100+ Free T&T Wireman's Licence Exam Practice Questions

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Sample T&T Wireman's Licence Exam Practice Questions

Try these sample questions to test your T&T Wireman's Licence Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which Trinidad and Tobago standard is the primary code governing low-voltage electrical installations tested in the Wireman's Licence Examination?

A.TTS 171: Part 1 - Low Voltage Installations

B.TTS 171: Part 2 - High Voltage Installations

C.BS 7671 IET Wiring Regulations

D.NFPA 70 National Electrical Code

Explanation: The Wireman's Licence Examination is based on TTS 171: Part 1, the Trinidad and Tobago Electrical Wiring Code for Low Voltage Installations, together with T&TEC's Wiring for Light and Power. Part 1 (2015, 1st Revision) covers installations operating up to 600 V.

2What is the upper voltage limit of installations covered by TTS 171: Part 1?

A.230 volts

B.400 volts

C.600 volts

D.1000 volts

Explanation: TTS 171: Part 1 applies to low-voltage installations operating at or below 600 volts. Installations above this level fall under Part 2 (high voltage), and generation and distribution systems operated by T&TEC and IPPs are excluded.

3Which body administers the Wireman's Licence Examination in Trinidad and Tobago?

A.Trinidad and Tobago Bureau of Standards (TTBS)

B.Government Electrical Inspectorate Division (GEID)

C.Trinidad and Tobago Electricity Commission (T&TEC)

D.Board of Engineering of Trinidad and Tobago

Explanation: The Government Electrical Inspectorate Division (GEID) of the Ministry of Public Utilities administers the Wireman's Licence Examination. The Chief Electrical Inspector conducts a written examination based on TTS 171 and T&TEC requirements.

4What is the standard single-phase nominal supply voltage provided by T&TEC to residential customers?

A.115 volts

B.120 volts

C.230 volts

D.240 volts

Explanation: T&TEC supplies single-phase power at a nominal 230 V (50 Hz). A standard supply variation of plus or minus 6% is permitted under the Electricity Supply Rules, so the voltage may range roughly between 216 V and 244 V.

5What is the standard three-phase line-to-line voltage supplied by T&TEC?

A.208 volts

B.400 volts

C.415 volts

D.480 volts

Explanation: T&TEC supplies three-phase power at a nominal 400 V line-to-line, which corresponds to 230 V line-to-neutral (400 = 230 x sqrt 3). This 400/230 V four-wire system is standard for commercial and industrial low-voltage installations.

6The standard permitted voltage variation declared under the Electricity Supply Rules for T&TEC supply is approximately:

A.Plus or minus 2%

B.Plus or minus 6%

C.Plus or minus 10%

D.Plus or minus 15%

Explanation: The Electricity Supply Rules provide for variations of approximately six percent above or below the declared voltage. A wireman must allow for this tolerance when designing circuits, especially for voltage-drop-sensitive equipment.

7A purely resistive single-phase load draws 4.6 kW from a 230 V supply. What is the load current?

A.10 A

B.20 A

C.23 A

D.46 A

Explanation: For a single-phase load, I = P / V = 4600 W / 230 V = 20 A. With a resistive load the power factor is 1, so apparent power equals real power and no power-factor term is needed.

8What is the line current drawn by a balanced three-phase load of 18 kW at unity power factor on a 400 V supply?

A.15 A

B.26 A

C.45 A

D.78 A

Explanation: For a balanced three-phase load, I = P / (sqrt 3 x V_L x pf) = 18000 / (1.732 x 400 x 1) = 18000 / 692.8 = 26 A. The square root of three accounts for the relationship between line and phase quantities.

9A circuit directory (panel schedule) is required in an installation primarily to:

A.Record the manufacturer of each appliance

B.Identify and label the load served by each circuit breaker

C.List the colour of every cable used

D.Show the utility account number

Explanation: A circuit directory clearly identifies the area or load served by each protective device in the distribution board. This allows safe isolation, maintenance and fault-finding, and is a requirement for inspection approval under TTS 171 and T&TEC practice.

10When preparing a load schedule for a distribution board, the total connected load is used together with a demand factor to determine the:

A.Maximum demand used for sizing the main and service

B.Colour coding of conductors

C.Earth electrode resistance

D.Conduit support spacing

Explanation: Applying a demand (diversity) factor to the total connected load gives the maximum demand, which determines the size of the main breaker, service conductors and T&TEC service connection. Not all loads operate simultaneously, so diversity prevents oversizing.

About the T&T Wireman's Licence Exam Exam

The Wireman's Licence Examination is the assessment required to be awarded a Wireman's Licence in Trinidad and Tobago, allowing the holder to perform or supervise electrical building works. Administered by the Government Electrical Inspectorate Division, it is a written examination and interview based on TTS 171: Part 1 (low voltage installations up to 600 V) and T&TEC's Wiring for Light and Power, covering design, cable sizing, voltage drop, conduit fill, breaker sizing, earthing and safety.

