HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL
& in dol why it is require circuit breaker?
Answers were Sorted based on User's Feedback
Answer / x man
for OLR---It has to be Motor full oad current
for Contactor--it has to be 1.5 timmes the motor rated
Circui breaker is used to protect the circuit.
for A tYPR 2 cordination these three componenrs are needed
in the circuits
|Is This Answer Correct ?||13 Yes||6 No|
Answer / ermias solomon
in OLrelay 115%*motor name plate current
for contactor use
NEMA table by ermias solomon
|Is This Answer Correct ?||1 Yes||1 No|
Answer / christopher pino
Refer to NFPA 70 - NEC 2005 (Article: Motor Protection) for
sizing and other consideration.
|Is This Answer Correct ?||1 Yes||3 No|
Answer / barkha
In case of DOL Starter overload relay range depend on full
load current(flc) of the motor it is 2-3 times of flc &
also keep in mind the fuse rating of the motor
|Is This Answer Correct ?||11 Yes||15 No|
Answer / nikhil chugh
THE CONTACTOR RATING SHOULD BE 3.5 TIMES GREATER THEN THE
MOTOR CURRENT RATING FOR SMOOTH RUNNING OF THE MOTOR WITH
|Is This Answer Correct ?||1 Yes||5 No|
Answer / k.suresh
motor full load ampes & 6 time higher select OLR AND
|Is This Answer Correct ?||11 Yes||27 No|
do anyone out there know where to find a compleete list on acronyms/abbreviations used in offshore electric engineering. MCB - Micro Circuit Breaker, MCCB-Mouldes Case Circuit Breaker, ELCB-Earth Lekage Circuit Breaker, ELMCB- etc.....
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