Table 2-1. Grounding electrode conductor for alternating current systems
Figure 2-5. Ground conductor installed on a metallic water pipe
e. A ground conductor hooked to a metallic water system must be continuous (without splices)
from the power panel, the water system, and the grounding rod (Figure 2-6).
f. Aluminum or copper-coated aluminum conductors will not be placed closer than 18 inches
from the soil.
g. Aluminum or copper-coated aluminum conductors will not be placed in direct contact with
masonry. When aluminum is placed in contact with soil and masonry, corrosion occurs at an accelerated
rate. This corrosion is called electrolysis.