User`s manual

DS2100 User's Manual SECTION 2: SAFETY & EMC INSTRUCTIONS
PAGE 2-12 C27750-001
Wherever possible, insulated conductors and cables that have flame-retardant properties shall be used.
Where insulated conductors and cables can constitute a fire hazard due to the propagation of a fire or the emission of
toxic or corrosive fumes (e.g. PVC), guidance from the cable supplier should be sought. In particular it is important to
maintain the integrity of circuits having a safety function (e.g. emergency stop) for as long as possible under these
conditions.
The mechanical strength and thickness of the insulation shall be such that the insulation cannot be damaged in operation
or during laying, especially for cables pulled into ducts.
The voltage drops on cables and conductors shall not exceed 5% of the nominal voltage. The current carrying capacity
of the conductors and cables is determined by both:
• the maximum allowable conductor temperature under the highest possible steady state current under normal
conditions; and
• the ultimate allowable short-time conductor temperature under short circuit conditions.
b) Wiring Practices - Connections and routing
All connections, especially those of the protective bonding circuit, shall be secured against accidental loosening.
c) Wiring Practices - Conductor and cable runs
Conductors and cables shall be run from terminal to terminal without splices or intervening joints
Where it is necessary to connect and disconnect cables and cable assemblies, sufficient extra length shall be provided for
this purpose.
The terminations of multicore cables shall be adequately supported where undue strain can be exerted on the
terminations of the conductors.
Wherever possible, the protective conductor shall be placed close to the associated live conductors in order to decrease
the impedance of the loop.
d) Wiring Practices - Conductors of different circuits
Subject to the constraints for EMC suppression given in this User’s manual, conductors of different circuits may be laid
side by side. They may occupy the same duct (e.g. conduit, cable trunking system) and 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.