Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

Zone 2 is limited by:
(a) the vertical plane external to Zone 1 and a parallel plane 1.5 m from
the former,
(b) the floor or surface expected to be occupied by persons, and
(c) the horizontal plane 2.5 m above the floor or surface expected to be
occupied by persons.
There is no Zone 2 for fountains.
(3) Bonding
All extraneous conductive parts in Zones 0, 1 and 2 should be connected
by supplementary equipotential bonding conductors to the protective
conductors of exposed conductive parts of equipment situated in these
Zones.
(4) Application of protective measures against electric shock
(a) Except for fountains as stated in Code 26M(6), in Zone 0 only
protection by SELV at a nominal voltage not exceeding 12V a.c.
r.m.s. or 30V ripple-free d.c. is permitted, the source for SELV being
installed outside Zones 0, 1 and 2.
(b) Except for fountains as stated in Code 26M(6), in Zone 1 only
protection by SELV at a nominal voltage not exceeding 25V a.c.
r.m.s. or 60V ripple-free d.c. is permitted, the source for SELV being
installed outside Zones 0, 1 and 2.
(c) Equipment for use in the interior of basins which is only intended to
be in operation when people are not inside Zone 0 should be
supplied by a circuit protected by:
• SELV, the source for SELV being installed outside Zones 0, 1 and
2. However, it is permitted to install the source for SELV in
Zone 2 if its supply circuit is protected by an RCD having the
characteristics specified in Code 11J, or
• automatic disconnection of supply, using an RCD having the
characteristics specified in Code 11J, or
• electrical separation, the source for electrical separation supplying
only one item of current using equipment and being installed
outside Zones 0, 1 and 2. However, it is permitted to install the
source in Zone 2 if its supply circuit is protected by an RCD having
the characteristics specified in Code 11J.
(d ) In Zone 2, one or more of the following protective measures should
be employed:
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