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9. Megging
Megging of an installation incorporating a GRUND-
FOS MAGNA pump is not allowed, as the built-in
electronics may be damaged. If megging of the pump
is necessary, the pump should be electrically sepa-
rated from the installation.
Procedure:
Before removing the cables, the electricity
must be switched off.
Megging of the pump
Step Illustration Action
1
TM03 0908 0705
• Switch off the electricity supply.
• Open the connection box.
2
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• Remove the supply wires L and N and the earth
wire (PE).
3
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• Short-circuit the wires L and N using a wire.
• Test between the wires L/N and earth (PE).
Test voltage: Max. 1500 VAC/DC.
Maximum permissible leakage current < 20 mA.
Note: Never test between the supply wires
(L and N).
4
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Test the cable to the pump.
• Pull the plug out of the pump and test again.
• Refit the supply wires L and N and the earth wire
(PE).
• Switch on the electricity supply.
PE
L/N
PEPE
L/N
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