Photovoltaic inverter installation to prevent electric shock

Can a PV installation cause a shock accident?

Anytime a PV installation consists of more than two PV modules, a shock accident should be presumed to exist. The best possible method to avoid electric shock is to measure-always measure- the voltage from any conductor to any other conductor, and to ground. Use a clamp-on ammeter to measure and record the current flowing in the conductors.

How do I prevent electric shocks in a PV array?

The electric shock voltage will increase with the number of series connected modules. The use of insulated tools and gloves, together with insulating matting to stand or sit on, can mitigate this hazard. An electric shock may also be experienced due to the PV array developing a ground leakage path.

Can a PV array cause an electric shock?

An electric shock may also be experienced due to the PV array developing a ground leakage path. Good wiring practice, double insulation and modules of Class II construction can significantly reduce this problem, but in any installed systems, leakage paths may still occur.

Are photovoltaic systems safe?

If properly installed and maintained by trained personnel as required by electrical codes, photovoltaic (PV) systems do not pose health, safety, or environmental risks under normal operating conditions.

How to restart a PV inverter?

The inverter should be manually restarted after the ground fault is corrected. The PV rapid shutdown system is a device or devices that control the voltage of various PV circuits when initiated by one or more initiation devices. Its purpose is to reduce shock hazards for firefighters. (Note: The passage does not directly answer when the inverter should be restarted in relation to the correction of the ground fault, but it is implied that it should be restarted after the correction.)

Can a PV module be switched off?

PV modules produce electricity when exposed to daylight and individual modules cannot be switched off. Hence, unlike most other electrical installation work, the electrical installation of a PV system typically involves working on a live system. See requirements of Regulation 14 of Electricity at Work Regulations 1989.