Quote:
Originally Posted by Marineman
lol...Well, a fuse and a breaker are basically the same thing. Why don't we use a fuse and a breaker in our house electricity? Same with our cars? It's one or the other.
Now, you can fuse/breaker a specific appliance. My wife uses a hair dryer and the cord has a GFI on it in case it's dropped in water. But most electrical appliances, which includes vacuums, stereos, ovens, etc., they all rely on the breakers in your power grid to "Trip" in case too many amps are drawn on a circuit.
In my RV's situation, the fuse AND the breaker protect the hot lead going to the switch. So all of the 30 amp wiring coming from the point of power are the same, going directly to the 40 amp switch, which is then transmitted to the 30 amp motor. So in this case, the 30 amp auto reset breaker is pointless if there is a 15 amp fuse in front of it, because if the system becomes overloaded, that 15 amp fuse will blow before the breaker overheats.
And all of this is happening, front to back, in a 30 amp World (circuit).
The only reason I see the 15 amp fuse having a purpose is to blow when the slide is out of adjustment, as any motor under a load will draw more amps. And if that's the only reason, we should be told that.
I also just finished reading a post on another RV thread and the person was having trouble with blowing this fuse when the slide was fully retracted, or when it sealed up tight in the closed position (same thing happening to me), which is when the motor works the hardest. He replaced it with a bigger fuse, problem solved.
Now, it's on us if we ignore a bumpy slide. Me, I'll adjust mine if it gets bad. It's not hard to do.
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I understand electrical circuits lol..I work almost everyday elbow deep in high and low voltage ..but I will say that rv’s are perplexing to me. Boats I understand..
They have a higher standard of compliance..yacht certification/ABYC standards .usually not any surprises.
I will stop beating this to death lol I was trying to explain that on a production line they may have wiring harnesses premade and just adapt the end of the line and fuse differently depending on size of slide motor installed.. it was just a guess.
I will leave this to the experts but I would wager that all the same models are wired the same way unless it was just a one off mistake.
I go on air conditioner service calls where a 10 year old ac unit just starts randomly tripping the breaker.. the compressor is pulling more amps to start up because of internal breakdowns .. I check the original capacitor and add a hard start if necessary.. check the breaker to see if it’s hot or warm to touch Check to make sure all wire connections and screw terminals at breaker and contactor are tight..check voltage and refrigerant charge.
If it runs with the hard start I tell them it’s probably just a bandaid and might last a day a week or a year but the ac unit is on its downward spiral.
Electrical problems rarely happen randomly...it’s usually a cause and effect situation
BUT that being said I’m glad you reached a comfortable solution and you made me aware of extra fuses that may be lurking under my fifth wheel