Posted by 36 coupe on December 09, 2010 at 06:08:35 from (216.220.250.230):
In Reply to: Re: Hogwash posted by jdemaris on December 08, 2010 at 18:03:12:
Battery chargers do not have a line fuse .I have added a 5 amp line to my chargers.I use them outdoors.I have seen flames coming out off the top of a small battery charger.I have done fire reports where a battery charger started the fire.A battery charger started a fire in the town of Morril that burned 3 houses flat.A fellow lost 2 tractors and a truck to a Harley Davidson battery maintainer.That was on the Ford Barn sitealso one poster found a battery charger burned to a crisp beside his car.He had left it on the ground so the car didnt go with it.I have seen cordless phone chargers melted.Power tool chargers have started many fires.I know a fellow who left home one morning and remembered he had left a power tool battery charger on in his barn shop,went back and found the charger on fire.My son in law law always had a couple of power tool chargers runnig in his dining room.I warned him about the fire hazard.He didnt listen.Later I saw 2 bad burns on the hard wood floor.Asked my grandson about it.He said you were right Grampa.I know these small chargers can catch fire,You dont so dont tell me they are safe.Lets see if I can explain what happens when lightning strikes the power lines.There are 2 dodes in most chargers.Lightning strike shorts the diodes.Transformer is now working into a dead short.No line fuse.A 20 amp protected ac line will keep feeding power so the transformer will burn.Chargers that have a cicuit breaker in the DC side wont open as they only open on reversed polarity.AC DC welders have had their diodes shorted by lightning went left plugged in.Lightning jumps on off switches with ease.When summer lightning storms came in the TV service calls took off.Shorted diodes and scrs are common in fence chargers.Ive seen many transformers burned to a crisp when half wit owners replaced 1 amp fuses with 30 amp fuses.The metal case prevented a fire.Ive found pieces of drill rod and copper wire in fuse holders.I have been in electronics since the early 50s.I repair battery chargers and welders so I know far more about them than you do.A good 14 volt center tapped trans former at 3 amps will cost me 12 to 14 bucks.If you trust china electronics you will have a fire.Right now power tool chargers are #1 in starting fires.I answered fire call where a car was burning with a battery charger connected to it.Lightning happens every month of the year.a boy was killed in January while sliding by a lightning strike near here.A customer called me on Jan 1 last year, said he saw lightning strike his fence.When I opened the case the transformer was shredded.Friend saw smoke comming from a 6 amp charger he had put on his tractor.I asked if he had connected wrong polarity.He said meter read 3 amps when he left it.I found 1 shorted diode and an open fuse that is imbedded in the transformer winding.Cost for the transformer is high but the 13 buck ship charge makes the charger scrap.What you dont know can hurt you.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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