Require depth of 24V cable

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Paul1977

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#290184 26-Oct-2021 11:30

We're looking to put in some irrigation, and the design means we'll need to run a decent length of some 24v cable to power some solenoids.

My google-fu is failing me, as I can't find if there's a minimum depth this needs to be buried (inside conduit). I can find the rules for 240V TPS, but am drawing a blank for 24V.

Thanks

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michaelmurfy

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#2801250 26-Oct-2021 11:33

Like garden lights I don't think there is a specific requirement for low voltage cabling. For example, there is no requirements to even bury the garden light cable (which runs at 24v in my case).

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Paul1977

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#2801273 26-Oct-2021 11:58

michaelmurfy:

Like garden lights I don't think there is a specific requirement for low voltage cabling. For example, there is no requirements to even bury the garden light cable (which runs at 24v in my case).

Thanks, that makes things easier.

cisconz

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#2801321 26-Oct-2021 12:53

I would highly recommend conduit though (Even if not buried), it protects against the spade and will last a lot longer.

Hmmmm

coffeebaron

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#2801375 26-Oct-2021 13:53

Typically you'd aim for 200mm like short depth fibre, but no official requirement to do so.

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SomeoneSomewhere

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#2801394 26-Oct-2021 14:38

I think it's in section 7 of 3000, but by memory it is 'there is no depth or requirement for protection'.

This assumes it is SELV or PELV; i.e. fully isolated from the mains.

raytaylor

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#2804321 30-Oct-2021 15:10

I say to customers
"Deeper than a cows hoof if the paddock becomes very muddy"
Or 300mm, whichever is deeper.

Always do conduit. We like using the 16mm irrigation hose from mitre 10 - its super cheap and works as a layer of protection against rodents.

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Froglotion

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#2804548 31-Oct-2021 09:14

Could just run battery setup? Mine runs off a 9V battery for the controller which controls two solenoids.

Bung

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#2804561 31-Oct-2021 09:39

raytaylor:
I say to customers
"Deeper than a cows hoof if the paddock becomes very muddy"
Or 300mm, whichever is deeper.

The length of the blade on a garden spade should be minimum for anything. I was digging in an area full of macrocarpa roots and didn't realise that the water supply originally looped around the back of the house to a tank. I hit resistance and hit it back harder. The pvc water supply pipe was about 150mm from surface. At least with water you get immediate feedback.