Page 243

Warwick Electrical Product Guide

Tcca Ia Single-Phase Installations Extensions or Alterations to Existing Three-Phase Installations The fixed installation colours of red phase and black neutral are replaced by brown phase and blue neutral, respectively. These are the colours that have been used in appliance flexible cables for many years. The protective conductor is still identified by the colour combination For alterations and extensions to three-phase installations, it is recommended that old and green-and-yellow. new cables are marked at the interface L1, L2, L3 for the phases and N for the neutral. The marking should be made to both the new and old cables and is preferred to the use of coloured tape. A caution notice is again required at the distribution board. Existing New (harmonised) Cannot be used after 31 March 2006 May be used after 31 March 2004 Twin flat 6242Y Triple flat New Circuit 6243Y Three-Phase Installations For three-phase cables the phase colours are brown, black and grey, instead of red, yellow and blue, respectively, and the neutral colour is now blue instead of black. Again the protective conductor is identified by the colour combination green-and-yellow. Alternatively all three of the phase conductor cores may be coloured brown and marked L1, L2, L3 at the terminations. Existing New (harmonised) Schematic of alternative interfaces Red Brown Yellow Black Blue Grey Black Blue Four-core armoured Red Brown Yellow Brown Blue Brown Black Blue CAUTION - This installation has wiring colours to two versions of BS 7671. Extensions or Alterations to Existing Great care should be taken before undertaking extension, alteration or repair that all Single-Phase Installations conductors are correctly identified. Alterations or additions to a single-phase installation do not require marking at the interface between old and new cabling providing that they are correctly coloured. However a warning notice must be fixed at the distribution board or consumer unit, like this: New Remember: Existing Existing You will need to use the new cables in order to comply with BS 7671 (the Wiring Regulations), from the dates shown. For more information, consult the industry’s agreed web resource centre: www.iee.org/cablecolours CAUTION - This installation has wiring colours to two versions of BS 7671. Great care should be taken before undertaking extension, alteration or repair that all conductors are correctly identified. No liability can be accepted for the data below which is given for guidance only.  !  !      # "    241


Warwick Electrical Product Guide
To see the actual publication please follow the link above