Author Archives: via Edvard

Instrument transformers – ABBInstrument transformers (ITs) are designed to transform voltage of current from the high values in the transmission and distribution systems to the low values that can be utilized by low voltage metering devices. There are three primary … Continue reading →

GE Watthour MeterPower measurement in AC circuits can be quite a bit more complex than with DC circuits for the simple reason that phase shift complicates the matter beyond multiplying voltage by current figures obtained with meters.What is needed is an … Continue reading →

Sizing of power cables for circuit breaker controlled feeders (part 2) Continued from article Sizing of power cables for circuit breaker controlled feeders (part 1) 2. Criteria-2 Continuous current capacity (Ampacity)This criterion is applied so that cross section of the … Continue reading →

Low voltage switchboard with circuit breakers (incomers, feeders) The following three criteria apply for the sizing of cables for circuit breaker controlled feeders:I. Short circuit current withstand capacityThis criteria is applied to determine the minimum cross section area of the … Continue reading →