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Appliances Can Kill... Safety First!
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Electrical Terminology
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Number Prefixes
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Ohms Law
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An overview of our safe working practices
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What is Earth Loop Testing
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TN-S Earth System
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TN-C-S System
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TT System
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Testing a TN-S Earth System
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Testing a TN-C-S System
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Testing a TT System
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How to perform an earth loop test from a hard wired appliance
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What is Earth Continuity
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Earth Continuity Test Sequence
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What is Insulation Resistance?
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Insulation Resistance Test Sequence
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How to test Earth Continuity and Insulation resistance on a freestanding appliance.
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How to test Earth Continuity and Insulation resistance on a hard wired appliance.
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Safe Isolation
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Water Regulations
Quizzes
A TN-C-S system, shown in the image below, has the supply neutral conductor of a distribution main connected with earth at source and at intervals along its run. This is usually referred to as protective multiple earthing (PME). With this arrangement, the distributor’s neutral conductor is also used to return earth fault currents arising in the consumer’s installation safely to the source. To achieve this, the distributor will provide a consumer earthing terminal that is linked to the incoming neutral conductor.
