DEI Isolators are typically applied using an industry standard method of matching the device to the steady-state current rating of the shore power service. DEI Isolators are offered in 30A, 50/60A, 100A and 200A ratings. For dual 30A services, one 50/60A DEI Galvanic Isolator can be used in place of two 30A units.

What does the term "fail-safe" mean?

To be considered "fail-safe," an independent laboratory must confirm that the isolator will either remain fully functional or remain a permanent, effective grounding path if it fails when subject to the maximum current capability of the grounding conductor for a given galvanic isolator current rating. This provides guaranteed safety grounding, even when the product is failed, thus the "fail-safe" designation.

What is the difference between Fail-Safe Plus and Fail-Safe MAX?

All DEI Galvanic Isolators are categorized as either Fail-Safe Plus® (FSP) or Fail-Safe Max® (FSM). Fail-Safe Plus models not only meet the fail-safe test criteria in the proposed revision to A-28, but also have considerably higher fault current ratings than are required and have substantial lightning current ratings, which are not required by A-28; hence, the "Plus" designation unique to DEI.

Fail-Safe Max models provide even higher AC fault current ratings than Fail-Safe Plus models and will still be functional and meet all other requirements of A-28 after being subject to the fail-safe test criteria, thereby providing the ultimate in performance and safety grounding; hence, the "Max" designation.

Do DEI products meet ABYC A-28 standards for Galvanic Isolators?

In the marine industry, the criteria for galvanic isolators is defined by the American Boat and Yacht Council (ABYC) recommended standard A-28, which has recently been revised. Due to recommendations to the A-28 galvanic isolator standards committee concerning the need to retain safety grounding under all conditions, as required by the U.S. National Electrical Code for all similar applications outside of A-28, the new revision of this standard now makes provision for fail-safe galvanic isolators, which guarantees the isolator will never compromise the ground. DEI Galvanic Isolators have been tested to meet or exceed all requirements of the revised ABYC A-28 for fail-safe galvanic isolators and were certified by Imanna laboratory.

Do DEI Galvanic Isolators need a monitoring system?

No. According to the revised ABYC A-28, any isolator meeting the fail-safe criteria will not require a monitor. Isolators not meeting the fail-safe requirement in the revised ABYC A-28 will still require a monitor. Since DEI Galvanic Isolators are tested to meet and exceed all ABYC A-28 standards, monitoring is not required.

How can I purchase DEI products?

DEI products are available for purchase from Farwest Corrosion Control Company,  America's leading distributor of corrosion control products.