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Special locations and bathroom zonesIs a kitchen sink a special location?

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BS 7671 Part 7 lists the special installations or locations. The first is locations containing a bath or shower. Any room with a bath or shower, en-suites included, is a special location. A sink on its own doesn't count.

BS 7671 · Contents · Part 7 special installations or locations (701 = bath/shower) · p.3

ZONE 0 (inside bath) ZONE 1 ZONE 2 ZONE 2 2.25 m 0.6 m outside the zones: not notifiable* The zones are the same above a shower tray. Without a tray, zone 1 extends 1.2 m from the fixed water outlet.
Anything installed in zones 0, 1 or 2, such as an extractor fan, light or electric shower, is notifiable. *Work outside the zones isn't notifiable, but the room is still covered by Part P. A pull-cord switch fixed to the ceiling outside the zones is fine.

Electrician's Guide to the Building Regs · Figure: extent of the special location in a bath or shower room (600 mm and 2.25 m) · next page after the notifiable table · p.30

Electrician's Guide to the Building Regs · Bathroom zone drawings: bath, shower tray, walk-in shower with no tray · pp.88–89 Electrician's Guide to the Building Regs · Swimming pool zones · p.93

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