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Hot Water unit New Installs will require- ” RCD’s & Isolation Switches” Not exsisting Unless….

New AS3000 Wiring Rules  – What’s new?

 

An explanation from the Electrical Safety Office – E-alert  Updated 05-06-2020

(New Hot water unit Installs- RCD protection on all Hot water units-)

This rule does not apply for existing installed Hot water units or direct like for like replacement Hot water.

There are two new requirements for Electric Hot Water units.

These rules only apply to NEW INSTALLATIONS ONLY not existing or like for like replacements.

The new AS3000:2018 Electrical wiring rules as published;

  • A new hot water installation will require an Isolation switch to be installed near the Hot Water unit.
  • All new installations or altered circuits /subcircuits with hot water units are required to have an RCD (Residual Current Device) 30 mA installed.

There is a concern with the new RCD (Residual Current Device) rule for Hot Water units, the householder could experience false tripping. False tripping can be prevented – if the electrician makes certain the Hot Water unit is installed on a dedicated circuit. If the unit is a standalone circuit/ RCD, there should not be any false tripping. IE: If there were 2-3 hot water units, each Hot Water should be powered by an individual and dedicated RCD and circuit.

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