Australia and New Zealand
ELV is defined in AS/NZS 3000 Wiring Rules as "Not exceeding 50 V a.c or 120 V ripple-free d.c."
In most Australian states (but not all) there are no formal constraints as to who can work on ELV systems. AS 4509.1 Stand-alone Power Systems: Safety requires that work be performed by a "competent person" that is "a person who has acquired through training, qualifications, experience, or a combination of these, knowledge and skill enabling that person to correctly perform the task required".
ELV wiring in domestic premises must be installed at a minimum distance of 50 mm from low voltage wiring or have a separate insulating barrier such a conduit. ELV cable and wire types include PVC insulated building wire, double insulated Thermo-Plastic Sheath (TPS), and fine stranded multi-strand cable (like automotive cable, although this may only be rated to 32 V DC, and not the full ELV range).
State regulations override the Australian Standards, and there are some differences.
Read more about this topic: Extra-low Voltage, Regulations
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