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A better alternative
Another answer is to use a distribution board that has an end
plate adapted for coupling to trunking. In Hager’s new boards,
for example, the end plate has a removable section that leaves
a smooth edge return that is free from screw heads and nuts.
This allows flush coupling to trunking and a smooth entry for
cables to meet the requirements of 522.8.1 and 526.9 of the
Wiring Regulations.
Not only does this cable entry system meet the requirements of
the regulations, but it also cuts the time taken to fit the board to
trunking by up to four times.
In an independent trial, the time taken to fit a typical distribution
board to trunking when the installer needs to cut out the gland
plate and cut paxolin to shape was 50 minutes. When there
is no need to prepare gland plates, use paxolin or adjust the
trunking, the same installer took just 13 minutes to fit the
comparable Hager board.
Not only does this cable entry system
meet the requirements of the regulations,
but it also cuts the time taken to fit the
board to trunking by up to four times.”
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