Download Q&A

6.3
COMMUNICATIONS SURGE PROTECTORS
This article sets forth the specifications for two (2) types of communications surge protectors: one (1)
which mounts directly on telephone-type quick-connect blocks and one (1) which mounts in a socket.
6.3.1
General Requirements
All communications surge protectors shall conform to the following requirements.
•
•
Surge current occurrences at:
2000 amperes, 8 x 20 microsecond waveform:
at least 80
400 amperes, 10 x 700 microsecond waveform:
at least 80
Peak surge current for:
8 x 20 microsecond waveform:
10,000 amperes
(2,500
amperes/line)
10 x 700 microsecond waveform:
•
Response time:
•
Series resistance:
•
Capacity, average:
•
Temperature range:
•
Clamp voltage:
500 amperes/line
less than 1 nanosecond
15 ohms, maximum
1500 picofarads
-40 to +85 degrees Celsius
As specified on bid list or as required to match equipment in application.
The unit shall be a hybrid device with the first stage formed by a 3-element gas tube that
will withstand a peak surge current (8 x 20 microsecond waveform) of 10,000 amperes
per side. The second stage shall dissipate at least 1.5 kilowatts.
No tools shall be required for the insertion and removal of the surge protector.
6.3.2
Type Q Communications Surge Protectors
Type Q communications surge protectors shall conform to all of the requirements of
paragraph 6.3.1 and shall be for use on communications circuits which are not subject to
high-voltage ringing currents. The Type Q surge protector shall mount on and connect
directly to a standard telephone-type quick-connect block (ATT Type 66M1 or
equivalent). The Type Q surge protector shall have dimensions that allow Type Q surge
protectors to be mounted adjacent to each other on the same quick-connect block in a
way that does not render any of the quick-connect block terminals useless. The surge
protectors shall have finger grips on one end for easy removal.
Traffic Signal Specifications
April 1998
Section 6
Page 3 of 4