Скачать или смотреть Dangerous Changeover Switch Wiring – Undersized Flex Backfeeding Whole House

During this inspection, I uncovered a serious compliance problem with a changeover switch installation:

The main DB has a municipal supply feeding a changeover switch.

A single-phase supply was bridged into a 3-phase feed using undersized flexible cable (approx. 2.5 mm² cabtyre).

This cable is being used to supply the entire house when Eskom power is off.

The system backfeeds power into a socket outlet that ties into the changeover, delivering unstable voltages (measured at 118 V).

This setup is dangerous and non-compliant under SANS 10142-1. Undersized conductors risk overheating and fire. Bridging phases incorrectly creates shock hazards and could cause major damage to appliances.

⚠️ If your changeover switch looks anything like this, it will fail inspection and puts your home at risk.

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Compliance References (SANS 10142-1):

6.3.1.5: Conductors must be correctly identified and used for their intended purpose.

6.1.6.4: Each conductor shall terminate individually in a terminal designed for the purpose.

6.1.7.1: Conductors must be of adequate size to safely carry load current without overheating.

7.12.2.6: Changeover switches must be installed to ensure safety, isolation, and proper supply continuity.