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Peter Kennedy has been in  business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and  do-it-yourself boat owners who wish to undertake this work themselves.
Peter Kennedy has been in  business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and  do-it-yourself boat owners who wish to undertake this work themselves.

Sourcing High Voltage DC Equipment

Posted by Peter Kennedy on 7/13/2018 to Circuit Protection
I get asked all the time about high voltage DC applications.  Most equipment we sell at PKYS tops out at 48 Volts DC rating, only a few items are rated higher, and quite a lot have lower ratings.  Finding equipment for high voltage applications is not that easy.  

A comparison of ANL and MEGA fuses

Posted by Peter Kennedy on 6/19/2015 to Circuit Protection
ANL and MEGA fuses are similar high amperage DC fuses but there are some big differences. Here is a comparison.....

Circuit Breakers vs Fuses

Posted by Peter Kennedy on 1/13/2014 to Circuit Protection

Circuit Breakers vs Fuses, the Presidential Debate. Who to vote for? This short article will look at this debate in the context of two very similar switch panels by Blue Sea Systems. The Blue Sea Systems 4306 WeatherDeck switch panel with fuses is almost identical to the 4376 switch panel with circuit breakers. Which should you choose?


An explanation of the interrupt rating for circuit breakers and fuses

Posted by Peter Kennedy on 1/9/2014 to Circuit Protection
In extreme cases a fuse carrying an excessively high current can vaporize and the metal can be deposited on the base of the fuse block in a way that permits it to continue to carry current. Similarly with circuit breakers, if the level of fault current goes above a certain level the circuit breaker can become inoperable while still conducting current. Fuses and circuit breakers all have an interrupt rating which is a measure of the current that a circuit breaker can safely disconnect in the event of a fault. The interrupt rating may be different for AC and DC and may vary at different voltages..........

Overcurrent Protection

Posted by Peter Kennedy on 11/5/2013 to Circuit Protection
ABYC Standard 11.10 OVERCURRENT PROTECTION is a key section of the standards. The principal is very clear, an overcurrent device, such as a fuse or circuit breaker, needs to be placed within seven inches of where the conductor is connected to the source of power. The overcurrent device is protecting THE WIRE from carrying more current than it is able. What follows is an outline of this part of the standard but please see the disclaimer at the end.