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Gas pipe depth - plumbing standards

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Hi,
Just wondering what the standard was for depth gas pipes are laid.
Any difference in requirement of depth from
gas meter to footpath or depth of pipes from gas meter to home.
I'm landscaping at present and based on hand excavation they seem to be on average about 300mm deep. I thought gas was meant to be 600mm,
But maybe that is in the U.K.
much appreciated
It comes under AS/NZS 5601. For residential it is:

Metallic Pipe 300mm
Non Metallic or composite 450mm

They can also be above ground a minimum of 50mm above ground level.
Thank you SaveH20
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