standards and guidelines for communication sites - Radio And ...

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES AC POWER SPD REQUIREMENTS
Electrical meter and
service disconnect are
located within another
building or shelter. The
pole or pad mounted
equipment is fed as a
branch circuit from a main
or sub panelboard within
that structure.
NOTES:
Main or Sub
Panelboard within
another building
or shelter
7.4.2 SPD TYPES
To Alarms Panel
(Recommended)
SPD
(Surge Suppressor)
Type 1 or Type 2
optional
Utility
Panelboard
See Note 1
All Loads
Stand alone Pole or Pad mounted equipment
cabinet with single Repeater, Base Station,
Receiver or Control Station.
1. A disconnecting device is required within the pole or pad mounted cabinet. This may be a single disconnect if no
Type 1 or Type 2 SPD is installed and there is only one load.
2. When installed the Type 1or Type 2 SPDs shall be installed per the manufacturer's installation instructions.
3. All conductors between the SPDs and the associated disconnecting device shall be as short as possible and routed
together with a minimal number of bends or angles of less than 90 degrees.
4. The SPD disconnecting devices should be installed in the topmost space available in the Utility Panelboard.
6. Installation of Type 3 SPDs on each load is required unless a Type 1 SPD is installed on the Utility Panelboard.
FIGURE 7-18 SPD INTERCONNECT BLOCK DIAGRAM ‘Q’
SPDs used for AC power protection referenced in this section are defined as Type 1, Type 2, or Type 3
and are defined below.
Table 7-4 on page 7-32 lists required specifications for various SPDs.
7.4.2.1 TYPE 1 PANEL TYPE SURGE SUPPRESSION DEVICE
Type 3 SPD required
for all equipment
loads
Type 1 SPD provides protection for the service entrance, and all branch panel locations within the same
equipment room. The requirements are as follows:
• The device shall consist of primary modules using SAD technology and secondary modules using
MOV technology.
• The SPD shall be a permanently connected, one-port, or parallel configuration
• The suppression components shall be voltage limiting type. Voltage switching components shall
not be utilized as a suppression element in the SPD.
• All suppression modules shall be installed from each phase conductor to the neutral conductor
(L-N, Normal Mode).
68P81089E50-B 9/1/05 7-27