Macmet Engineering Design Manager Interview Questions and Answers for Experienced

SCCR stands for Short-Circuit Current Rating.

• SCCR is a measure of the maximum amount of current that a device or system can safely withstand during a short circuit.

• It is an important consideration in electrical design to ensure the protection of equipment and personnel.

• SCCR is typically expressed in amperes (A) and is determined through testing or calculations.

• It helps in selecting appropriate protective devices such a...read more

OLR setting in a star-delta connection determines the transition point between star and delta mode.

• OLR stands for Overload Relay.

• In a star-delta connection, the motor is initially started in star mode to reduce the starting current.

• After a certain time, the motor is switched to delta mode for normal operation.

• The OLR setting determines the current threshold at which the transition from star to delta occurs.

• The OLR sett...read more

HRC fuse stands for High Rupturing Capacity fuse. It is a type of fuse that is designed to safely interrupt high fault currents.

• HRC fuse is used in electrical systems to protect against overcurrents and short circuits.

• It has a high breaking capacity, which means it can safely interrupt high fault currents without causing damage.

• The fuse contains a fuse element made of a material that can withstand high temperatures and...read more

The two earthing terminals in a motor provide redundancy and ensure safety in case of a fault.

• The first earthing terminal is connected to the motor frame, providing a path for fault current to flow and preventing electric shock to personnel.

• The second earthing terminal is connected to the motor winding, providing a path for fault current to flow and protecting the motor from damage.

• Having two earthing terminals ensures...read more