I have the very annoying problem of not having grounded wall sockets in an old house. Because of this, e.g. my large SMPS has a voltage potential of 115V AC to a ground wire I pull to a radiator. Hardly best practice, I just use it to ground myself before handling ESD sensitive stuff. Now I bought a 'ground spear', and need to know a few things:
What things absolutely must be grounded?
How can I best ensure a long life with regards to weather, contact between the ground spear and wires.
What type of wire should I use? I expect copper will oxidize rapidly once exposed.
How deep should I bury it?
Can I use a system of diodes to prevent voltage from the grounding wire killing my electrical devices? I don't expect this, but I would rather not explain to an insurance agent that my ground wire was played with. Note that I have both DC and AC to ditch from various devices.
And last, but not least stupidly, I want to be certain ground is ground, and that from A (my apartment) to B (the earth), I have continuity. I want to trip a relay instantly if GND is not on the line, so to speak, and alert me with a buzzer. My janitors are morons, and may interfere with my ground wire. It's no use explaining it to them. I'm adept enough to build a sensor - but what should I sense for? And how should I go about filtering out transients and a bit of AC on the wire being sensed upon?
Thanks, you boys are the best. Cluebats at the ready!