Marina Guard® Alarm trip point may be set from .010 A. to 10 A.  As faults are located and repaired alarm levels may be reduced accordingly.

Feeder insulation resistance in ungrounded systems may also be monitored.
 
Power for the unit (120 VAC) is obtained from the substation and a wireless alarm signal may be sent to the dock master's office with an optional transmitter.

While an AC Ground fault may be a fire hazard at any time, faults in a fresh water marina, combined with inadequate grounding, are lethal to anyone in the water near the boat, and have caused a number of fatalities. This is also true if the fault is in the marina dock wiring.

Ground fault monitoring is now recommended in the Marina Electrical Safety Standard NFPA-303-2006, request excerpt.

Ground Fault Articles -
Incident List - Specifications

The documents listed below provide a more in-depth discussion of Marina AC Ground fault problems and describe the importance of the safety bonding system (green grounding conductor) and how it is involved in virtually all electrical accidents.

Just click on the link or email a request to us:

1. "The Critical Ground System," James D. Shafer,  Marina World, May/June 2004. Issue 31.  Explains the importance of marina bonding system and what part in plays in Galvanic / DC stray current corrosion and protection from AC ground faults. Marina Guard® application explained. (email request)

2. "The Case of the Hot Marina," Jim Shafer, EC&M, April 2004, Vol. 103 Issue #4, Click here for article. A gut wrenching true story of the electric shock drowning of a mother and daughter. A classic example of the harm done by an undected AC ground fault in fresh water, combined with a missing ground conductor.

3. "Hot Marina Lethal AC Ground Faults," Jim Shafer, Mike Holt News Letter, Nov. 17, 2003 Click here for article. A true story of the electric shock drowning of a rescuer just after he saved a young girl from the same fate. Another classic case, freshwater, ground fault, missing ground conductor.

4. "The Critical Element," James D. Shafer, Marina Dock Age, July/August 2006. Another look at the importance of the boat and marina grounding system. (email request)

5. "Electric Shock Drowning Incidents - Marinas," Jim Shafer, August 2007 Revision. Includes brief discussion of the cause of electric shock drowning. Why fatalities are not classified as electrocutions. Data based on news reports, police investigations, and third party accounts. Not a complete listing - as explained. (email request)

6. "Marina Electrical Safety Seminar" - one page brochure. (email request)

7. "Marina Guard® Specifications" Technical Parameters.  (email request)

8. Marina Guard® brochure (email request)

9. Procedure for using clamp-on meter (email request)
For more information on AC ground fault monitoring and our 15-page booklet, E-mail - Jim Shafer, Harbor Marine Consultants, Inc. at kp2r@bellsouth.net or call 772-284-0855.