Bathroom electrics

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There are extra considerations for electrical wiring in a bathroom.

Article currently incomplete.


Bathrooms are divided into zones for electrical purposes.

Zone 0

  • The interior of the bath or shower
  • Electrical appliances here must be IPX7
  • Electrical appliances here must run on SELV at a maximum of 12v ac or 30v dc

Zone 1

  • area directly above zone 0, upto a height of 2.25m above the bath or shower, or to the height of the maximum reach of the shower head if that is greater.
  • Electrical appliances must be SELV with the transformer outside all the zones
  • Electrical appliances must be IPX4 or better

Zone 2

  • area beyond zones 0&1, extends 60cm horizontally and upto 2.25m vertically beyond zones 0&1.
  • Also area within 60cm of sinks, plus area directly below this
  • Electrical appliances must be IPX4 or better
  • Electrical appliances here must run on SELV wth transformer outside the zones

Zone 3

  • zone 3 ceased to exist in 2008 with the 17th edition of the wiring regs.


  • Outside zone 2
  • Under the bath if a tool is required to gain access
  • Shaver units permitted
  • SELV appliances permitted
  • Non-selv portable appliances in bathrooms must be physically prevented from entering zone 2. This is usually done by limiting mains lead length on the appliance.

Unsuitable in all zones

  • Some appliances are marked unsuitable for bathrooms
  • Some appliances are not thus marked, but are still unsuitable. CRT TVs are one example.

Supplementary bonding

outdoor equipotential bonding clamp

Supplementary equipotential bonding is required for new electrical installations in bathrooms. There is no requirement to retrofit it to existing installs.

See Earthing_and_Bonding


Section to be written.

Installing mains electrics in showers is definitely frowned upon. But remarkably, it has been done!

See Also