Exam (elaborations)

Inspection and Testing – 2391 Written Exam Practice Questions and Answers (Mock Test 1) – Electrical Installation Testing Revision Guide

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This document provides practice questions and accurate answers for the 2391 Inspection and Testing written exam. It covers essential electrical testing principles including insulation resistance testing, continuity testing, earth fault loop impedance, polarity checks, RCD testing, and safe isolation procedures. Designed as a revision aid for electrical installation candidates, the material focuses on key theory concepts, testing procedures, and interpretation of results in line with BS 7671 requirements. It helps learners strengthen understanding of inspection and testing processes and prepare effectively for written and practical assessment components.

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3/25/26, 2:41 PM

Science Engineering Electrical Engineering

INSPECTION AND TESTING - 2391 WRITTEN EXAM
1
PRACTICE

Explain how the value of prospective fault current (Ipf) is Model Answer:
determined following Prospective Earth Fault Current (PEFC)
and Prospective Short Circuit Current (PSCC) tests The highest value of Prospective Short Circuit Current (PSCC) between
Line 1 -
Neutral Line
2 - Neutral
Line 3 -
Neutral

is doubled and recorded on as the Ipf value.

Explain the main reason for disconnecting one end of a main Reference: GN3: Section 2.5.3 (Test bonding conductors and earthing conductors)
protective bonding conductor when carrying out continuity.

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, 3/25/26, 2:41 PM

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Course: INSPECTION AND TESTING

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Uploaded on: May 11, 2026
Number of pages: 6
Written in: 2025/2026
Type: Exam (elaborations)
Contains: Questions & answers

Subjects

electrical testing
bs 7671
electrical installation
earth fault loop impedance

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Inspection and Testing – 2391 Written Exam Practice Questions and Answers (Mock Test 1) – Electrical Installation Testing Revision Guide

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