Delta Construction Co. W.L.L Electrical Project Engineer Interview Questions, Process, and Tips

The rating of ELCB and MCCB in a distribution board for power circuits should be based on the load requirements and safety regulations.

• ELCB rating should be based on the maximum fault current that can occur in the circuit to ensure proper protection against electrical shocks.

• MCCB rating should be selected based on the maximum current that the circuit can handle without tripping.

• Consider the type of load connected to th...read more

The MCB rating for cooker unit in villas and flats should typically be around 32A.

• The MCB rating for a cooker unit is usually 32A to handle the load of the cooker.

• It is important to consider the power consumption of the cooker and any other appliances connected to the same circuit.

• Consulting with an electrician or following local electrical codes can help determine the appropriate MCB rating.

• Using a higher MCB rating t...read more

The rating of ELCB in the swimming pool distribution board for underwater lights and swimming pool lights should be at least 30mA.

• The ELCB rating should be at least 30mA to provide protection against electric shock in wet conditions.

• This is important for safety in swimming pools where the risk of electric shock is higher.

• ELCBs with higher ratings such as 100mA or 300mA may not provide adequate protection in wet environ...read more

The number of power sockets that can be connected in a 1no ring main circuit in a Distribution board depends on the load capacity and design of the circuit.

• The number of power sockets will depend on the load capacity of the circuit.

• Consider the power rating of each socket and the total load that the circuit can handle.

• Consult electrical regulations and guidelines for maximum allowable load on a ring main circuit.

• Factor...read more

Yes, a shunt trip is required for Smoke Extract Fan Panel.

• A shunt trip is required for Smoke Extract Fan Panel to ensure the fan can be shut off remotely in case of emergency.

• It is a safety feature that allows for quick deactivation of the fan in case of fire or smoke detection.

• Without a shunt trip, there may be delays in shutting off the fan during an emergency situation.

The wire size installed in the Distribution board for lighting circuits is typically 1.5mm² or 2.5mm².

• Typically, 1.5mm² or 2.5mm² wire sizes are installed in the Distribution board for lighting circuits.

• The wire size is chosen based on the current rating and load requirements of the lighting circuit.

• Proper wire sizing is crucial to ensure safety and prevent overheating in the electrical system.

For a load less than 20 kW in a 3 phase Distribution board, a main incomer MCCB of 32A and a cable size of 6mm should be given.

• Main incomer MCCB size should be 32A for a load less than 20 kW in a 3 phase Distribution board

• Cable size should be 6mm for the Distribution board from the panel

Traffic barrier system can be integrated with Fire Alarm System to provide early warning and evacuation signals in case of fire.

• Traffic barrier system can be equipped with fire alarm sensors to detect smoke or fire.

• Once fire is detected, the barrier system can automatically open to allow for evacuation of vehicles and people.

• The barrier system can also trigger alarms and flashing lights to alert nearby individuals of t...read more

Yes, galvanised cable tray and cable trunking should be earthed for safety reasons.

• Galvanised cable tray and cable trunking should be earthed to prevent electric shock hazards.

• Earthing helps in dissipating any fault currents that may occur in the system.

• It also helps in protecting the equipment and personnel from potential electrical faults.

• Proper earthing ensures the system meets safety standards and regulations.

• Examp...read more