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A comprehensive guide for Installation Rules P1 and P2 calculations for all 2022 - 2024 papers.
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Apr 2025 P2 exam paper now referenced to the P2 study guide.
Apr 2025 past papers added.
Latest SANS 10142-1: 2024 Edition 3.2 added for reference.
Apr 2025 P1 exam paper now referenced to the P1 study guide.
This section on determining the size of the conductors appears in both Paper 1 and Paper 2 of the exam.
Memo is accurate
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Errors: 7.1.1: 5×14=70 not 85 7.2: Could be worded better for clarity
Error: 5.2 calculation wrong in memo
Compare: Slightly similar to Apr 2019 Q7
Rule: Earth conductor ≤50% smaller than Live wire Min: 2.5mm² smallest allowed
Method: Use Table 6.27 for cable size from 25A CB
Compare: Similar to Nov 2019 Errors: 9.2: should be (2×3×10), 9.3: answer=249
Aug 2018 Q3
Apr 2019 Q7
Nov 2019 Q5
Nov 2024 Q9
Memo is accurate, not too different from posted videos
Memo is unavailable, but this question is not too different from posted videos
Memo is accurate. Note: Spare capacity for the lights is multiplied by 2 to bring it back to the connected load value before it is multiplied by the diversity factor to bring it to the estimated load value.
Memo is accurate. Note: Spare capacity for the lights is multiplied by 2 (or by 0.5 in this case) to bring it back to the connected load value before it is multiplied by the diversity factor to bring it to the estimated load value.
3.1: Typing error: 3900 W → 2900 W 3.2: Typing error: 3150 → 2900 Calc: IB=2900/230=12.61A, IH=2500/230=10.87A, Ratio=1.16
Key: AC diversity factor = 1 (not in SANS list) Error: 23 V × 60 A → 230 V × 60 A
Memo: Accurate application of estimated load Rule: Lights = 60W unless specified otherwise
The memo is unavailable, but it looks fairly easy to solve.
Issue: "Connected load" vs "Estimated load" confusion Ref: Apr 2025 Q8 video
Note: Correct application of the Estimated Load calculation with diversity factors. See video
Note: This is the correct application of the Estimated Load calculation with diversity factors. See video
Repost clearer video... Note: Correct application of the Estimated Load calculation with diversity factors. See video
Compare: Nov 2019 (correct) vs this QP (incorrect) Issue: "Connected load" but still uses DFs Ref: Apr 2025 Q8 video
Issues: Wrong DF for oil heater + "Connected" vs "Estimated" Ref: Apr 2025 Q8 video
Issues: "Connected" vs "Estimated" + CB too high + Geyser error (4kW vs 2kW) Key: 1 HP = 750W, discuss 60W changes
Nov 2016 Q3
Apr 2017 Q3
Aug 2018 Q2
Nov 2019 Q4
Nov 2024 Q8
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