Installation Rules Exam Paper 2 Mistakes That Cause Failures (And How To Avoid Them)

Introduction

Installation Rules Paper 2 is the toughest component of the SANS 10142 exam. It focuses heavily on calculations and the practical application of electrical installation rules. Many candidates repeat Paper 2 several times simply because they do not prepare correctly. The syllabus confirms that Paper 2 calculations covers:

• Voltage Drop calculations
• AC/DC Prospective Short-Circuit Current (PSCC)
• Touch Voltage
• First principles (resistivity, power, current relationships)
• Verification & Certification requirements

1. Not practicing calculations daily

Paper 2 is calculation‑heavy. Consistent repetition builds speed. The simulator helps by generating timed sets of 10 exam-style questions.

2. Weak understanding of PSCC (AC & DC)

Many learners only practice AC PSCC, forgetting DC PSCC also appears.

3. Confusing Touch Voltage concepts

Touch voltage requires understanding earth-fault impedance and protective device timing.

4. Not revising first principles

Basic relationships—resistivity, conductor size, power formulas—underpin most Paper 2 calculations. If you are struggling with calculations, read our guide on Installation Rules Paper 2 Calculations .

5. Not using past papers + memos

Past papers teach question style and marking expectations.

6. Ignoring verification & certification content

Verification, inspection, test instruments, and CoC compliance form a substantial part of Paper 2.

7. Not understanding special installations

• Medical locations
• Safety services
• Bathrooms
• Earthing arrangements (TN / TT / IT)

8. Last‑minute studying

Paper 2 requires at least 4–8 weeks of structured preparation before the exam windows in Mar/Apr, Jul/Aug, and Nov.

9. Not timing themselves

Most candidates fail due to speed, not because they do not know the rules. Timed exam simulator sessions fix this.

10. No revision strategy

A final week of daily simulator drills + past paper rewrites dramatically improves outcomes.

Frequently Asked Questions

Why do most candidates fail Paper 2?

Most candidates fail because they lack calculation practice and struggle with PSCC, voltage drop and touch voltage questions.

How can I pass Installation Rules Paper 2?

The best approach is daily calculation practice, working through past exam papers and simulating real exam conditions.

What calculations appear in Paper 2?

Common calculations include voltage drop, prospective short circuit current, touch voltage and conductor sizing.

Start Your Installation Rules Exam Preparation Today

Passing the Installation Rules exam requires more than reading SANS 10142—it takes structured practice. Our Installation Rules Study Guide includes realistic exam‑style questions, concise explanations, and high‑weight syllabus coverage.

Start Your Installation Rules Exam Preparation Today

What You Will Learn

• Interpret and apply the OHS Act and Electrical Installation Regulations
• Calculate voltage drop, PSCC (AC & DC), touch voltage
• Perform inspection, testing, verification, and complete CoC tasks
• Master SANS 10142‑1 installation requirements
• Work effectively under exam time pressure