp bus kit!).
Are these listed for EUSERC (sp??) usage?
Scott35
