What is a Grounding electrode system?
The grounding electrode system is a method by which the neutral and grounding conductors are connected to the common “earth” reference. The connection from the electrical system to the grounding system is made in only one place to avoid ground loops. The grounding electrode system is not intended to carry much current. Ground faults (Ie: hot to grounded case short) are conducted down the ground wire to where it is interconnected with the neutral and hopefully the breaker/fuse trips. The grounding electrode does not participate in such a situation. While the conductors involved in this are relatively large, they’re sized for lightning strikes and other extremely short duration events. The grounding electrode system is specifically not expected to have enough conductivity to trip a 15A breaker. The grounding electrode often has a moderately high resistance. For example, according to the NEC, an acceptable ground electrode system may have 25 ohms of resistance – only 5A at 120V, not enoug
