Sunk an Earthing Rod?

[Mark]

Anybody sunk an earthing rod? I am trying to establish a good earth
for my old farm house in Spain. Unfortunatly the soil is only 12" deep
before I hit solid rock. I have a 24" long drill so I drilled two 10mm
holes about a foot apart into the rock, cut my 4 foot, 10mm copper
earthing rod in half, sunk the two halfs into the two holes, clamped
on my earth wire to each, and covered over with watery cement. The
question is, is this a good enough earth. I tried running a 40W light
bulb between my earth and live, and although the bulb lights, it is
getting 30 volts less than if I wired the bulb across the live and
neutral, ie 190V instead of 220V. Anybody give me some help please.

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[Malcolm Stewart]

Anybody sunk an earthing rod? I am trying to establish a good earth
for my old farm house in Spain. Unfortunatly the soil is only 12" deep
before I hit solid rock. I have a 24" long drill so I drilled two 10mm
holes about a foot apart into the rock, cut my 4 foot, 10mm copper
earthing rod in half, sunk the two halfs into the two holes, clamped
on my earth wire to each, and covered over with watery cement. The

snip

Have you sought local advice?
I remember when we were delivering electrical equipment to southern Italy, and
our printed requirements for a "good local earth" etc. were met with some
incredulity - for reasons similar to your situation.
Equipment has now been installed and working for several years with no problems
(AFAIK).