Dairyland SSD Series Installation Instructions Manual

ALWAYS RUGGED. ALWAYS RELIABLE.

Blocking Threshold

Terminal Arrangement

Solid-State Decoupler (SSD)

Installation Instructions

READ ENTIRE DOCUMENT BEFORE INSTALLING

INTRODUCTION

The Solid-State Decoupler (SSD) is a solid-state DC isolation/
AC grounding (i.e., coupling) device design ed for use in
conjunction with cathodically protected equipment located

in Class I, Division 2 hazardous (classied) locations or

ordinary (non- hazardous) locations. The SSD is suitable for:
(1) decoupling ground mats, (2) AC voltage mitigation, (3) over­voltage protection of insulated joints and similar structures and
equipment, (4) DC isolation and AC grounding of cathodically
protected structures and electrical equipment in cathodically
protected structures.

The SSD can be used in a variety of different applications,

each of which requires specic installation guidelines.

These installation instructions cover the following common
applications and arrangements.

• Over-voltage protection for insulated joints

• Decoupling gradient control mats

• Decoupling cathodically protected structures containing
electrical equipment from grounding systems

• AC mitigation

Some applications listed may not apply in some countries
due to different codes and practices. If your application is not
covered by these installation instruc tions, contact Dairyland.

Technical information for applications is available on the

Dairyland website.

Model Number Chart

Choose: 2/2 (Standard)

3/1 (Optional)

AC Fault Current

Note: For EAC products see separate EAC installation manual
available at www.dairyland.com

Choose: 1.2kA

2kA

3.7kA
5kA

Certications

The SSD has been tested by Nationally Recognized Testing Laboratories
(NRTLs) for compliance to independent standards in its operation, ratings,

and construction. Visit our website for Complete Certications and Listings.

Safety Grounding

UL (United States) and C-UL (Canada) listing for:
NFPA 70 (US National Electric Code - NEC), Article 250.2 and 250.4 (A)
(5), and CSA C22.1-12, Section 10-500 and 10-806. Over-voltage protection
from lightning per ANSI C62.11.

Blocking Cathodic Protection Current

NFPA 70, Article 250.6(E)

Hazardous Location Use

The SSD has been certied for use in Class I, Division 2, Groups A, B, C,

D hazardous locations to:

• NFPA 70 (U.S. National Electrical Code) sections 500-505

• ANSI/ISA 12.12.01-2011

• CSA C22.2 No.213-M1987 (R2008)

The SSD has been certied to ATEX Directive 94/9/EC and IECEx

requirements for use in Zone 2, Group IIC hazardous locations by UL/
DEMKO to: EN 60079-0:2012, EN 60079-15:2010, IEC 60079-0: 6th Ed,
IEC 60079-15: 4th Ed

Add “-R” for standard terminal arrangement

Remove “-R” for alternate terminal arrangement*

Certification System

Add “-EAC” for EAC version for Zone Class 2 Group IIC

Lightning Surge Current

Choose 100 for 2kA, 3.7kA, 5kA models

Leave blank for standard certifications

Choose 75 for 1.2kA models

Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [e-mail]

Document ID: 4557 SSD Installation Instructions Published Date: 2019.08.20

INSTALLATION INSTRUCTIONS

These general instructions apply to all applications.

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 ow 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.

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.

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.

Specic Installation Guidance

The Dairyland website contains detailed information on

the installation methods specic 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.

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 signicant

Field Testing

Before installation, the following measurements are suggested

to conrm that the steady-state conditions imposed on the

SSD will be within its ratings.

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

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).

Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [e-mail]

Document ID: 4557 SSD Installation Instructions Published Date: 2019.08.20

2. Measure the steady-state short-circuit AC-RMS current
between the SSD connection points with a clamp-on
ammeter. The short-circuit AC-RMS steady-state current
measured should be less than the steady-state AC current
rating of the SSD model ordered.

3. After installation, the DC voltage across the SSD terminals

can be measured to conrm that the expected value of
cathodic protection voltage exists, assuming the cathodic

protection system is ON. (The voltage measured with a
voltmeter will be less than the actual cathodic protection
voltage because it is not being measured with respect to a
reference cell.)

4. After installation, the steady-state AC current through the

SSD conductors can again be measured. The current
measured should be comparable to the value measured
prior to installation since the AC impedance of the SSD is
negligible (i.e., about 10 milliohms at 60 Hz).

5. To verify correct device operation while in service, measure

the pipe to soil voltage using a reference cell. An acceptable
CP reading will indirectly indicate correct operation with DC
isolation, as device conduction would bond the CP system
to ground (or to the other connected structure) and affect
the CP reading. While an indirect test, it has proven to be a
good indicator of operation. An unacceptable reading may
be due to other factors besides the Dairyland device, and if
needed perform the following additional tests.

GENERAL COMMENTS

The SSD does not require routine maintenance, but if the
cathodic protection voltage level near the SSD is below the

normal or expected value, it is suggested that the unit be eld

tested following procedures available from Dairyland.

If a problem is suspected, contact Dairyland for trouble­shooting assistance. If repairs are necessary the unit is to be
returned to Dairyland for diagnosis and repair after requesting
a Return Material Authorization (RMA).

The SSD is designed to fail as a short-circuit to assure safety

grounding at all times if the unit fails due to excessive AC fault

current or lightning current beyond rating.

