Heimiko,

You need to hire an electrician immediately to ground your outlets - at
least the ones where you have devices with metal enclosures plugged in,
but preferably all of them. 

To save money you can alternatively install GFI breakers directly in
place of a 2-prong outlet, instead of installing a ground wire. This is
NOT going to protect from an uncomfortable shock, but it will prevent
lethal currents. The national US electric code allows this, although
local building codes sometimes require all GFIs to be grounded. You
don't need one for every outlet, only the first one on each circuit.

Running an external ground wire to a radiator is probably better than
nothing in your situation, but it's not ideal and it's not up to code.
_Cold_ water pipes are OK, provided you know that the piping is all
metal (i.e. no PVC anywhere). The connection should be made in the
crawl space or in the wall though, not by running wires in the living
spaces. 

Given your situation, the best solution is probably to establish a new
ground "bus" for the whole house, consisting of a heavy gauge wire
connected to the main breaker panel and going the shortest possible
route from the one end of the house to the other. Then tie all the
outlets onto that. This will provide the lowest possible resistance
from any outlet to earth, and to each other.  Make sure the main
breaker panel is tied with heavy copper wire to a proper ground rod
driven into the soil. 

Also if you have sub-panels, make sure that the _neutral_ bus (white
wires) is NOT connected to ground in the subpanel. It should only be
tied to ground at a single point in the main panel.

I'm not an electrician and this is by no means a complete checklist of
what to fix. Good luck!

Sean


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seanadams
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