We use MCCB not MCB for motor starters because MCCBs has capablity to drawout th

We use MCCB not MCB for motor starters because MCCBs has capablity to drawout the motor starting current which is 5-6 times the full load current of motor for 1sec.
Then why we use SDF in starter panel means MCC panels.
Pls reply if any one knows this answer.

Question Posted / rajusawant

1 Answers
2662 Views
I also Faced
E-Mail Answers

We use MCCB not MCB for motor starters because MCCBs has capablity to drawout the motor starting cur..

Answer / omer a.osman

What do you mean by SDF. I guess Star/Delta.
In this case, the starting current will be reduced & within 15 to 20 Sec. the Sytem will changed to Direct on line in running Condition by taking the full load current. Hence, the recommended MCCB rating as protective device to protect the feeders should not be less than the current carrying capacity & tripping current about 1.45In. However, the breaking Capacity of the MCCB is an essential factor.

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

Single line diagrams for star to delta and DOL starters.

0 Answers

Why the brushes used in dc machines are made of carbon not from other metal?

3 Answers

what is the setting of locked rotor in HT motor ? (answer expecting in percentage)

0 Answers

After fault clearing in Tr line, whether the Metering core of CT is comes to normal condition from saturation region & its works as a normal condition?

1 Answers

What happen when neutral point connected to core balance current transformer? (Neutral point of an alternator of a 180KVA DG. Neutral point connected to CBCT means enter to the CBCT)

0 Answers Great Eastern Energy Corporation Ltd,

Determine a suitable number of slors and conductors per slot for the starter 1 winding of a 3 phase, 3300 V. SO Hz 300 rpm alternator. The diameter is 2.3 m

0 Answers

Corona occurs between two transmission wires when they (a) are closely-spaced (b) are widely-spaced (c) have high potential difference (d) carry d.c. power

2 Answers Power Grid,

what is the VA(Volt-amphere)? define with calculation?

0 Answers

Why DG set is not installed in Terrace ??

0 Answers

Why 36 KV LA is used in 33 KV Line and 9 KV LA is Used in 11 KV Line

1 Answers APTransco, Bhel, Wipro,

At the time of 1st charging of transformer, there were huge inrush current, so why at that diffrential relay are not operated? Why?

3 Answers Adani,

Why the stator is rotated in ceiling fans not Rator?

3 Answers

For more Electrical Engineering Interview Questions Click Here