Water supply from house to external building

[BEENIEMAN]

I need to supply water for toilet in portacabin.
1. How is this done?
2. What is depth for plastic pipe underground?
3. How should supply exit the main building - what is configuration?
4. Does the supply require NRV? Where should this be situated?
Any other useful tips please?
Thanks

 

[Madrab]

I need to supply water for toilet in portacabin.
1. How is this done? - A mains pipe is run to the portacabin
2. What is depth for plastic pipe underground? - regs state Min 750mm Max 1350mm
3. How should supply exit the main building - what is configuration? - Depends but you would look to have an Isolation and a double check valve from the mains supply
4. Does the supply require NRV? Where should this be situated? - After the stop tap feeding the distribution pipe