ATEX AND IECEx COMMENTS

• The device shall be placed into service in accordance with
the ratings and limitations stated in the installation and
operating instructions.

• No ongoing maintenance is required, as the device is designed
to be maintenance-free, and is of solid-state construction with
no moving, wearing, or serviceable parts.

• During installation the device should be handled and mounted
in a location so that direct impact is minimized.

6. The denitive test is one performed with the device out of

circuit. If the device is in service, disconnect the CP structure
attachment conductor (typically at the negative terminal) so

that the product is isolated, but rst addressing any safety

issues such as adding a current-rated bonding jumper
between the two connection points, wearing insulating
gloves, etc. Note that if the Dairyland device is performing
mitigation of induced AC voltage, disconnecting the device
will leave the structure as an open circuit, and the induced
voltage on the pipeline may rise to high levels. Therefore,
take appropriate safety measures before proceeding.

Next, momentarily short the device terminals to remove

any residual charge that may be on the internal capacitor.
Connect a multi-meter, set to the lowest Ohms scale, across
the terminals. If the product is functional, the resistance
will start at zero ohms and then very slowly increase as
the capacitor in the decoupler begins to charge from the
multi-meter. The test may be discontinued at this point, as
charging the capacitor can take up to 10 minutes, and it is

only necessary to observe this general response briey. If
the product is failed, the reading will remain xed and at a

very low resistance value, typically a fraction of one Ohm.

If any measurements do not produce the expected results,

contact Dairyland.

• Regular testing of the device is not required. Users who
desire to verify the operating condition of the device should
refer to the section entitled “Field Testing.” Observe all safety
precautions described, in addition to industry or company
safety practices.

• WARNING: Potential electrostatic charging hazard – Plastic
enclosures are to be cleaned or wiped only with a damp cloth.

• Products marked CE, Ex II 3 G are Equipment Group II,

Equipment Category 3, and comply with the Essential
Health and Safety Requirements relating to the design and

construction of such equipment given in Annex II to the

Directive 94/9/EC.

• This equipment is intended for use in area in which explosive

atmospheres caused by gasses, vapors, mists, air or dust

mixtures are unlikely to occur, or are likely to occur only

infrequently and for short periods. Such locations correspond

to Zone 2 classication according to ATEX Directive 94/9/EC.

• This equipment complies with standards EN 60079-0:2012

and EN 60079-15:2010 per certicate number DEMKO 05
ATEX 0431689X and IEC 60079-0 Ed. 6 and IEC 60079­15 Ed. 4, per certicate number IECEx UL 14.0021X. The

Quality Assurance Report is based on ISO/IEC 80079-34:
Edition 1 2011-04.

Dairyland Electrical Industries • P.O. Box 187 Stoughton, WI 53589 • 608-877-9900 • www.dairyland.com • [e-mail]

Document ID: 4557 SSD Installation Instructions Published Date: 2019.08.20

1.00

25.4

3.97

100.8

.17

.33

8.3

.59

14.9

4.4

8.72

221.4

5/16"

HARDWARE

Negative
Terminal

10.00
254

12.00

304.8

.5

13

NOTE: Applies to all SSD models with standard terminal arrangement (-R model numbers)

2.31

58.8

1.00

25.4

Positive
Terminal

2.00

50.8

ANSI Y14.5M 1994 APPLIES

UNLESS NOTED
UNITS: INCHES
3-PLACE:
2-PLACE:
1-PLACE / FRAC:
ANGULAR:

.005

.015

63

.03

1

DAIRYLAND
ELECTRICAL
INDUSTRIES, INC.

P.O. BOX 187
STOUGHTON,
WI 53589
608-877-9900
DAIRYLAND.COM

DESCRIPTION

SSD Outline Drawing - All Models with Standard Terminals

DOCUMENT #

100074

SCALE

1:2

REV

A

DRAWN:

DATE DRAWN

2015-04-08

JPW

SHEET:

DWG SIZE

1

OF

DATE APPROVAL

B

2015-04-10

1

DWG APPROVAL:

HNT

3.50

88.9

2.22

56.4

1.00

25.4

3.97

100.8

.59

.33

8.3

14.9
.17

4.4

8.72

221.4

5/16"

HARDWARE

.5

13

2.00

50.8

Positive
Terminal

10.00
254

12.00

304.8

NOTE: Applies to all SSD models with an optional terminal arrangement

2.31

1.00

25.4

(non -R model numbers)

58.8

3.50

88.9

Negative
Terminal

ANSI Y14.5M 1994 APPLIES

UNLESS NOTED
UNITS: INCHES
3-PLACE:
2-PLACE:
1-PLACE / FRAC:
ANGULAR:

.005

.015

63

.03

1

DAIRYLAND
ELECTRICAL
INDUSTRIES, INC.

P.O. BOX 187
STOUGHTON,
WI 53589
608-877-9900
DAIRYLAND.COM

DESCRIPTION

SSD Outline Drawing - All Models with Optional Terminals

DOCUMENT #

100075

SCALE

1:2

REV

A

DRAWN:

DATE DRAWN

2015-04-08

JPW

SHEET:

DWG SIZE

1

OF

DATE APPROVAL

B

2015-04-10

1

DWG APPROVAL:

HNT