DEWA Electrical License Test Questions and Answers – Complete Guide

Getting a DEWA electrical license is essential for professionals who want to work on electrical installations in Dubai. The Dubai Electricity and Water Authority (DEWA) ensures that only qualified individuals and companies handle electrical projects to maintain safety and quality standards. Passing the DEWA electrical license test is a major step in this process. This article provides a detailed overview of DEWA electrical license test questions and answers, offering insights, sample questions, technical guidelines, and practical tips.

If you are an engineer, contractor, or technician aiming to get certified, understanding the format and content of the exam is critical. The test covers electrical design, safety standards, DEWA regulations, and practical scenarios. Many candidates fail because they underestimate the depth of the questions or lack proper preparation.

Before we dive into the DEWA electrical license test questions and answers, let’s highlight the core purpose of the test. It evaluates your knowledge of international and local electrical codes, load calculations, fault protection, earthing systems, and DEWA-specific guidelines. Passing the exam demonstrates that you can ensure electrical safety and compliance in all projects.

Key Takeaways

• The DEWA electrical license test assesses technical knowledge, safety, and compliance with DEWA standards.
• Most questions revolve around IEC codes, cable sizing, fault current calculation, earthing, and protection systems.
• Practice with real DEWA electrical license test questions and answers to increase success chances.

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Understanding the DEWA Electrical License Test

The test is structured to check your practical knowledge, problem-solving ability, and understanding of DEWA regulations. It applies to professionals seeking licenses in categories such as LV (Low Voltage) contractors, electrical engineers, and technical supervisors.

The exam format generally includes:

• Multiple Choice Questions (MCQs): Focused on theory and standards.
• Practical Calculation Problems: Cable sizing, load balancing, and fault level determination.
• Scenario-Based Questions: Safety measures and regulation compliance.

Eligibility and Requirements

To sit for the DEWA electrical license exam, you need:

• A valid engineering or technical qualification in electrical engineering.
• Minimum work experience as per DEWA requirements.
• Knowledge of IEC standards and DEWA regulations.

Why Are DEWA Electrical License Test Questions Important?

Practicing DEWA electrical license test questions and answers helps candidates understand the exam format and difficulty level. These questions cover essential topics such as:

• Electrical design principles
• Load calculation and diversity factor
• Short circuit analysis
• Earthing and grounding methods
• DEWA safety codes

When you solve sample questions, you improve speed and accuracy. You also identify weak areas that need extra attention.

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Structure of DEWA Electrical License Test Questions and Answers

The test usually consists of 50–100 questions, and you must score at least 70% to pass. Below is a breakdown of the main topics:

Sample DEWA Electrical License Test Questions and Answers

Here are some real-world style questions for practice:

Question 1:

What is the permissible voltage drop in an LV installation as per DEWA regulations?
A) 2%
B) 3%
C) 4%
D) 5%

Answer: B) 3%
Explanation: DEWA guidelines recommend a maximum voltage drop of 3% for lighting circuits and 5% for power circuits.

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Question 2:

Which IEC standard is applicable for electrical installations in buildings?
A) IEC 60364
B) IEC 60947
C) IEC 60228
D) IEC 61008

Answer: A) IEC 60364
Explanation: IEC 60364 deals with the design and installation of electrical installations in buildings, which is followed by DEWA.

Question 3:

Calculate the size of the cable required for a 50 kW load at 415 V, 3-phase, with a power factor of 0.9 and efficiency of 95%.
Answer:
Current = P / (√3 × V × PF × Efficiency)
= 50,000 / (1.732 × 415 × 0.9 × 0.95)
= 76 A approx.
Using DEWA cable selection charts, a 25 mm² copper cable is suitable for this load.

Question 4:

What is the fault current for a transformer rated at 1000 kVA, 11 kV/0.415 kV with 6% impedance?
Answer:
Fault current = Transformer Full Load Current / Impedance
Full Load Current (LV side) = 1000 × 1000 / (√3 × 415) = 1391 A
Fault Current = 1391 / 0.06 ≈ 23,183 A

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Technical Insights for the DEWA Exam

To answer DEWA electrical license test questions and answers effectively, you need strong technical understanding. Here are the most important areas:

1. Cable Sizing

Cable selection depends on current rating, derating factors, voltage drop, and installation method. DEWA uses IEC-based charts, and factors such as ambient temperature and grouping correction must be considered.

2. Earthing & Grounding

DEWA requires TN-S system for LV networks. The earth electrode resistance should not exceed 1 ohm. Protective earthing conductors must comply with IEC 60364-5-54.

3. Short Circuit Calculation

Short circuit analysis ensures correct sizing of breakers and busbars. DEWA follows IEC 60909 guidelines for fault current calculation.

4. Protection Devices

Circuit breakers must have adequate breaking capacity based on calculated fault levels. Selectivity and discrimination between devices are mandatory for safety.

5. Load Calculation

Apply diversity factors and maximum demand when calculating load. For residential projects, DEWA typically considers diversity for air conditioning loads.

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Tips to Prepare for DEWA Electrical License Exam

• Study IEC Standards: Focus on IEC 60364 and IEC 60947 series.
• Learn DEWA Regulations: Download DEWA’s latest Electrical Installation Regulations PDF.
• Practice Calculations: Cable sizing, fault level, and voltage drop are critical.
• Use Previous Questions: Go through as many DEWA electrical license test questions and answers as possible.
• Understand Safety Codes: Earthing, insulation resistance, and circuit protection rules are frequent exam topics.

Common Mistakes to Avoid

• Ignoring voltage drop calculations.
• Not applying correction factors for temperature and grouping.
• Confusing IEC standards with NEC (National Electrical Code).
• Overlooking DEWA-specific requirements for metering and LV panels.

More Sample Questions for Practice

Question 5:

What is the minimum insulation resistance required for LV circuits in DEWA standards?
Answer: 1 MΩ at 500 V DC test.

Question 6:

What type of earthing system is used in Dubai LV networks?
Answer: TN-S system.

Question 7:

What is the typical diversity factor for residential apartment lighting?
Answer: Around 0.8 to 0.9 depending on the load type.

Final Thoughts

Passing the DEWA electrical license test requires both theoretical knowledge and practical experience. Practicing with real DEWA electrical license test questions and answers is the best way to prepare. Make sure to review IEC standards, DEWA regulations, and practice numerical problems regularly.

A well-prepared candidate not only clears the exam but also ensures compliance and safety in all electrical projects.

Quick Reference Table for Important Standards

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