Installation guide

126 Appendix C/National Electrical Code
The following is the portions of the 1993 National Electrical Code that pertains to the installation of the
Digital Satellite Systems. These are only pieces of the complete code and if there are any questions the
National Electrical Code handbook should be consulted. Also, before doing any installations in an area, it
is important to check for any local codes that would pertain the installation of the system.
250-1. Scope
This article cover general requirements for grounding and bonding of electrical installations, and specific requirements in (a)
through (f) below.
(a) Systems, circuits, and equipment required, permitted, or not permitted to be grounded.
(b) Circuit conductors to be grounded on grounded systems.
(c) Location of grounding connections.
(d) Types and sizes of grounding and bonding conductors and electrodes.
(e) Methods of grounding and bonding.
(f) Conditions under which guards, isolation, or insulation may be substituted for grounding.
Z50-81. Grounding Electrode System.
If available on the premises at each building or structure served, each item (a) through (d) below, and any made electrodes in
accordance with Sections 250-83 (c) and (d), shall be bonded together to form the grounding electrode system. Interior metal
water piping located more than 5 feet (152 cm) from the point of entrance to the building shall not be used as a conductor to
interconnect the electrodes and the grounding electrode conductor. The bonding jumper shan be installed in accordance with
Sections 250-92 (a) and (b), shall be sized in accordance with Section 250-94, and shall be connected in the manner specified
in section 250-115. The unspliced grounding electrode conductor shall be permitted to run to any convenient grounding
electrode available in the grounding electrode system. It shall be sized for the largest grounding electrode conductor required
among all the available electrodes.
(a) Metal Underground Water Pipe.
A metal underground water pipe in direct contact with the
earth for 10 feet (3.05m) or more (including any metal well
easing effectively bonded to the pipe) and electrically
continuous (or made electrically continuous by bonding
around insulating joints or sections or insulating pipe) to
the points of connection of the grounding electrode con-
ductor and the bonding conductors. Continuity of the
grounding path or the bonding connection to interior piping
shall not rely on water meters. A metal undergroundwater
pipe shall be supplemented by an additional electrode of a
type specified in Section 250-81 or in Section 250-83. The
supplemental electrode shall be permitted to be bonded to
the grounding electrode conductor, the grounded service-
entrance conductor, the grounded service raceway, or any
grounded service enclosure.