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SAFETY SWITCHES (RCD'S)

Safety switches (RCDs) need to be tested in accordance with AS/NZS 3760:2003. RCD testing helps to ensure that the equipment operates correctly when a suitable fault condition occurs.

An RCD (Residual Circuit Device, also known as a safety switch) is an electrical safety switch that almost instantaneously switches off the electricity if there a electrical current imbalance or a current short circuit to earth, such as when someone touches a live wire by mistake.

 

An RCD switch is a device located in the electrical switchboards of all commercial premises.

As per electrical appliance tagging requirements, all RCDs are to be inspected and tested in accordance with AS/NZS 3760:2003. This is to ensure that the equipment operates correctly when a suitable fault condition occurs.

The RCD should be tested for tripping times which is in milliseconds, plus a manual test performed by a push button test.

The information from these tests is recorded and any abnormal readings, if any, are reported to you along with suitable solutions.

These devices which include MCBRCDs are designed to save lives and are installed with considerable cost. It therefore makes sense to ensure that they function correctly.

Testing is performed on a yearly basis and requires the shutdown of circuits for approximately 20 minutes.

Yearly test procedure:

1. Visual RCD identification

2. Manually trip RCD

3. Reset RCD circuit breaker

4. Plug in RCD test device and test tripping time and trip current

5. Reinstate supply

6. Record all test results

All works must be carried out by a suitably qualified person.

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