IDC Technologies Electrical Design Engineer Interview Questions, Process, and Tips

Circuit breakers are selected based on voltage, current rating, interrupting capacity, and application.

• Voltage rating should be equal to or greater than the system voltage

• Current rating should be selected based on the maximum current expected in the circuit

• Interrupting capacity should be sufficient to interrupt the maximum fault current

• Application-specific requirements such as environmental conditions and type of load ...read more

MCB, MCCB, and MPCB are circuit breakers used for electrical protection. They differ in their current ratings and trip characteristics.

• MCB stands for Miniature Circuit Breaker and is used for low current applications up to 125A.

• MCCB stands for Molded Case Circuit Breaker and is used for higher current applications up to 2500A.

• MPCB stands for Motor Protection Circuit Breaker and is used for protecting motors from overlo...read more

Calculation of cable size and busbar size is crucial for electrical design engineers.

• Cable size calculation involves determining the current carrying capacity of the cable and selecting the appropriate size based on the load requirements.

• Busbar size calculation involves determining the current carrying capacity of the busbar and selecting the appropriate size based on the load requirements.

• Factors to consider when calc...read more

The IP rating of a panel refers to its level of protection against solids and liquids. Panels can be separated by physical barriers or electrical insulation.

• IP rating indicates the degree of protection provided by a panel against dust and water. Higher IP ratings offer better protection.

• Separation of panels can be achieved through physical barriers such as walls, partitions, or enclosures.

• Electrical insulation is anoth...read more