SECTION 2: SAFETY INSTRUCTIONS T200 User's Manual
PAGE 2-11
d) Wiring Practices - Conductors of different circuits
Subject to the constraints for EMC suppression given in Sections 2.3 and Section 3 of this User’s manual, conductors of
different circuits may be laid side by side, may occupy the same duct (e.g. conduit, cable trunking system), or may be in
the same multicore cable, provided that the arrangement does not impair the proper functioning of the respective
circuits. Where these circuits operate at different voltages, the conductors shall be either separated by suitable barriers or
insulated for the highest voltage to which any conductor within the same duct can be subjected.
Circuits which are not switched off by the supply disconnecting device (circuit breaker) shall be either physically
separated from other wiring or distinguished by colour (or both) so that they can be identified as being live when the
supply disconnecting device is in the OFF or OPEN position.
e) Wiring Practices - Identification of conductors
For safety reasons, the colour Green or the colour Yellow shall not be used where there is a possibility of confusion with
the bicolour combination GREEN-AND- YELLOW.
Colour identification using combinations of colours may be used provided there can be no confusion and that GREEN or
YELLOW is not used, except in the bicolour combination GREEN- AND-YELLOW.
f) Wiring Practices - Identification of the protective conductor
The protective conductor shall be readily distinguishable by shape, location, marking or colour. When identification is
by colour alone, the bicolour combination GREEN-AND-YELLOW shall be used throughout the length of the
conductor. This colour identification is strictly reserved for the protective conductor.
For insulated conductors, the bicolour combination GREEN-AND-YELLOW shall be such that on any 15mm length,
one of the colours covers at least 30% and not more than 70% of the surface of the conductor, the other colour covering
the remainder of the surface.
Where the protective conductor can be easily identified by its shape, position or construction (e.g. braided conductor), or
where the insulated conductor is not readily accessible, colour coding throughout its length is not necessary but the ends
or accessible positions shall be clearly identified by the graphical symbol or by the bicolour combination GREEN-
AND-YELLOW.
g) Wiring Practices - Identification of the neutral conductor
Where a circuit includes a neutral conductor identified by colour, the colour shall be LIGHT BLUE. LIGHT BLUE shall
not be used for identifying any other conductor where confusion is possible.
In the absence of a neutral conductor, a LIGHT BLUE conductor may be used for other purposes except for use as a
protective conductor.
Where identification by colour is used, bare conductors used as neutral conductors shall be either coloured by a LIGHT
BLUE stripe, 15 mm to 100 mm wide, in each compartment or unit or at each accessible position, or coloured LIGHT
BLUE throughout their length.
h) Wiring Practices - Wiring inside enclosures
Panel conductors shall be supported where necessary to keep them in place. Non-metallic channels or conduits shall be
permitted only when made with a flame-retardant insulating material. Where possible earthed shielded metal cable
ducting should be used to minimise EMC noise coupling.
It is recommended that electrical equipment mounted inside the enclosures be designed and constructed in such a way as
to permit modification of the wiring from the front of the enclosure. Where this is not possible and control devices are
connected from the rear of the enclosure, access doors or swing-out panels shall be provided.
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