172-173 / 319
Designers and installers must select a wiring system that avoids
damage to the sheath and insulation of cable during installation,
use and maintenance.
Where cables enter a distribution board from trunking, the cables
must be protected from any sharp edges in order to comply with
522.8.1. Common methods of complying include deburring
edges and using grommet strips or manufactured spacers.
Regulation 526.9 requires that the cores of unsheathed cables
from which the sheath has been removed and non-sheathed
cables at the termination of the trunking etc are enclosed.
Complying with these regulations can be difficult when passing
the cables from the trunking into a distribution board.
The on-site construction of a spacer using material such as
paxolin is a common solution. This is, however, time consuming
and produces dust, so appropriate health and safety protection
may need providing. Also the installer must take care that the
solution fully complies with the regulations by making a proper
seal.
Cable entry