Can I also point people at the BAJR H&S Advice document
"Think about what type of soil you are working in, a sand section is a lot
than clay sided one , a rubble section has the added danger of falling
access the safety of your trench before going in - it is your life. I know
personally of a
digger who died in a trench only 1m deep.. So be smart! You may need shoring
only 80cm - there is no specified depth now. The situation of a trench may
depending on weather, size of spoilheap, heavy machinery passing by."
There is No specific safe depth .. it all depends
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