Guide to Junction Boxes

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This section aims to explain some of the regulations
contained within the 17th Edition Wiring Regulations,
regarding the connection of conductors both for lighting and
power final circuits.
Electrical Connections
The requirements of the 17th Edition Wiring Regulations
concerning electrical connections are covered mostly within
section 526. This section states that every electrical
connection shall have durable electrical continuity, adequate
mechanical strength and protection.
The wiring method illustrated here is a common cause of
non-compliance particularly with lighting circuits and the
connections to downlighters in particular.
• It can be seen that the sheath of the flex is not enclosed.
This is due to the junction box connection method not
facilitating an easy means of enclosing the outer sheath, a
non-compliance with regulation 526.8.
• Another problem is that during installation and
maintenance, mechanical strain may be placed on the
terminations of the conductors within the junction box. This
is due to the lack of a clamping method for the cable, a
non-compliance with the regulation 522.8.5.
“Connections to downlighters
are a common cause of
non-compliance”.
Guide to | Junction Boxes 5