Updating electrical wiring
The trigger level for a GFI is 6 milliamps for 40 milliseconds.Most people wouldn’t experience shock or electrocution if the current flowing through them is less than 6 milliamps for that short a time.The “ground wire,” more correctly called the equipment ground, is there so that if any metal part of an appliance, tool, lamp, or the like becomes energized, the circuit breaker will trip and keep you from being electrocuted or shocked should you touch the metal part.
Do an "electrical inventory," creating a list of all the devices you’ll be using in the house, and where.
Some electrical appliances (such as a surge protector for a computer) should be on a circuit with an equipment ground, but most appliances are doubleinsulated. Rewiring is the best approach, but it is much more expensive than the options I outlined above and is not essential to achieve a good degree of safety.
Old houses often need updates to electrical systems; the author’s 1903 home was no exception.
How do you get a grounding receptacle outlet in an old system?
The code allows a grounding conductor to be run along the existing wiring to the grounding bar on the panel where the circuit originates.If this happens with a grounded tool, a short circuit is created, and the breaker trips.