|NEC Article 250 Page 2 of 6
250.4 General Requirements for Grounding and Bonding
Section 250-2 in the 1999 NEC was revised
and relocated to 250.4. It now reads:
To ensure a safe electrical system,
the following requirements identify the purpose of grounding and bonding of
electrical systems. The requirements contained in other sections of Article 250
must be followed so that the electrical system will be safe from dangerous
(A) Grounded Systems.
(1) Electrical System Grounding.
Grounded electrical systems (transformer, generators, etc) must be connected
to earth for the purpose of limiting the voltage imposed by lightning, line
surges, or unintentional contact with higher voltage lines, by shunting the
energy to the earth. In addition, electrical systems (power supplies) are
grounded to the earth for the purpose of stabilizing the voltage to earth during
Author's Comment: An "electrical system" as used in this subsection refers to the
"source" such as the transformer/generator.
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