User`s manual

SECTION 2: SAFETY & EMC INSTRUCTIONS DS2100 User's Manual
C27750-001 PAGE 2-13
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. However,
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.
Connections to devices mounted on doors or to other movable parts shall be made using flexible conductors in
accordance with European standard EN 60204-1, to allow for the frequent movement of the part. The conductors shall
be anchored to the fixed part and the movable part independently of the electrical connections.
Conductors and cables that do not run in ducts shall be adequately supported.
Terminal blocks or attachment plug/socket combinations shall be used for control wiring that extends beyond the
enclosure.
Power cables and cables of measuring circuits may be directly connected to the terminals of the devices for which the
connections were intended.
i) Wiring Practices - Wiring outside enclosures
The means of introduction of cables or ducts with their individual glands, bushings, etc., into an enclosure shall ensure
that the degree of protection is not reduced.
Conductors and their connections external to the electrical equipment IP54 enclosures shall be installed in suitable ducts
(i.e. conduit or cable trunking systems) as described in Section 2.2.4, except for suitably protected cables, which may be
installed without enclosing ducts and with or without the use of open cable trays or cable support means.
Fittings used with ducts or multi-conductor cable shall be suitable for the physical environment.