Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [email protected]
Document ID: 4557
SSD Installation Instructions
Published Date: 2019.08.20
INSTALLATION INSTRUCTIONS
These general instructions apply to all applications.
Worker Safety
For worker safety during installation, it is recommended that
the user obtain certain equipment; namely a pair of electrically
insulated gloves, a shorting cable approximately 3 ft (0.91 m)
long 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 lead to the structure
rises to an unsafe potential when it is disconnected during
the installation process or if an electrical disturbance occurs
while the decoupler is being installed. Be sure to remove the
grounding jumper after the decoupler is completely installed.
If the structure voltage is not at a safe touch potential
(i.e.,>15VAC to ground per NACE SP0177), then insulating
gloves should be used.
Mounting
Mount the SSD so that the total length of conductor to the
connection points will be as short as possible if the SSD is going
to be used to provide over-voltage protection from lightning.
All conductors have inductance which will cause a significant
voltage per unit of conductor length when subject to lightning
surge current. To minimize the voltage developed between
the connection points, install the SSD as close as practical to
the required connection points and cut the conductor to the
shortest possible length during installation. For most insulated
joint applications the SSD can, and should, be installed with
less than 8” (200 mm) of conductor. Conductors can develop
1-3 kV/ft. (approx. 3-10 kV/meter) of length due to lightning;
hence, for this reason, leads should be kept as short as
possible in lightning applications. Conductor length is not
critical for limiting voltage due to 50 Hz or 60 Hz current.
Mounting Accessories
Numerous mounting accessories are available from Dairyland
to aid in the proper installation of the PCR. Full details and
complete installation instructions are available on the Dairyland
website here:
Dairyland Accessories.
Specific Installation Guidance
The Dairyland website contains detailed information on
the installation methods specific to a given application.
For wiring diagrams and/or application guidance, see
Dairyland Applications.
Environmental Exposure
The SSD enclosure is rated IP68 and is suitable for indoor
or outdoor use, in submersible and non-submersible
applications. SSDs may be submersed in non-freezing
conditions up to 6.5 ft. (2 m) depth for occasional prolonged
periods, though not continuously.
The unit must be installed in environments with ambient
temperatures of -49ºF to +149ºF (-45ºC to +65ºC).
Polarity
If the SSD purchased has asymmetrical blocking characteristics
and it is being connected between a cathodically protected
structure and ground, connect the negative terminal of the
SSD to the cathodically protected structure and the positive
terminal to ground. If being connected between two different
cathodically protected systems, attach the negative terminal
to the more negative structure and the positive terminal to the
less negative structure. A label on the SSD housing shows the
polarity of each terminal.
Enclosure
The standard enclosure is rated IP68 to 2 m depth (comparable
to NEMA 6P). This enclosure is suitable for submersible
applications.
Ambient Operating Temperature
-45ºC to +65ºC.
Field Testing
Before installation, the following measurements are suggested
to confirm that the steady-state conditions imposed on the
SSD will be within its ratings.
1. Measure the open-circuit DC voltage between the SSD
connection points with a multimeter. The open-circuit DC
voltage measured should be within the DC blocking voltage
rating of the model selected (i.e., normally -3.0 V/+1.0 V or
+/-2.0 V, unless a custom version has been ordered).
WARNING:
During installation, the voltage on the structure may rise
to an unsafe level (i.e., due to induced AC, AC fault or
lightning on the structure). Sparking and current flow may
occur when connecting or disconnecting decouplers or
over-voltage protectors. Assure that this does not occur
in hazardous locations where gases or vapors may be
present. All necessary safety precautions must be taken
by the user to avoid unsafe worker conditions, including
arcing, in accordance with applicable industry and/or
company-required practices. Dairyland provides suggested
procedures for installing and operating this equipment
(See the section on Worker Safety). But the user must be
responsible for and approve the procedures to be used by its
workers when installing the equipment because Dairyland
cannot be familiar with each user’s safety guidelines.
CAUTION:
Note: Explosion Hazard - Substitution of any component
may impair suitability for Class I, Division 2.
