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Reading through the standard again, it seems I missed something further in the back of the document.
Under Section 7.5.11.3, There are no depth-of-burial requirements for the safety of extra-low voltage cables. NOTE: Consideration should be given to the risk of mechanical damage.
However, throughout Section 7.5, there are various other protection requirements and notes such as;
- A Safety Isolating Transformer complying with AS/NZS 61558
- Basic protection is not necessary for voltages not exceeding 25 V a.c. or 60 V ripple-free d.c., in dry indoor conditions. Obviously this is outside now, to basic protection would be required, such as barriers or enclosures with a degree of protection of at least IPXXB or IP2X.
- Live parts shall be arranged so that short-circuit or arcing, either between live parts or between live parts and other conductive material, will not take place under the conditions that may reasonably be expected in service.
- Every extra-low voltage circuit shall be individually protected at its origin
against overload and short-circuit currents by a protective device.
I could probably go on here, but I reckon somewhere out there, a Google Search will yield the whole document.
As always, you should consult a registered cabler or electrician to ensure that it complies with the Wiring Rules.
Joel
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