Equipment Specs.
Equipment Specs.
Gar,
The equipment in question is a piece of kitchen euipment [coffee] The manufacturers literature indicates a 220V circuit, the engineer designed in a buck / boost xfmr. to achieve the 220V, [not sure if they were aware of the neutral at the time]. The approved equipment cut sheets indicate the equiment to require a 220V single phase branch ciruict with 2Ph, 1N, 1EG.
This would be from the panel 2-pole breaker [208V Lines A & B] + 1N & 1 EG, to
Buck xfmr. located at equipment 208V[A&B in] and 220V[C&D] out to receptacle.
The euqipment requries a neutral the 220V is for the heating elements, and the 120V connected L1 - to N with a small cap between the two lines [C & N] line C also serves as the phase conductor for the 120V to a control module for some valves, sensors. The neutral is not derived directly from the buck boost [auot xfmr. 208 / 240 primary with 12V secondary .750kVA].
I am not sure at the time of the design if it was known that the equiment requried the neutral [120V ciruict] and have not seen this before where the buck / boost was used in conjuction with a neutral not derived from the xfmr. from prevuious experience the buck boost was unsed strictly on single phase / three phase loads where no neutral was requried.