"Andy Wade" wrote in message
...
Sparks wrote:

Okay, the origanal question was why shouldt I connect the house earth to
the garage TT earthing arangement - why must they be kept seperate?
(The cable run up to the garage is about 50m in 4mm SWA)

Well if you connected them together it would no longer be TT, but nobody
should have said that isn't allowed. It depends what you're intending to
do in the shed and whether the equipotential zone concept can be properly
applied there. If you search Google groups for "shed electrics" you'll
find plenty of previous threads to muse over.

(It's the garage, the shed uses the house earth, as it is close to the
house)
In the garage, the power is just for a couple of flurecent lights, a 12v PSU
for some CCTV cameras & alarm sensors
and a few sockets for general use (battery chargers, lead lamps, very
occational DIY tools like drills/ jigsaws
possibly a pressure washer once in a blue moon.

There isn't going to be any fixed appliances, or anything high demand.

Would it be better/safer etc, to have an earth rod in the garage, AND
connect it to the house earth (Via a 4mm conductor)?
Or just use the house earth
Or just use the rod?

Ta!

Sparks...