Rustrol® Systems, DC-Decoupler
Model: DCD

Interprovincial/International Corrosion Control manufactures Rustrol® Systems for World Wide Distribution. The Rustrol® solid-state DC-Decoupler Model: DCD are an essential component for safely isolating cathodically protected structures (i.e. Pipelines, On-Grade or Buried Storage Tanks, etc.).

Rustrol® DC-Decoupler Model: DCD device is designed to protect personnel and equipment from electrical disturbances. The DC-Decoupler Model: DCD blocks DC current associated with cathodically protected structures, and provides an effective and continuous conductive path to the Utilities Grounding/Earthing Network for all other forms of Electrical Exposures, such as:

  • Lightning/Surge Currents
  • AC Fault Currents
  • AC Induced Voltages
  • Over-Voltage Protection.

The Rustrol® DC-Decoupler, Model: DCD enhances the Rustrol® Product Line by providing economical alternative for light/moderate (i.e. non-continuous) exposure of Lightning, AC Mitigation/Discharge and AC Fault Current.

The Rustrol® DC-Decoupler Model: DCD is a recent development to the Rustrol® Product Line. The DC-Decoupler‘s unique features are based on the proven Rustrol® technology utilizing solid-state design and superior test proven, quality components throughout the construction. The standard DCD Product Line provides an economical engineered solution in a compact, lightweight, ready to mount assembly.

The Rustrol® DC-Decoupler Model: DCD is innovative by design, whereby DC isolation is achieved and AC coupling is maintained, ensuring electrical grounding criteria remains effective.

The Rustrol® DC-Decoupler Model: DCD is capable of reducing the potential difference across isolating flange assemblies and/or monolithic isolating joints to well below the industry accepted criteria (i.e. <10 volts AC rms).

The Rustrol® DC-Decoupler Model: DCD is versatile and can be used in numerous applications, including coupling the primary structure (i.e. pipes, valves, pumps, etc.) in series through the DC-Decoupler to Gradient Control Systems.

The Rustrol® DC-Decoupler Model: DCD is typically utilized within:

  • Oil and Gas Transmission Pipelines
  • Refinery and Petrochemical Industries
  • Electrical Utilities
  • Tank Farm/Oil Depot Facilities.

The Rustrol® DC-Decoupler Model: DCD product advantages are:

  • Independent Product Certification – ATEX/IECEx
  • Rustrol®, an Industry Leader for Safe DC Isolation
  • Fail-Safe Design; Grounding Criteria Assured
  • Compact; Ready to Mount Design
  • Maintenance-Free Performance
  • Eliminate “Step and Touch” Potential Risk
  • Maintains coating Stress Voltages within Acceptable Limits
  • No additional Mounting Accessories required for Installation
  • No Structure Compromise Required for Installation (i.e. Flange Drilling)

The Rustrol® DC-Decoupler Model: DCD is available in common models with rated AC Fault Current exposure parameters. DC Voltage Thresholds and other Operating Parameters are to be specified by the “End-User”, please review the Selection Guide within the DC-Decoupler Brochure.

Rustrol® Systems are manufactured in accordance with ICCC’s Quality Assurance Program, based on product “type” testing by an Independent Test Facility, all products are CE Listed.

Rustrol® DC-Decoupler
Model: DCD ( Announcement)

Independent listings with the European Community, the ATEX Directive and CE, provides the assurance to ‘End-Users’ of the required performance and reliability of the Rustrol® DC-Decoupler Model: DCD. To the best of our knowledge Rustrol® is the only industry related product to meet this high standard of ATEX specified criteria (i.e. Gas and Dust Hazardous Areas).

The Rustrol® DC-Decoupler Model: DCD recently achieved IECEx Certification, and is the only DC Decoupling Device to be certified under both the IECEx Scheme and the ATEX European Directive 94/9/EC, for intended use in Gas and Dust Explosive Atmospheres and bears the following Marking:


Ex ec IIC T6 Gc
Ex tc IIIC T80°C Dc IP6X (-40°C ≤ Ta ≤+60°C)

The Rustrol® DC-Decoupler, Model: DCD-ATEX complies with the following standards:

  • EN 60079-0:2012+A11:2013, Explosive atmospheres. Equipment. General requirements
  • EN 60079-15:2010, Explosive atmospheres. Equipment protection by type of protection “n”
  • EN 60079-31:2014, Explosive atmospheres. Equipment dust ignition protection by enclosure “t”

The IECEx Certificate of the Rustrol® DC-Decoupler Model: DCD is accepted by Certification Bodies in thirty-six (36) IECEx member countries including the European Community, Australia, Brazil, Canada, China, India, Japan, Korea, Russia, United Kingdom, USA, and many other leading countries.

