Earthing Systems

TN-C-S Danger – Broken PEN Conductor (Combined Earth and Neutral)

Combined Earth and Neutral

Description of the dangerous situation which can occur when the combined earth and neutral supply wire is broken on a TN-C-S electricity supply, leaving the line conductor connected.

Any RCD fitted in the installation will NOT disconnect in the event of this type of fault, and dangerous voltages will appear on exposed metalwork within the installation.

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