Masteraria power mains sizing

By Anonymous -
All Masteraria Panels both the ones that accommodate fans with motors up to 5,5 Kw motors (CM00006125) and the ones that can accommodate fans up to 15 Kw motors (CM000006148), have the same identical Main Disconnect Switch which can hold up to 125Amps of current MAX (which is a lot).
The reason why we have introduced such a big disconnect switch is because we tried to squeeze inside the available space of the electrical panel box the largest disconnect switch that could possibly fit so that we would have allowed the AHU Manufacturer using our panels to source as much power as possible from the extra terminals.
The power input to the electrical panel and the protections upstream, do not have to be necessarily this big (125 amps), but can be smaller depending on the specific fan motor sizes connected to the specific Electrical Panel, plus any eventual extra power sourced from the extra terminals.
For example, if you have a supply fan of 3 Kw, an extract fan of 1.5 Kw and a condensing unit absorbing 30 Kw of electricity from the extra terminals, you will have to size the mains to the control panel counting 3 Kw+1,5Kw+30 Kw = 34,5 Kw. Normally the mains protections and cables are oversized of about a 30%, however this may differ from application to application but is certainly regulated by the electrical norms in vigor in the UE with which all electricians are very familiar with. They should know. The important is that they are informed that the power input has to match the total power absorbed by the AHU (which is the total current absorbed by the fan motors plus a possible heat wheel or Run around pump from the single phase contactor plus any auxiliary power supplied to other field devices (Electric Heater Boxes, Humidifiers, Condensing Units etc…) though the auxiliary terminals inside the panel. Please note that any of these devices, when powered from the Masteraria, must not be more than 3 meters away from the AHU control panel.

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