Rustrol® DC-Decoupler
Model: DCD-ATEX ( Announcement)

The Rustrol® DC-Decoupler Model: DCD-ATEX is bearing the cQPSus Listed Mark for use in Hazardous (Classified) Locations:

  • Class I, Division 2, Groups A, B, C, and D,
  • Class II, Division 2, Groups F and G

The cQPSus Mark indicates the Rustrol® DC-Decoupler Model: DCD-ATEX has been independently tested by a “Third-Party”, and it has met the requirements of accepted product safety standards.

The Rustrol® DC-Decoupler Model: DCD-ATEX complies with the following UL, CSA, ANSI and ISA standards:


  • CAN/CSA-C22.2 No. 60079-0:2011
  • CAN/CSA-C22.2 No. 60079-15:2012
  • CAN/CSA-C22.2 No. 60079-31:2012
  • CAN/CSA-C22.2 No. 213-15

United States of America

  • UL 60079-0:2013 Ed. 6
  • UL 60079-15:2013 Ed. 4
  • UL 60079-31:2015 Ed. 2
  • ANSI/ISA-12.12.01-2015

The Rustrol® DC-Decoupler Model: DCD-ATEX is superior to all other Decoupling Devices since it has been certified for use in Hazardous Location in compliance with the latest North American Safety Standards.

The cQPSus Listed Mark was approved by QPS Evaluation Services Inc., which is designated as a Nationally Recognized Testing Laboratory (NRTL) by Occupational Safety & Health Administration (OSHA) of USA; in addition, QPS is accredited as a Testing Organization and Certification Body by the Standards Council of Canada.

The Rustrol® Cathodic Isolator®, Model: DCD is certified and has the most extensive range of protection for a DC Decoupler available within the Marketplace, manufactured to the most current ATEX (European),
IECEx (International)KCS (Korean) and QPS (North America) Certifications., exceeding “all” competitors certifications worldwide.

Rustrol® DC-Decoupler
( Korea Safety Certification)

The Rustrol® DC-Decoupler Model: DCD-ATEX achieved the KCs Mark (Korea Safety Certification).

The Korea Safety Certification Scheme is a mandatory certification that requires products to be certified by a Korean Certification Body; the certification process conforms to Korean Industrial Safety and Health Act.

The KCs Certification is issued by a Korean Certification Body, which is accredited by Korea Standards Association (KSA).


Cable Terminations:

The Rustrol® DC-Decoupler Model: DCD is typically provided with a Standard Flange Mount Assembly (FMA):

  • Flange Mount Assembly (FMA), consisting of one (1) cable 300 mm (12”) length of AWG #6 (equivalent to 16 mm2), multi-strand connecting cable with high temperature black insulation and one (1) Rustrol®
    External Flange Mount Bracket to accommodate for up to M30 (1”) dia. Bolt. Example of Cable Termination Order Code: DCD-02.5-SL-0202-ATEX-FMA (Typical Photograph)
  • Optional Terminal (OT), similar to Flange Mount Assembly (FMA) with 90° turn of the Mounting Terminal Post. (Typical Photograph)
  • Dual Terminal (DT), two (2) “External” Terminal Posts with 1 Bolt Pattern, complete with 3/8″ – 16 UNC x 1″ Stainless Steel Hex Head Bolt, Washer, Lock Washer and Nut. (Typical Photograph)
  • Internal Terminal (IT), two (2) Internal Terminal Pads, complete with aluminum termination lugs. The Internal Terminals provide additional safety features, especially for Hazardous Locations that contain Conductive Dust (i.e. Ex tc IIIC T60°C Dc (-20°C ≤ Ta ≤+50°C)) (Typical Photograph)

Please review ICCC’s Drawing No. DCD-04, Rev. 0 for Cable Termination Options.

Free-Standing Fibreglass Pedestal Mount:
The Rustrol® Cathodic lsolator® Fibreglass Pedestal, Model: CIFP-36 provides a secure, maintenance-free secondary enclosure for mounting the Rustrol® Cathodic lsolator®, Model: Cl, SSP or DCD (i.e. DC Decoupling Device).

Please visit the webpage of Rustrol® Cathodic lsolator® Fibreglass Pedestal, Model: CIFP-36, for Typical lnstallation and additional information.

And these are just a few typical applications for the Rustrol® DC-Decoupler. Other possibilities are limited only by one’s imagination. Contact us today to speak with our experts or to request more information.

Demand the Best, Specify Rustrol®!