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Many thanks for all explanations, There is conflict between contract obligations, budget limitation and technical requirements. So i will request a deviation to the specification, to omit CT and the field ammeter or extra cost for high accurate local metering via VFD output.

Many thanks for all explanations. Kindly note, there is one motor on each VFD. As per project specifications, Local Control Station (LCS) will have Start/Stop push buttons, Local/Remote selector switch and an AC ammeter without any power supply. One multi-core cable from LCS to LV MCC has been...

Hi everybody; There are several 400V, 3Ph, induction motors equipped with Variable Speed Drive (VFD) mounted in LV MCC room. The output frequency in normal operation of the motors will be about 20Hz~50Hz. I want to buy/finalize Ammeter to be mounted in Local Control Station (LCS) of the...

IP test is not a routine test for an enclosure. So you can request and review the IP test certificate of the similar enclosure done by authorized laboratories. About purchased one, do the visual checks on door sealing, cable entries, door mounted equipment, ...

Ni-Cd batteries Hydrogen gas emission is considerably less than Lead-Acid batteries. Also Ni-Cd batteries are better choice because of their long life time, reliability and low maintenance cost. I'm agree with ScottyUK about Ni-Cds enormous cost and smaller size with respect to Lead-Acids.

http://www.eupen.com/highlights/a-z.html, http://www.kerpen-industrial.de/KERPEN_INDUSTRIAL/00006_00000.htm

curlis19 calculation is corect if 230V is the line-to-line voltage. But if 230V is the phase voltage, line-to-line voltage will be 400V and the current (I) will be 10.1A i.e. 7000/(sqrt(3)/400).