Conductors:

The means of identification of each conductor, including protective conductors, should be verified. The deterioration of, or damage to, conductors and their insulation, and their protective coverings, if any, should be noted.

Marking and Labelling:

The labelling of each circuit should be verified. Notices or labels are required at the following points and equipment within an installation:

• at the origin of every installation
• where different voltages are present
• earthing and bonding connections
• Residual Current Devices (r.c.d.'s) Continuity of Protective Conductors and Earthed Equipotential Bonding :

  If any electrical installation can be isolated from the supply it is permissible to disconnect the protective and equipotential conductors from the main earthing terminal in order to verify their continuity. The sequence of operation needed for initial testing can be carried out safely on an existing installation if it is isolated from the supply. Where an electrical installation cannot be isolated from the supply the protective equipotential conductors must NOT be disconnected as, under fault conditions, the exposed and 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 fault loop impedance tests. The former to establish continuity of conductors and the latter to establish and confirm an appropriate disconnection time in the event of an earth fault.

  Polarity:

  Test shall be made to verify that:-

  • the polarity is correct at the meter and consumer unit/distribution board
  • single-pole control and protective devices are connected in the phase conductor only
  • conductors are correctly connected to socket-outlets and other accessories/equipment
  • centre-contact bayonet and Edison-type screw lamp-holders have their outer or screwed contacts connected to the earthed neutral conductor
  • all multi-pole devices are correctly installed
  For more information please contact Graham Moreton on 01483 270400.

  For this information in PDF Format click (File Size 71KB)

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