Here's what we do to meet the Shedule of Inspection

• Visual Inspection
• Continuity
• Polarity
• Earth Loop Impedance
• Insulation Resistance
• Operation of Devices for I and S
• Residual Current Devices

Continuity of Protective Conductors and earthed Equipotential bonding.

If any electrical installation can be isolated from the electrical supply it is permissible to disconnect the protective and equipotential conductors from the main earthing terminal in order to verify their continuity. The testing sequence required for periodic fixed wire testing can only be carried out if it is isolated from the supply.

Where any part of the electrical distribution system cannot be isolated from the supply, the protective equipotential conductors MUST NOT be disconnected as, under fault conditions, the expose extraneous-conductive-parts could be raised to a dangerous level above earth potential.

The combined integrity of the conductors shall be established by continuity/earth loop impedance tests. The former is to establish continuity of conductors and the latter to establish and confirm an appropriated disconnection time in the event of an earth fault.