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

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES AC POWER SPD REQUIREMENTS
Main Service
Disconnect
Meter
To Alarms Panel
(Recommended)
SPD
(Surge Suppressor)
Type 1 SAD/MOV
Utility
Panelboard
Type 3 SPD optional
when greater than
10 conductor feet
from panelboard.
Utility Feed
AC
240/120 Single Phase
208/120 3 Phase
Non-Critical
Loads
To Alarms Panel
NOTES: 1. The main service disconnect may be an integral part of the Utility Panelboard.
2. The main service disconnect and Utility Panelboard are collocated within the equipment area.
3. The Type 1 SPD shall be installed per the manufacturer's installation instructions.
4. All conductors between the SPD and the associated disconnecting device (60 Amp
Circuit Breaker typical) shall be as short as possible and routed together with a minimal
number of bends or angles of less than 90 degrees.
5. The SPD disconnecting device should be installed in the top most space available within the panelboard.
6. Installation of Type 3 SPDs on each critical load is recommended where the level of exposure is high.
7. Installation of Type 3 SPDs on each non-critical load that is located greater than 3 m (10 ft.) of conductor length from the
panelboard is recommended where the level of exposure is high.
FIGURE 7-2 SPD INTERCONNECT BLOCK DIAGRAM ‘A’
68P81089E50-B 9/1/05 7-11
UPS
Shelter, equipment room or area.
UPS
Panelboard
Type 3 SPD
optional
Critical
Loads