Ask Experts Questions for FREE Help !
Ask
    Erik Fortrus's Avatar
    Erik Fortrus Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Dec 16, 2012, 02:05 PM
    110/24v transformer blow fuse after a couple hours
    I have this transformer for the ceiling lights (about 7) on my boat and start blowing the 10amp fuse on the 24v side. I changed the transformer, checked all the connections at every fixture, I tried to switch the transformer to the other side lights and the problem switched side as well.
    Could it be the fuse holder that has bad contact? What else could it be?
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #2

    Dec 16, 2012, 04:34 PM
    Sounds like an overload... what is the wattage of the seven fixtures you have connected?
    Erik Fortrus's Avatar
    Erik Fortrus Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Dec 16, 2012, 05:22 PM
    Quote Originally Posted by hfcarson View Post
    sounds like an overload....what is the wattage of the seven fixtures you have connected?
    Those are 20watts. I do have 2sets like that, one transformer for each side of the walkway ceiling. After switching them one side to the other, its still the same transformer that blow the fuse. No problem at all with the other one.
    Erik Fortrus's Avatar
    Erik Fortrus Posts: 4, Reputation: 1
    New Member
    		  
    #4

    Dec 16, 2012, 05:25 PM
    Quote Originally Posted by Erik Fortrus View Post
    Those are 20watts. I do have 2sets like that, one transformer for each side of the walkway ceiling. After switching them one side to the other, its still the same transformer that blow the fuse. No problem at all with the other one.
    Its actually 110/12v transformer
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
    Ultra Member
    		  
    #5

    Dec 17, 2012, 05:05 AM
    So you have seven fixtures at 20 watts each on a 12 Volt, 10 amp fuse..
    7 x 20 = 140 watts... 140 watts / 12 = 11.6 amperes...
    The math says that you have too much load on that circuit...
    What size and type of conductors are installed? If the conductors are large enough then
    a 12 amp fuse may solve your problem.
    Erik Fortrus's Avatar
    Erik Fortrus Posts: 4, Reputation: 1
    New Member
    		  
    #6

    Dec 19, 2012, 11:42 AM
    Its 12gage and not sure of the type of wire. I changed the fuse holder for a better quality one and found a bit of wire that was 14 gage so switched with 12 gage and installed. 15 amps fuse. Seems to be holding fine now, will see in a couple hours.
    Thanks for the tips, hopefully it will stay on this time.
    Quote Originally Posted by hfcarson View Post
    So you have seven fixtures at 20 watts each on a 12 Volt, 10 amp fuse....?
    7 x 20 = 140 watts.....140 watts / 12 = 11.6 amperes....
    The math says that you have too much load on that circuit...
    What size and type of conductors are installed? If the conductors are large enough then
    a 12 amp fuse may solve your problem.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

24v Transformer [ 4 Answers ]

I am trying to find a good source for a 24v transformer. I am working on a project that will use a digital home thermostat to control a couple of 24v relays. I've found all of the parts but a suitable, cheap, 24v thransformer. I thought this would be the easiest part to find but it is turning...

24v transformer [ 4 Answers ]

How do I wire up a 24v transformer in a furnace for thermostat? What does 24v & 24vA connect to? I have a problem of fusses blowing when I turn on the furnace.:confused: How does heating transformer work?

24v transformer [ 2 Answers ]

Need wiring diagram to wire in 24v transformer I have gas furnace and a regular condensing unit not a heat pump. Fan relay side is 120 v . Had old style fan relay which is no longer available was sold new trans with plug in fan relay. Wall thermo cycles condensing unit but blower fan in furnace...

Turning on AC blows control board fuse and 24v transformer [ 15 Answers ]

I read https://www.askmehelpdesk.com/heating-air-conditioning/c-keeps-blowing-fuse-95884.html which was very informative. My issue is with a Carrier Weathermaster 8000 furnace and York AC. The heat works fine, the fan only works fine, I turn on the AC and the LED blinks code 34. I replace the...

24v transformer burns up [ 5 Answers ]

I replaced the 240vac to 24vac transformer with exact replacement part on my luxaire air handler.. I checked 24vac on transformer before I connected to control card and it was good.. I connected leads to control board and after about 30seconds the transformer burnt up again. The primary coils...

View more questions Search