Supplementary bonding

Additional local bonding between simultaneously accessible conductive parts, classically in bathrooms. It is used where disconnection times or other conditions for protection can't otherwise be met. In modern installations it can often be omitted when the circuits are -protected and the main bonding is in place, which is itself a favourite exam point.

Where to look it up: BS 7671 Section 701.

Taught and practised in the Installation section.