Question 1 of 10
According to the NEC, what is the minimum length of a metal underground water pipe that must be in direct contact with the earth to qualify as a grounding electrode?
The NEC requires a minimum of 10 feet of contact with the earth for metal underground water pipes used as grounding electrodes.
Question 2 of 10
What is the primary reason a water pipe electrode always requires a supplemental electrode?
Utilities may replace metal water pipes with PVC pipes in the future, rendering the water pipe ground ineffective without a supplemental electrode.
Question 3 of 10
For a concrete-encased electrode (Ufer), what is the minimum length of bare copper conductor required?
The Ufer ground requires at least 20 feet of bare copper conductor.
Question 4 of 10
What is the minimum diameter of steel reinforcing bars (rebar) allowed for a concrete-encased electrode (Ufer)?
The rebar used in a Ufer ground must have a minimum diameter of 1/2 inch.
Question 5 of 10
What is the minimum length of a rod or pipe electrode that must be in contact with the earth?
Rod and pipe electrodes require a minimum length of 8 feet in contact with the earth.
Question 6 of 10
If a rod electrode hits rock, what is the maximum angle it can be driven at?
If rock is encountered, the rod can be driven at an angle up to 45 degrees.
Question 7 of 10
What is the minimum size of a ground ring conductor?
The minimum size for a ground ring conductor is 2 AWG bare copper.
Question 8 of 10
What is the minimum length of a ground ring?
A ground ring must have a minimum length of 20 feet.
Question 9 of 10
At what depth must a ground ring be buried?
A ground ring must be buried at least 30 inches deep.
Question 10 of 10
What is the minimum surface area of a plate electrode that must be exposed to the soil?
A plate electrode must expose a minimum of 2 square feet to the soil.
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