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Category  |   Discussion (0)Extra-low voltage

Main > Building & fixing > Electrical > Extra-low voltage
Within Australia and New Zealand, extra-low voltage is <120V dc ripple-free and <50V ac. Anyone who knows how can install and/or work on extra-low voltage wiring. Anything above that voltage requires an electrician's license.   kellyjones00 (593)

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Main > Building & fixing > Electrical > Extra-low voltage
Safety precautions:
1. Working with solar panel arrays:
- First cover modules with tied-on blankets, to prevent an electrical current from being produced. A nominally 72V dc system can produce a potentially lethal 120 volts.
- Keep your non-dominant hand behind your back or in your pocket at all times. An electric current travelling from one hand to the other will go via the heart.
2. Working with inverters:
- Off-grid inverter output is as lethal as grid-connected inverter output, even when no load is connected, and even when it shows sleep mode.
- Disconnect both positive and negative terminals on the battery bank.
- Open the double pole main switch to break the leads, and secure it open. Remove the inbuilt fusible link and keep in your pocket until work is completed.
3. Working with batteries:
- Be very careful not to accidentally bridge the terminals on a battery, by, for instance, dropping a spanner onto them.
- For instance, a charged 48v 1000Ah battery bank can produce short-term currents of multiple tens of thousands of amps, and may exceed 1 million watts.
- Always insulate the rest of the spanner used to fit interconnecting cables or tighten terminals.
- Always wear goggles and overalls when working on batteries, sealed or not.
- Never bring any source of sparks near a battery.
- Never, ever smoke near a battery.
- Ensure cross-ventilation of air where batteries are stored.
- If electrolyte accidentally comes into contact with eyes or skin, bathe the affected area liberally in clean water and seek medical help.
- Do not store batteries directly on a floor, but raise above to avoid corrosion.   kellyjones00 (593)

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