2103 Secondary Surge Protector
Installation Guide
Overview
Teledyne Isco’s 2103 Modem Module has internal
protection for differential voltages and large current
flows on the tip and ring conductors of a phone line.
However, since the 2103 is powered by batteries, it lacks
a ground reference and does not have protection from
common mode voltages. In certain situations, such as a
lightning strike, large currents could be sent through the
2103 and attached 2150 down to the probe and into the
stream, resulting in damage to the equipment.
Installation of the 2103 Secondary Surge Protector
provides additional protection against a close proximity
lightning strike. It does this by using a low impedance
Ground Equalization Conductor (GEC), which equalizes
the ground potential at the 2150’s probe with that at the
primary earth ground.
Installation
The Surge Protector Kit (P/N 60-5314-493), shown in
Figure 1, contains the following items:
●
30
Cable tie fasteners
●
2
5/16” #4-40 flat head screws
●
2
1/4” #4-40 flat head screws
●
1
50 foot Ground Equalization Conductor
●
1
Secondary Protector
Figure 1: Secondary Surge Protector Kit
CAUTION
The surge protector kit is not to be installed in an
environment that is classified as a Hazardous Location.
This kit has not been certified to be safe or to make
equipment safe in environments defined as hazardous.
The preferred configuration is shown in Figure 2,
which shows a site where the 2103 is within twelve feet
(cable route) of the primary earth ground.
Figure 2: Preferred Installation Configuration
If the 2103 is more than twelve feet from the primary
ground, an additional earth ground will be needed. This
second grounding point should be as close to the 2103
as possible, but outside of the manhole. When using this
configuration, the secondary protector and the GEC
should be connected to the secondary ground instead of
the primary ground.
Note
To prevent an excessive amount of energy from being
dissipated through the manhole, the primary earth
ground must be of highest quality.
Follow the steps below to install the secondary surge
protector:
1. Remove the 2150 and 2103 from the manhole.
2. Extract the mounting ring with probe from the
sewer. Remove the old cable ties holding the
probe to the mounting ring and remove the
probe from the ring. Clean off the ring, probe,
and cable
3. Mount the GEC to the probe, as shown in Figure
3. Use the longest set of screws in the kit to
securely mount the GEC and probe to the mount-
ing ring, as shown in Figure 4.
Secondary
Protector
Ground Equalization
Conductor and
Connector
Cable Ties
and Screws
Battery
Ground
Equalization
Conductor
Outside Manhole
Inside Manhole
2103
2150
Mounting
Ring
Probe
T elephone
Line
Stream
Protector
Protector
1st
2nd
Primary Earth
Ground
Instruction Sheet
Revision C, September 18, 2009
