Dairyland SWX-100-PED User manual

External Isolation Switch
Installation and Operating Instructions
SWX-100-PED
INTRODUCTION
The Dairyland Isolation Switch, model SWX-100-PED, is
designed to be externally mounted to the cover of Dairyland
pedestal models including the current MTP-36 pedestal as
well as older generation MTP-36 pedestals and discontinued
MTP-42 pedestals. These instructions address connection of
the switch to a PCR or SSD model installed in any of the ped-
estal models listed and assumed to be in service.
Each Isolation Switch must be ordered with a lead kit unique
to the decoupler model to which it will be connected. Lead
kit model MTL-2-32-SWP is required for connection to a PCR
rated 10kA and below, model MTL-2/0-32-SWP is for use with
PCR models rated 15kA, and model MTL-2-32-SWS for con-
nection to an SSD.
WORKER SAFETY
For worker safety during installation, it is recommended that
the user obtain certain equipment; namely a pair of electri-
cally insulated gloves, a shorting cable of approximate 3 ft
length with insulated clamps on each end, and a multi-meter
to measure ac voltage. (Of these items, Dairyland offers
a suitable 3 ft long 1/0AWG shorting cable with insulated
clamps, Model# BCL-1/0 for decouplers rated 10kA or higher
or Model# BCL-2 for decouplers rated less than 10kA.) The
following installation procedure assumes that these items are
available. It is suggested that a grounding jumper be used
as a safety precaution in the event the pipeline lead rises to
an unsafe potential when it is removed from the decoupler,
which is a necessary step during the installation process or if
an electrical disturbance occurred while the Isolation Switch
is being installed. If the voltage one is working with is not at a
safe touch potential (i.e., >15Vac to ground), then insulating
gloves should be used.
Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
3567 - Rev. A - August 2015
WARNING:
When isolation switches are used in ac voltage mitigation
applications, if multiple or all decouplers are disconnected,
the pipeline voltage may rise to an unsafe level (i.e., above the
15Vac that NACE standards consider safe). Therefore, safety
precautions should be taken by the user when decouplers
used for ac voltage mitigation are isolated from the pipeline,
particularly at any pipeline contact point. Dairyland provides
suggested procedures for installing and operating the Isolation
Switch, but the user must be responsible for and approve the
procedures to be used by its workers when initially installing the
Isolation Switch in a field retrofit installation because Dairyland
cannot be familiar with each user’s safety guidelines.
WARNING:
Measure the ac voltage at the decoupler, as outlined in step 9,
before contacting any terminals or connections, and follow the
described safety procedures.
CAUTION:
When a decoupler is being used to provide ac grounding
for electrical equipment, via installation in a code-covered
grounding conductor or bond, an Isolation Switch should not
be installed because per electric codes such equipment must
always be solidly AC grounded under all conditions.
Model SWX-100-PED
WARNING:
Isolation Switches are not to be installed in a defined hazardous
location, but rather in an “ordinary” location. Model: MTL-2-32-SWS (SSD)
& MTL-2-32-SWP (PCR)

REQUIRED TOOLS
Required user-furnished installation tools include: (a) a ratchet
wrench with ½” and ¾” sockets, (b) a ½” and ¾” box end
wrench, (c) a battery operated drill with a 9/16” drill bit, (d) a
center-punch, (e) a suitable grounding jumper and electrically
insulated gloves as mentioned above, (f) electrical insulating
tape, (g) a multimeter to measure ac voltage, (h) and a padlock
that fits a 7/16” hole in the isolation switch latch.
INSTALLATION PROCEDURE FOR ANY PEDESTAL
OR DECOUPLER MODEL
Note: The photos used in the installation steps will show the switch being
connected to a SSD in a now discontinued MTP-42 pedestal. All steps remain
the same regardless of mounting pedestal model number.
1. Two 9/16” holes are required in the pedestal cover to mount
the isolation switch. It is very important to install this switch to
the one correct face of the cover for each pedestal model.
2. The correct cover face on the standard Dairyland pedestal
(MTP-36) is the face on which the head of the two pedestal cov-
er latch pins are visible near the bottom end of the cover. Two
9/16” holes in the cover are required for mounting the isolation
switch. Use the “Hole Location Template and Drilling Instruc-
tions” furnished with each isolation switch to drill these holes
and then remove the pedestal cover and lay it at it so the two
holes are on the right or left side. Hole location is very important.
See Appendix for template information.
3. Open the isolation switch cover. If ON appears above the
right corner of the pull-out switch, then pull out by the handle,
rotate 180° and plug back in so OFF appears below the left cor-
ner of the pull-out switch and close the cover. If OFF appeared
when the cover was rst opened, then leave as-is and close the
cover.
4. Remove the two brass nuts and stainless washer from each
stud projecting from the bottom of the enclosure, but leave the
two rubber gaskets on each stud.
5. Insert the two ½” studs of the switch through the two holes
drilled in the pedestal cover so the switch is upright (i.e., so the
nameplate is readable when the cover is later reinstalled on the
base). It may be necessary to slightly force the two studs closer
together or further apart to insert through the two holes if they
were not drilled precisely per the template hole location marks.
6. On the inside of the pedestal cover, install on each stud one
stainless steel washer and one hex brass nut threaded all the
way on the stud hand tight. Using a ¾” box wrench or ratchet
wrench, tighten each brass nut until the ange of the enclosure
is snug against the outside wall of the pedestal cover to assure
a good seal, but do not over tighten. Stop tightening when the
force required to turn the nut rather abruptly increases.
Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
Required Tools Grounding Cables: BCL-1/0 (Le) BCL-2
(Right)
MTP-36 Cover Face
Switch On Switch O
Note: When the installaon is to a PCR rated 10kA or higher, the BCL-1/0 grounding
cable is suggested and for any SSD, the BCL-2 is suggested.

