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)
