Mains voltage in US
Mains voltage in US
(OP)
Our company manufactures pasteurizers and we want to make a US version.
The standard european version uses 230V for the control circuit and 400V for the 3ph heater.
Now we want to make a sample 120V/208V, 60Hz version.
Live and neutral will be used to get 120V and the voltage between 2 phases is 208V.
Is it correct?
I have also seen that in some areas there also 220V, 60Hz single phase voltage present.
The standard european version uses 230V for the control circuit and 400V for the 3ph heater.
Now we want to make a sample 120V/208V, 60Hz version.
Live and neutral will be used to get 120V and the voltage between 2 phases is 208V.
Is it correct?
I have also seen that in some areas there also 220V, 60Hz single phase voltage present.





RE: Mains voltage in US
Lots of dairies are rural and will have 240 whereas new development and light industry areas would have the 208V. I could see milk processors in urban areas being in heavy industry areas because of the truck traffic delivering the milk so that would point to 240V also.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Mains voltage in US
240 Volt delta systems often have one of the phases center tapped (with the center tap grounded) to provide the standard 120/240 Volt single phase as well as 240 Volt three phase. One phase then has a higher voltage to ground than the other two and is called the "wild" phase. The wild phase is used only for three phase loads.
Bill
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"Why not the best?"
Jimmy Carter
RE: Mains voltage in US
"Will work for (the memory of) salami"
RE: Mains voltage in US
The main concern is the heater.
The standard heater is resistive 12KW wired in star connection for 3ph 400V.
Practicaly they can be considered as 3 single phase heating elements of 4KW each.
RE: Mains voltage in US
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Mains voltage in US
RE: Mains voltage in US
A 4 kW heater on 208 Volts will be about 11 Ohms.
A 4 kW heater on 240 Volts will be about 14.4 Ohms.
How about 11 Ohm heaters in series with 4.4 Ohm heaters.
The unit could then be connected for either 208V or 240 V.
A 208:240 Volt transformer connected across 208 Volt taps will give 240 Volts for control, regardless of the supply voltage.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Mains voltage in US
We are considering the 208/240V version for both heater and control circuit.
The heating will be slightly slower when connected to 208V but it's will not be a problem.
We can't find a circulator pump at 110V from any supplier here so we will probably have to get 240V version.
I also have few contactors and coils.
In case I decide no to use 110V for the control circuit but 208/240V, which seems more reasonable and simple, can the same contactor be used for both 208/240V or the coil is going to fail?
RE: Mains voltage in US
Motors rated at 208/230:460 Volts are available.
Bill
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"Why not the best?"
Jimmy Carter