Electrical QA/QC Inspector Interview Question Answers.

 Electrical QA/QC Inspector Interview Question Answers.

This resource provides a concise collection of common Electrical Quality Assurance/Quality Control (QA/QC) interview questions and their answers, designed to help candidates prepare effectively. It covers key topics such as electrical standards, testing procedures, quality control processes, safety regulations, and troubleshooting techniques. Each question is paired with a clear, practical response to demonstrate technical knowledge and problem-solving skills essential for roles in electrical engineering and quality management. Ideal for professionals aiming to excel in QA/QC interviews within the electrical industry.

1. What is the test for electrical cable?

A: IR and Continuity Test( HIPot Test for MV Cables)

2. What is the difference b/w cable & wire?

A: A wire is signal conductor and cable is bundle of wires which surrounded by an insulation sheath.

3. What are the parts of cable?

A: Conductor, insulation, Inner sheath, armored, PVC outer sheath.

4. What are the differences b/w XLPE & PVC?

A: XLPE is used for High & Low Tension, and PVC is used for low tension.

5. What are the two international standards for cable?

A: IEC & NEC.

6. What is the temperature rating for cable?

A: As per SAES-P-104 (NEC 600/100V 90% Dry/ 75% wet and IEC 85%, 450/750 IEC 70%).

7. What type of cable can be used in an exposed location?

A: Armored & Metal clad.

8. What is the voltage rating for LV, MV cables?

A: LV below 1kv and MV below 35kv.

9. What is the SAMSS for a power cable?

A: 15-SAMSS-502

10. What is the SAES for a power cable?

A: SAES-P-104

11. How much voltage do we inject for LV/MV cable?

A: As per Pre-commissioning Form-000 From 100 to 250 = 500 251 to 600 = 1000 601 to 5000 = 2500 over 5000 = 5000.

12. For how long can we inject voltage for LV/MV cable? why?

A: One Minute DC, we inject for LV 1kv and 5kv for MV (hi-pot for 15 minutes) to check the insulation of Cables.

13. What is the minimum resistance for the LV test? As per which standard?

A: 50 megaohms NETA ATS

14. Do we use AC or DC for the megger test? Why?

A: AC is not giving a perfect value, and DC is giving a perfect value.

15. What are the components in the megger device?

A: digital meter, wire leads, discharge stick, selection switch.

17. What is the max cable bend for LV cable?

A: As Per NEC Article 300(Non-shielded Cable 8*Cable Dia & Shielded Cables =12*Cable Dia).

18. What is the color-coding for a power cable?

A: AC= Black & white , DC= Red , white

19. How do you select the cable size?

A: As per SAES-P-104 Table-01

20. How many times will you test the cable?

A: two meggers & one time HI-Pot.

21. What are the tests required for a transformer during pre-commissioning?

A: Winding Resistance test.
Winding Insulation Test.
Turn Ratio test.
PI.
Taping Setting.
Distance Phase to Phase.
Lightning arrestor.
Core to Grounding & Tank to Grounding.
Pressure Relief Devices.
Check tightness as per the manufacturer's recommendation.