All wiring used must be suitably rated for the current intended. In addition, the voltage rating of insulated wiring must be adequate for the voltages carried.
Internal wiring, providing primary power, must be protected against short circuit and overload.
Internal protective earth wiring can be uninsulated or
insulated. Insulation, if used, must be green/yellow, except for insulated earthing braids, where the insulation can also be transparent. Any color insulation may be used in ribbon
cable as long as this does not misrepresent the use of the conductor.
You must route wiring in such a way as not to cause excessive strain on wiring and terminals. Care must also
be taken that insulation cannot be damaged by strain contact with sharp edges.
DESIGN TIPS
In general, it is not recommended to have wiring from separate circuits (e.g. primary and secondary) in contact with one another, for example in a harness. If, however, you
do have such a situation, all the wiring in the harness must be rated for the highest voltage for any of the conductors in the harness.
All wiring must be tied up so that if a wire breaks lose from
a connector, it cannot touch another circuit. All crimped connections must be double crimped, once of the conductor and once on the insulation.
Make sure the wiring has the approvals you need for your
target markets (see
