Apprentice electrician is confused about the correct resistance calculation for PAT testing extension leads because the IET guideline adds 0.1 ohms but his logical reasoning suggests only the cable resistance matters.

Existing guidelines are unclear about why 0.1 ohms is added for extension leads with no equipment, causing confusion for trainees.

Severity

2Mild

Willingness to Pay

none

Added

May 14, 2026

App Concept

PAT Calc Pro

A mobile app that provides step-by-step guidance for PAT testing calculations, including context-specific explanations and automatic resistance limit calculation based on cable type and length. It clarifies confusing rules like the 0.1 + R formula with visual examples.

Key Features

Cable resistance calculator with automatic limit calculation
Context-based explanations for each test type
Interactive examples and quizzes for trainees
Reference library of IET guidelines with plain-language summaries

Target Users: Apprentice and junior electricians in the UK who perform PAT testing and need help understanding compliance calculations

Revenue Model: Free version with limited features; $4.99/mo subscription for full guidelines library and advanced calculator

Existing Solutions Mentioned

IET guidelinesPAT course

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