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STANDARDS AND GUIDELINES FOR COMMUNICATION SITES AC POWER SPD REQUIREMENTS
7.4.3 INSTALLATION REQUIREMENTS
All SPDs shall be installed per the manufacturer’s installation instructions and in accordance with all
applicable codes. Type 1 and Type 2 devices shall be securely attached to the mounting surface and
shall not depend on the interconnecting raceway for support.
7.4.3.1 LOCATION
When selecting the location, consideration must be given to conductor routing, length and required
number of bends in each conductor. The SPD shall be installed as close as possible to the associated
main disconnect or panelboard, and in a location that permits the shortest and most direct electrical
connection. The most suitable location is immediately adjacent to the associated panelboard keeping the
conductor length as short as possible. To accommodate this specification some manufacturers have
developed specific models for installation directly above, below, or to the right or left of the associated
panelboard.
7.4.3.2 INTERCONNECTING RACEWAY OR CONDUIT
The raceway or conduit between the panelboard (or disconnecting means) and the SPD shall be sized
for the size and number of conductors to be routed through it. A non metallic conduit (such as PVC) or
raceway is recommended. The length shall be as short as possible. This raceway shall be routed as
direct as possible between the SPD, the disconnecting means (if a separate enclosure is used), and the
associated panelboard. The raceway or conduit shall not be used as a support for the device.
7.4.3.3 CIRCUIT BREAKER OR DISCONNECTING MEANS
The SPD shall be wired through a 60-Ampere (or larger) circuit breaker, NFPA 70-2005, Article 110.9,
or in accordance with local jurisdictional codes.
7.4.3.4 CONDUCTOR SIZE, LENGTH AND ROUTING
Conductor size, total circuit length, and routing are critical to proper SPD performance. The conductor
shall be of the minimum size recommended by the manufacturer, however, shall not be smaller than
16 mm 2 csa (#6 AWG). Larger conductor sizes are most desirable. A maximum conductor length of
610 mm (2 ft.) is most desirable. The conductors shall be routed together and shall be free of sharp
bends or angles of less than 90 degrees.
7.4.3.5 PERFORMANCE EVALUATION
SPDs shall be evaluated using the specific criteria outlined in “AC Power Line SPD Test Certification
Requirements” on page 7-47, and shall meet the requirements established in this section and Table 7-4
on page 7-32. Devices that do not meet this minimum criteria shall not be furnished, installed, or
recommended for installation.
68P81089E50-B 9/1/05 7-33