Shower Installations & Power Rating Factor

The electrical connections to an electric shower are covered by many regulations. An electric shower must be installed on its own circuit and not spurred from any other connections or appliance.  First you must check that your fuseboard is capable of providing the current necessary and must be rated above 60 amps. An RCD (residual current device) must be installed as, either part of your existing fuseboard, or separately, interrupting the circuit to the shower. Connection to the fuseboard should be by means of a MCB (miniature circuit breaker). Fuse, switch and cable ratings are also vital and we would suggest that 10mm cable is used for all installations. This makes upgrading your shower much easier in the future.

Electric Shower Power Ratings and Power Cable Information:

  • Showers up to 7kw may carry a 6mm cable as long as the shower unit is within 18 metres of the fuseboard. Fuses and switches should be rated at 32 amps.
  • Showers up to 9kw may carry a 6mm cable as long as the shower unit is within 18 meters of the fuseboard. Fuses and switches should be rated at 40 amps.
  • Showers up to 9.5kw should carry a 10mm cable to units within 35 metres of the fuseboard. Fuses and switches should be rated at 45amp
  • Showers up to 12.5kw should carry a 10mm cable to units within 35 metres of the fuseboard. Fuses and switches should be rated at 50 amps.

Must be a double pole pull cord switch installed.

 

Electric shower circuit protection rating

 
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