Assessment

A written examination and interview conducted by the Chief Electrical Inspector, based on TTS 171: Part 1 (Low Voltage Installations) and T&TEC Wiring for Light and Power. Questions cover LV system design, circuit directories, load details, conduit factor, voltage drop, cable sizing, breaker sizing, paralleling of cables, earthing and safety.

Time Limit

Determined by the Government Electrical Inspectorate at the scheduled interview.

Passing Score

No fixed published pass mark; the Chief Electrical Inspector evaluates competence through the written examination and interview. Only on successful completion is the licence awarded.

Exam Fee

Licence and inspection fees are set by the Government Electrical Inspectorate and payable on successful completion. Confirm current amounts via ttconnect or the Ministry of Public Utilities. (Government Electrical Inspectorate Division (GEID), Ministry of Public Utilities, Trinidad and Tobago)

T&T Wireman's Licence Exam Exam Content Outline

16%

TTS 171 and T&TEC Regulations

Scope of TTS 171 Part 1 up to 600 V, circuit segregation, enforcement by the Chief Electrical Inspector, T&TEC Wiring for Light and Power, inspection certificates and licensing.

15%

Installation Design and Load Schedules

Circuit directories, load details, maximum demand and diversity, single-line diagrams, feeders, sub-circuits and main switches.

15%

Cable Sizing and Derating

Ampacity, ambient-temperature and grouping derating, armoured and ECC cables, neutral sizing and paralleling of conductors.

12%

Voltage Drop

Single and three-phase voltage-drop formulae, the 3% branch and 5% total limits, and conductor sizing for compliance.

10%

Conduit Fill and Conduit Factor

Fill percentages of 53%, 31% and 40%, conduit-factor calculations, bends and cable pulling.

12%

Breaker Sizing and Protection

Conductor protection, the 125% continuous-load rule, discrimination, breaking capacity, motor inrush and earth-fault loop impedance.

12%

Earthing and Bonding

Earthing versus bonding, the 1-ohm grounding requirement, main earthing terminal, equipotential bonding and conduit continuity.

Electrical Theory and Safety

Ohm's law, single and three-phase power, power factor, transformers, safe isolation, PPE, RCDs and inspection and testing.

How to Pass the T&T Wireman's Licence Exam Exam

What You Need to Know

Passing score: No fixed published pass mark; the Chief Electrical Inspector evaluates competence through the written examination and interview. Only on successful completion is the licence awarded.
Assessment: A written examination and interview conducted by the Chief Electrical Inspector, based on TTS 171: Part 1 (Low Voltage Installations) and T&TEC Wiring for Light and Power. Questions cover LV system design, circuit directories, load details, conduit factor, voltage drop, cable sizing, breaker sizing, paralleling of cables, earthing and safety.
Time limit: Determined by the Government Electrical Inspectorate at the scheduled interview.
Exam fee: Licence and inspection fees are set by the Government Electrical Inspectorate and payable on successful completion. Confirm current amounts via ttconnect or the Ministry of Public Utilities.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

T&T Wireman's Licence Exam Study Tips from Top Performers

1Master the core calculations first: single and three-phase power, voltage drop (2 x I x R for single phase, sqrt 3 x I x R for three phase), conduit fill percentages (53/31/40) and the 125% continuous-load rule, as these recur throughout the exam.

2Study TTS 171: Part 1 and the T&TEC Wiring for Light and Power handbook side by side, focusing on scope (up to 600 V), segregation of circuits, earthing requirements (the 1-ohm grounding rule) and inspection and testing procedures.

3Practise preparing a complete circuit directory, load schedule and single-line diagram for a sample installation, and be ready to calculate inspection fees and size the service, feeders and sub-circuits.

Frequently Asked Questions

Who administers the Trinidad and Tobago Wireman's Licence Examination?

The Government Electrical Inspectorate Division (GEID) of the Ministry of Public Utilities administers it. The Chief Electrical Inspector conducts a written examination and interview, and only on successful completion is the licence awarded.

What is the examination based on?

It is based on the Trinidad and Tobago Bureau of Standards code TTS 171: Part 1 (Low Voltage Installations, covering systems up to 600 V) and on T&TEC's Wiring for Light and Power, together with health-and-safety and practical design topics such as load details, conduit factor, voltage drop, cable sizing and breaker sizing.

How long is a Wireman's Licence valid?

A Wireman's Licence in Trinidad and Tobago is valid for two years and must be renewed to remain valid. A licensed wireman performs or supervises electrical building works and jointly applies for electrical inspections with the property owner.

Do I need a prior qualification to sit the exam?

Candidates are generally required to be pursuing or to have completed a recognised electrical qualification such as a City and Guilds or National Examination Council (NEC) Diploma in Electrical Installation, or a degree in electrical engineering, before sitting the GEID examination.