Answer / venu

As per thumb rule the current rating of a motor working at
415vac
equals to double the KW rating (and -2% of double the KW)

Answer / shahid

Thumb rule to calculate the current of all d LT ac motors
is:

A = 1.7*KW

Answer / azarudeen

Above 40A (if efficiency of motor - 90% & PF - .8)

FORMULA: I = (HP*746)/(1.732*415*Eff*PF)

Answer / dheeraj soni

As per thumb rule motor working at 415 ac their current
rating is aprroximately 1.5 times of its HP Rating

Answer / arsenal

actually how is the thumb rule obtained......is there any
derivation.........

Answer / yogender goel

As per the Thumb Rule,

Current = (Motor HP x 1.5)-10% of the total

Example: If we want to calculate the current of the 100Hp
motor then
current = (100 x 1.5)-10% = 150-15 = 135 Amp.

Answer / m. madhu sudhanarao

As per thumb rule Motor current rating at 415AC is
approximately 1.6times the KW rating.

How to find Cable size? Caterpillar generator produce (Two generators) 127*2=254 amp at 11 kv . What would be the cable size (XLPE) to supply 256 amp at 11 kv? Air or surrounding Temperature is 32 degree C. Cable will go under ground at 2.5 feet depth. Group Rating Factors is 3 cables. Clearance between cables is 7 cm. Soil Temperature (Ambient) 28o C Soil Thermal Resistivity is 1.2 K.m/W I would like to use 3 separate single core instead of using 3 core cable. Some says I should use three separate single core 120RM cables. Some says 70RM .some says 95. I m totally confused. Is there ant specific rule to determine cable size? What would be the LT cable size to flow 500 Amp current? Ifte My e mail address is ifte13@yahoo.com Anyone please send me the answer to my e mail address, i will be very glad.

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