3 ms·
That sounds smart, though I can't imagine a huge copper bar came cheap. You can get something for as little as $17 off Amazon, and maybe cheaper if you look ha
by mises 8y ago
That sounds smart, though I can't imagine a huge copper bar came cheap. You can get something for as little as $17 off Amazon, and maybe cheaper if you look harder: https://www.amazon.com/Skywalker-Signature-Ground-Rod-4ft/dp/B009OMMRMO/ https://www.amazon.com/Skywalker-Signature-Ground-Rod-4ft/dp...
- mindslight 8y agoGrounding rods are generally copper clad steel. In the US, proper ones are 8ft. $13 at Home Depot. An electrician can either measure the actual impedance or put in two rods with some spacing, so they're often just used in pairs. Back when Radio Shack was closing I put the damper on some guy who was going to buy all the grounding rods thinking he'd scrap the copper. I did him the favor of disappointing him before he spent his money.
- nielsbjerg 8y agoDoes not have to be copper. I've done several of these using galvanized steel hammered into the ground. We'd hammer in rods of 2 meters length until the resistance was low enough (around 1600 ohms Iirc). This would ensure hpfi tripped below 50mA