A squirrel cage motor on a VFD suits most crane hoists. Slip ring motors still win where crushers, mills and deep hoists need high torque at low current.
Vacuum or SF6 circuit breaker at 11, 22 and 33 kV? The EU F-gas ban dates, SF6 GWP, VCB proof at 33 kV, and what to do with the SF6 switchgear you own.
Arc flash in MV switchgear: why IAC containment cannot be retrofitted, how fast arc sensing clears a fault, and which upgrades an older lineup can take.
How to megger test a motor before energising: test voltage by rating, correction to 40 deg C, IR minimums, PI ratio, and why low readings mean moisture.
How APFC panels cut an industrial electricity bill: power factor surcharge, kVA demand, kVAR sizing, harmonic limits and why capacitor banks fail early.
Size on maximum demand, not connected load. How demand and diversity factors, IS 1180 loss ceilings and the largest motor decide the kVA rating you need.
Zone, gas group and temperature class decide the motor, not the other way round. Why Ex d is not a Zone 0 answer, and what a quotable enquiry must state.
