7. The lead kits provided will be for installation to either an SSD
or PCR decoupler. All leads are extra flexible #2AWG, 32” long.
(The version for the PCR-15KA is #2/0 AWG.) The leads for in-
stallation to a PCR will have compression connectors on each
end for ½” bolts. The leads for installation to a SSD will have a
compression connector on one end for a ½” bolt and on the
other end for a 5/16” bolt. Confirm you have the correct lead kit
by checking the terminals on the ends of the leads as illustrated.
8. Apply Tef-Gel corrosion inhibitor (provided) to the threads of
the studs. For connection to any pedestal version, place each
lead with a terminal for a ½” stud over each of the two studs
from the isolation switch followed by a ½” hex brass nut, ap-
plying Tef-Gel to the terminal faces. Tighten each nut with a
3/4” wrench to an estimated 20-25 ft-lbs of torque while holding
the terminal in position so it will not rotate. The leads should be
directed toward the open end of the cover. Slightly bend the
terminal near the bottom end of the cover away from the wall of
the cover as illustrated which will make is easier to replace the
cover on the pedestal base in a later step.
9. It is important to know the voltage associated with the pipe-
line leads to be handled during the installation process. Do not
contact the decoupler terminals or existing wiring connections
before determining if such action is safe. If NACE guidelines
were followed for the AC mitigation design, the voltage mea-
sured should, but may not be, less than the 15Vac that NACE
considers safe, which is the reason for recommending this
measurement. Your company may have a different, and lower,
voltage limitation for safety. It is recommended that the installer
measure the ac voltage from the negative decoupler terminal
(the connection to the pipeline) to an earth reference (e.g., a
long shank screwdriver or a reference cell) contacting the earth
where the worker will be standing to install the switch, as this will
represent the worker touch potential. If the voltage measured is
not considered safe, which is not expected to be the case, then
use electrically insulated gloves when removing the lead from
the negative decoupler terminal. The use of insulated gloves is
not shown in the following steps. Their use, if required, will make
the installation more difficult, but should be used whenever the
touch potential is above either your company’s safety guide-
lines or NACE guidelines.
10. Regardless of the voltage measured in Step 9, as a precau-
tion connect the black clamp of the jumper cable to the positive
terminal of the decoupler and connect the red clamp to the con-
nector (not the decoupler terminal pad) on one of the conduc-
tors attached to the negative decoupler terminal (if there is more
than one). The reason for this step is that the voltage on this
pipeline conductor may shift higher when it is removed from the
decoupler negative terminal when not grounded. In addition,
transient electrical effects on the pipeline must be addressed.
The following photos show shorting jumpers installed on typical
decoupler terminal arrangements.
11. If the ac voltage measured in step 9 was safe, proceed
without using insulated gloves but take care not to dislodge
the shorting jumper. Remove the negative decoupler lead us-
ing a set of 1/2” wrenches if disconnecting from an SSD or ¾”
wrenches if disconnecting from a PCR. Leave the grounding
jumper connected to this lead as illustrated during this process.
12. Using the nut, bolt, and washers provided with the lead kit,
splice the lead just removed from the decoupler negative ter-
minal to the terminal of the lead installed to innermost isolation
switch stud inside of the pedestal cover by bolting the terminal
ends of these leads together. Apply Tef-Gel to all flat mating
surfaces of the terminals and to hardware threads. Place a flat
washer under the bolt head and a flat washer, lock washer, and
nut on the other end of the bolt after it is inserted through both
terminal holes. Tighten the nut on the bolt firmly. If there is more
than one lead from the pipeline, up to three pipeline leads can
be spliced together as illustrated in the photo below on the right.
Alternately, the MTR-1 Terminal Extension Kit may be used to
Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
Terminal for 5/16” bolt (left), 1/2” bolt (right)
