Clear Thinking with Kewtech
RCD testing
6516 RCD Testing Clear Thinking with Kewtech
RCDs can be used as part of an installation design to enable the requirements of fault protection or additional protection to be met.
- Earth fault loop impedance test should be done and verified as acceptable before RCDs are tested.
- The test button on the RCD should pressed to ensure the RCD is working before testing.
- BS 7671 is a minimum standard and only mandates that all RCDs are tested under an AC test current.
- If the RCD tester being used has settings for additional types of RCDs it is advisable to carry the optional tests below.
- RCDs should be tested on both the positive (0°) and negative (180°) half cycles of the AC supply with the highest tripping time recorded.
Required tests.
| Max. tripping time | ||||
| RCD type | Instrument setting | Applied current | Non-delay | S type or time-delay |
| All | Type AC | AC 1 x I ∇n | 300 ms | 500 ms |
Optional tests.
| RCD type | Instrument setting | Applied current | Max. trippin6 time | |
| Non-delay | S type or time-delay | |||
| All | Type AC | IA x I An | No trip | No trip |
| All RCDs with I An 5 30 mA |
Type AC | 5 x I An or 250 mA (if declared by RCD manu.) |
40 ms | 150 ms |
| All RCDs with I An > 30 mA |
Type AC | 5 x I An | 40 ms | 150 ms |
| Type A, F or B | Type A (after type AC tests) |
1/2 x I An 1 x I An 5 x I An |
No trip 300 ms 40 ms |
No trip 500 ms 150 ms |
| Type B | Type B (after type AC & A tests ) |
2 x I An | 300 ms | 500 ms |
NB: These values comply to RCDs designed to the Harmonised Standards: BS EN 61008, BS EN 61009, BS EN 60947-2 and using test equipment designed to BS EN 61557.
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Kewtech ‘Clear Thinking’ diagrams are schematics to aid the understanding of electrical testing. Ensure proper safety procedures are taken before any testing.
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Documents / Resources
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KEWTECH 6516 RCD Testing Clear Thinking with Kewtech [pdf] Instruction Manual 6516 RCD Testing Clear Thinking with Kewtech, 6516, RCD Testing Clear Thinking with Kewtech, Testing Clear Thinking with Kewtech, Thinking with Kewtech |