HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in d

Categories >> Engineering >> Electrical Engineering
Suggest New Category

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL
STARTER?
& in dol why it is require circuit breaker?

Question Posted / ram

6 Answers
20032 Views
DLF, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require..

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
current.
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

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require..

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

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require..

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

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require..

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

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require..

Answer / nikhil chugh

THE CONTACTOR RATING SHOULD BE 3.5 TIMES GREATER THEN THE
MOTOR CURRENT RATING FOR SMOOTH RUNNING OF THE MOTOR WITH
PANEL

Is This Answer Correct ?

1 Yes

5 No

HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL STARTER? & in dol why it is require..

Answer / k.suresh

motor full load ampes & 6 time higher select OLR AND
Contactor.

Is This Answer Correct ?

11 Yes

27 No

Post New Answer

More Electrical Engineering Interview Questions

Why High voltage are generate noise ?

0 Answers

what is a FACTS devices? what is mean by STATCOM????

1 Answers IIT,

Difference between split ac and cassete ac?

1 Answers

Can we put 3 layers of cable tray while installing tray

0 Answers NTPC, Siemens,

How can Inductive load reduce the line voltage of HV transmission line and vice versa Capacitive load?

1 Answers

how to calculate the transformer losses.

4 Answers Cipla,

if we have to design a small transformer of rating 1 kva or 1 mva , how can we design it?

1 Answers

why an ac solenoid valve attract the plunger eventhough we interchanges the terminal?will the ploes changes?

1 Answers

Why effective AC resistance is more than DC resistance of a transmission line?

9 Answers HCL, ONGC,

DOES A MAGNETIC CIRCUIT CONSUMES ENERGY? IF YES, WHY?

6 Answers

what is different between phase and netural

0 Answers

If we increase frequency in transmission line in lieu of voltage what will happen?

1 Answers

For more Electrical Engineering Interview Questions Click Here