two fuses on positive for accessory

[RollinEEZZ]

Greetings boaters

Garmin chartplotter comes with an inline fuse holder hardwired into the supplied power cable. Garmin states that cutting out this inline fuse holder will void product warranty.

We'd prefer to install the power cable into our watercrafts existing fuse block and use a blade type fuse and cut out the garmin inline fuse. We're not going to do this to preserve the product warranty.

Here's the question ... per ABYC marine electrical standards, are there any codes that prohibit installing electrical devices that are double fused on the positive side?

Thanks in advance

 

[MH Hawker]

nope its done all of the time for instance i have a 50 amp main line going a 14 circuit fuse panel to a 5 amp fuse feeding power to the 1 amp in line to my FF

 

[joeanna]

yep, been there done that also,

 

[bruceb58]

Garmin's inline fuse protects that device. Leave it in there.

 

[StingrayMike]

No, there are no ABYC codes that state that.
if you hook the unit to your fuse/breaker panel with the appropriate fuse/breaker that provides the same protection as the in line fuse, it will not be a problem.
if you have to send back a unit for repair they dont ask for the power cable as well to verify you are using their fuse. If at all, they ask what size you are using.

its not needed, but its up to you

 

[gm280]

If you really think about it, most boaters have a lot of double fused circuits on board. So there is zero issues doing that. I say that but if you use a too small panel fuse with the inline fuse, the panel fuse will blow and stop the voltage. So as long as you use the same size fuse as the factory inline fuse or even a larger size then the factory inline fuse for the panel fuse, it will work all day. Just don't use a smaller fuse for the panel fuse.

 

[StarTed]

Series fusing is not bad. Fuses are used for many reasons such as protecting wires, components, motors, etc. There are also all kinds of fuses. Time delay fuses may work better for motor starting. Regular fuses we use all the time can carry quite an overload for a short time. There are solid state fuses that will blow on 1/4 cycle which means on the rise of a 60 Hz sine wave. Boy are they fast.

We've tested fuses on a controlled current ramping it up slowly. It's amazing how long a regular fuse will hold in. It may take a few seconds for a 10 amp fuse to blow at 40 amps. That's not a problem for most applications.