I'm proposing to run a 230V electricity supply to my garage (30m from house) using underground SWA cable.
I need a ground rod to supply the garage with a safe earth. The salesman at Furse told me that the standard domestic rod is 3/8" diameter x 1.2m length.
A few electrical wholesalers I've phoned, however, stock 3/8" x 4ft as "standard". Is 4ft likely to be OK? The garage is above quite a high water table.
Can I drive the rod straight into the soil outside the garage and protect the top with a cover?
I'll measure the rod resistance on a dry day soon after installation.