Assessment Test for Applicants for an Electrician’s Licence - List of Typical Technical Questions

Sep 30, 2026

Upload by Sarah

Written assessment material for candidates applying for an electrician’s licence, requiring both a written test and an interview. The document provides a non-exhaustive list of typical technical questions covering general requirements and practical electrical testing topics. Areas include residual current circuit breaker checks, insulation resistance and continuity tests, earth resistance and loop impedance testing, polarity and phase rotation verification, earthing system types, and installation testing for domestic premises. It also includes design and wiring requirements such as single-line diagrams, concealed wiring depth limits, and decorative lighting safety.

LanguageEnglish

CategoryExam

FormatPDF

Pages8

Reading Time20 min

AccessFree to download

General Requirements

Typical Technical Questions

Electrical Installation Design

Assessment Test for Applicants for an Electrician’s Licence1 Applicants for an electrician’s licence are required to attend a written assessment test and an interview. The list of typical technical questions that the applicants would be assessed on is appended below for reference. It is to be noted that the list of technical questions is non-exhaustive. The applicants will have to acquire the knowledge and experience relevant to the electrical work which an electrician is authorised to perform. 1 Disclaimer EMA shall not be responsible or liable for any consequences (financial or otherwise) or any damage or loss suffered, directly or indirectly, by any person resulting or arising from the use of or reliance on any information contained in this document. List of Typical Technical Questions That Applicants for An Electrician’s Licence Would Be Assessed On | | | | --- | --- | | | General Requirements | | 1 | What is the nominal voltage and frequency and the respective percentage variations of low voltage electricity supply in Singapore? | | 2 | Describe the procedure and safety precaution to be taken to conduct tests on a residual current circuit breaker having a 30mA sensitivity ina residential premises. | | 3 | What is the required tripping current and tripping time of a residual current circuit breaker (RCCB) for use in a domestic electrical installation? | | 4 | Describe the procedure and safety precaution to be taken to conduct insulation resistance tests on an electrical switchboard / DB with the circuits connected. What is the required minimum insulation resistance value for a new switchboard under SS CP 5? | | 5 | Describe the procedure to conduct earth resistance test for a new electrical installation before connecting to grid supply. | | 6 | Describe the procedure and safety precaution to be taken to carry out troubleshooting when the insulation resistance values measured between the Neutral terminal and the Earth terminal at a consumer unit are below 0.5 Mega Ohm. | | 7 | What is the minimum acceptable insulation resistance value of an existing electrical installation? | | 8 | Describe the procedure and safety precaution to be taken to conduct continuity test on an electrical circuit in an electrical installation. | | 9 | Describe the steps involved in conducting tests on a ring circuit for switched socket-outlets. | | 10 | What is the purpose of conducting polarity test on a final circuit in an electrical installation? Describe the steps in conducting such test for alighting circuit and a switched socket-outlet circuit including the instruments and tools to be used. | | 11 | What is the disadvantage(s) of using a checker-plug? | | 12 | What is the difference between a type C and a type D miniature circuit breaker? | | 13 | Describe the procedure and safety precaution to be taken to conduct phase rotation test on an electrical installation. If the incoming service cable from the building’s tap-off point is found to be in wrong polarity, what should be done next before you change the connection of the incoming service cable? | | 14 | What are the acceptable types of the earthing system for a permanent electrical installation? Illustrate their differences with a diagram. | | 15 | What is the type of the earthing system to be used for an electrical installation to take electricity supply directly from the low voltage grid network? | | 16 | How do you carry out the earth resistance test? | | --- | --- | | 17 | How do you determine the setting of an earth leakage relay of a 60-Amp 400Va.c. main switchboard during the turn-on of an electrical installation if the electricity supply of the electrical installation is drawn from SP PowerGrid’s low voltage distribution network ? | | 18 | Describe the procedure and safety precaution to be taken to conduct earth fault loop impedance test on a new electrical installation after turn-on of electricity supply. | | 19 | What is the minimum height for installing a switche

FAQs

What does the assessment process for an electrician’s licence typically include?

Applicants are required to attend a written assessment test and an interview.

Is the list of technical questions in the document exhaustive?

No. The document states the list of technical questions is non-exhaustive.

What topics are covered under the general requirements questions?

The questions cover testing and safety procedures such as residual current circuit breaker checks, insulation resistance testing, earth resistance testing, continuity testing, polarity testing, and phase rotation testing.

Sep 30, 2026

Upload by Sarah