7. The lead kits provided will be for installation to either an SSD
or PCR decoupler. All leads are extra exible #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. Conrm 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 difcult, 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 at mating
surfaces of the terminals and to hardware threads. Place a at
washer under the bolt head and a at 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 rmly. 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 (le), 1/2” bolt (right)

connect up to 5 leads (see the Installation Instructions for the
MTR kit at www.dairyland.com). Continue to leave the ground-
ing jumper connected.
13. Since the isolation switch was previously placed in the OFF
position (i.e., switch open) in step 3, the lead to be reconnected
to the decoupler negative terminal in this step is not connected
to the pipeline so it can be installed by hand. Take the lead
that was connected to other isolation switch stud near the bot-
tom end of the pedestal cover, bend it over the top edge of the
pedestal base and form it so the terminal on this lead comes
straight up to the decoupler terminal as illustrated in the left
photo below. Apply Tef-Gel to the terminal pad that will be in
contact with the negative decoupler terminal. Use the hardware
that was removed from this decoupler terminal in an earlier step
and bolt these connections together tightening securely. After
this connection is completed, open the cover on the isolation
switch enclosure, pull out the switch mechanism, rotate 180°
and reinsert fully. The switch is now ON with the decoupler con-
nected to the pipeline.
14. Remove the grounding jumper because the pipeline is now
grounded through the decoupler and switch. As a precaution,
insulate the bolted splice joint done in step 12 with a materi-
al of the users choice to prevent this pipeline lead from being
touched whenever the pedestal cover is removed.
16. The pedestal cover can now be reinstalled over the pedestal
base as illustrated and the pedestal cover locked.
17. If the decoupler is to be left connected to the pipeline, no
further action is required because the pull out switch is already
ON (i.e., decoupler connected). If the decoupler is to be left
disconnected, then return the switch to its OFF position. Conrm
that the isolation switch is left in the desired position, then close
the isolation switch enclosure cover and lock. This completes
the installation instructions.
The isolation switch operating instructions are found inside
the enclosure cover. Read and follow these instructions. Cer-
tain steps recommend abruptly pulling out and reinserting the
switch mechanism and the reason for this is to minimize arcing
time on the switch contacts.
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] Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
Hole Location Template and Drilling
Instructions
This Isolation Switch can be mounted to
following Dairyland pedestals
Model MTP-36
Model MTP-42
1. See photo of each pedestal in the
instructions to determine the cover face
on which the isolation switch is to be
mounted. Do not mount on any other
cover face.
2. Align the bottom edge of this template
with the botton edge of the cover and
center it horizontally between the right
and left cover edges.
3. Carefully center punch mark the two
holes. The 6.856" dimension is critical.
4. Drill through the pedestal cover wall
with a 9/16" (0.531") drill bit but no more
than necessary to prevent drilling into the
decoupler product inside of the pedestal.
Reconfirm spacing with drill template.
5. Mount the switch per instructions
provided.
6.856
3.0" above bottom edge
of pedestal cover.

9.32
236.7
7.32
185.9
6.2
157
5.05
128.3
2X
.50
12.7
HARDWARE
6.86
174.1
8.82
223.9
3.98
101.1
4X
.31
7.9 1.35
34.4
9.57
243
6.08
154.5
NOTE: PEDESTAL REQUIRED FOR INSTALLATION.
ORDER MTP-36, BCL-2 AND CONDUCTOR KIT
MTL-2-32-SWS FOR SSD, MTL-2-32-SWP FOR UP TO
PCR-10KA, OR MTL-2/0-32-SWP FOR PCR-15KA.
SHEET: SCALE
DWG SIZE DATE DRAWN DOCUMENT #
DESCRIPTION
SWX-100-PED Outline Drawing
100082
1
B
1:3
DRAWN:
ANGULAR: 1
1-PLACE / FRAC:
.03
UNITS: INCHES
2-PLACE:
.015
3-PLACE:
.005
UNLESS NOTED
ANSI Y14.5M 1994 APPLIES
63
OF
1
JPW
2015-07-29
REV
DWG APPROVAL:
DATE APPROVAL
TC
2015-07-30 A
DAIRYLAND
ELECTRICAL
INDUSTRIES, INC.
P.O. BOX 187
STOUGHTON,
WI 53589
608-877-9900
DAIRYLAND.COM