It can make and break current and be used for on-load isolation. To disconnect a DC supply safely, the switching operation must be performed quickly and the switch must be designed to dissipate the arc energy released during the switching operation.įor this reason, a switch-disconnector should be used because it is designed to function as a safety isolation switch. There will be arcing between the contacts that will stop only when the gap between the contacts is large enough to prevent breakdown of the intervening air. Switching a loaded DC circuit – such as that in the solar installation – is more difficult because you are always switching against the load, regardless of the supply from the PV array. It is relatively easy to switch an AC load because the load supply will always pass through zero twice in every cycle and any arcing between contacts when the switch is operated will be extinguished. The DC isolator is critical to the safety of the installation because switching a DC load safely can be tricky. After conversion to AC, the electricity passes through an AC isolator and into the domestic distribution unit and meter. The increasing popularity of solar power in the UK is helping householders cut their electricity bills – but the solar installation could also pose a danger if the components do not meet the latest standards.Ī typical installation consists of a photovoltaic (PV) array connected to a DC/AC inverter through a DC isolator.
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