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  • Users: Brant
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  1. Brant

    Cable selection for AC induction motor starting

    Hi All. Can any one help is there any articles written on cable selection to reduce voltage drop in supply cables to a large 3 phase motor i.e. 250 Kw 4 pole 415 volt 50/60 Hz i.e. to help reduce the voltage during a fully loaded start (basic rules & guide lines)
  2. Brant

    Intermittent tripping over Merlin Gerin Masterpact circuit breaker

    I have an MG masterpact 2000 amp 415 volt 50 Hz 3 pole circuit breaker fitted with a STR 58U trip unit. The unit was carrying about 1000-1200 amps at the time of the trip? It is a stand-alone unit with no external trip circuits. It has tripped on several occasions with no apparent cause. The...
  3. Brant

    auto transformer motor starters

    Is there a formula or rule of thumb to work out the starting times (auto trany in circuit) to suit motor size (kw) Best regards Brant
  4. Brant

    testing motor direction

    I have been asked a question on motor rotation dose anyone know of a test the can tell the direction a motor will rotate when it is conected to a 3 phase supply with a known phase rotation (motor leads not marked)the question was asked to aviod starting large drive the wrong direction when...

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