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PAT earth continuity, worked out properly0.08 ohms on a hot plate. Pass?

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The question at the end: 0.08 ohms on a hot plate. Pass? The answer is in the notes below.

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Hot plate. Null the leads. Clamp one tight on the plug’s earth pin and put the other on the metalwork itself — an exposed-conductive-part, not the earth terminal screw. The book is specific: on the screw, you’ve only proved the connection to the screw. Flex the cable while you watch; a reading that jumps or climbs is a poor connection. Say it reads 0.08 Ω.

The limit

Maximum = 0.1 Ω + R of the flex
R = (mΩ/m × length) ÷ 1000
  = (26 × 1) ÷ 1000 = 0.026 Ω   (0.75 mm², 1 m)
Maximum = 0.1 + 0.026 = 0.126 Ω
Measured 0.08 Ω  ≥ 0.026, ≤ 0.126   ✓
0 0.026 flex alone 0.08 0.126 max below the flex’s own resistance? the measurement is wrong, not the appliance
Between the flex’s own resistance and the limit. Scale: 0 to 0.126 Ω.
Painted or powder-coated parts can read high. Repeat the test to get a better contact rather than scratching through the finish. And only exposed-conductive-parts need testing — where there are several, test each.
Older equipment may read a little above the limit. Up to 0.5 Ω in total, equipment plus supply cable, is acceptable if you’re satisfied it’s the design and not a deteriorating earth (Table 10.1). It’s 0.5 Ω including the cable, not plus it.

Code of Practice · 10.5.2 · Table 10.1

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