Guide to Junction Boxes

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Screwless terminals do not in themselves meet the
requirements of regulation 526.3. Conformity is indicated by
marking the symbol and BS 5733 on the maintenance
free accessory.
BS 5733 prescribes additional requirements and tests for
terminals for use within maintenance free accessories, to
verify that:
• Terminals have long-term connection capability
• Terminals are resistant to the effects of vibration
• Terminals withstand the effects of overloads and shall not
cause ignition or damage to the mounting surface
• Terminals are sufficiently resilient to the effects of thermal
shock
Hager maintenance free terminals have the additional
advantages of allowing the direct insertion of solid,
stranded or flexible conductors, and allowing
the connection of up to four conductors from
0.5mm2 to 4.0mm2.
Another regulation relating to junction boxes is 521.8.3 which
requires that where two or more circuits are terminated in a
single junction box this shall comply with BS EN 60670-22.
An accessory meeting the requirements of both standards
could therefore be dual marked BS 5733 and
BS EN 60670-22.
“Maintenance free terminals
provide a solution where
accessibility is an issue”.
Guide to | Junction Boxes 10