He has to use 65 amp fuse. Identify the smallest gauge wire the load current will flow through. Because the length of the cable run is relatively short at less than 10 feet, you’d be safe using a 16 gauge wire. I can’t find the actual fuse he needs. Determine the operating voltage of the power source. That table tells you that you should have no smaller than 21 gauge wire for your circuit. For a household circuit, a 15-amp fuse should be used in this circuit. The main function of a fuse is to protect your wiring, but in order to do so, you’ll have to get the right fuse wire size from the start, too low and it’ll blow, too high and you’ll end up doing damage to the whole circuit! He worked as a reporter and columnist in South Florida before becoming fascinated with computers. An undersized fuse will prevent adequate current reaching its destination. In the case of a 110-volt circuit, using 1200 watts, the calculation would be: 1200/110=10.9 amps. Things could get really ugly really quickly, so to avoid all that mess you’ll need to ensure that you get the right size fuse for the job every time. I have calculated the amps for the fuses so thats all o (i think) but is the 12 guage wire a problem. An oversized fuse can defeat its original purpose by allowing too much current to flow through a circuit. phone charging, small fridge. I just think it’s important that NO ONE thinks a fuse size is rated only for the loads it it supplying power to. Current is measured in Amperes, abbreviated to Amps or just the letter A. A 20-amp fuse could overload wiring designed for a load of 1200 watts on a 110-volt circuit. The cable run from the battery is approximately 15 feet. Size the fuse to its particular holder. Read common questions and answers on ATC Fuse for LEDs, I have a question what size fuse in my car car should I run with a 150 W LED high beam and low beam Just want to know what size I should be running to get the most out of my LED headlights whatever information you can give me that would be helpful thank you. Hemera Technologies/PhotoObjects.net/Getty Images. The Fuse Relay Holder has a Positive and Negative side. Use a calculator to divide the number of watts by the voltage. The fuse size should be based on the SMALLEST wire (largest gage number) in the circuit. I’m not sure if I agree 100% with the way that calculations are being done here. It’s best to install the fuse as close to your battery as reasonably possible. That means FIRST you determine what size WIRE you need based on the Length of the wire run to the 150 watt lights. Actually, the load of the circuit should have nothing to do with choosing a fuse size. Is that too much, too low, or about right? For one, a 12V battery isn’t always going to be at 12V. What size of wire and fuse should I use please? The " / " in the equation above represents the division symbol. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Determine the watts required by the circuit. Finn McCuhil is a freelance writer based in Northern Michigan. 2) Does the inline fuse go near the socket or the battery? See this guide to learn how to calculate load current. My question is How we check fuse rating ok, Like if our fuse is 40A and on the fuse have written 40A by manufacturer but how we check it is 40A I think may be that fuse 50 and 30 A so plese provide answer. So if you take the worse case low battery scenario (10V), then I think that you would actually get a 15A draw RMS. Amperage is determined by W/V, so if the wattage is 150 and you are running it on 12 volts, it is 150/12. Add the values and divide by 1000 to get your total current in Amps. Don’t worry if you’re lost, you’re at Oznium, we’re helpful here. A 10-amp fuse would "blow-out" consistently before the necessary power was delivered. I’m kinda rusty on my electronic principles but given P=VI > P=12 x 15 > 180W. Ive just had an electritian use 12 gauge wire on a 12v set up on a RV im building. Personally, I would go with the 20 gauge wire and a 2.5A fuse. Every electrical circuit will need a different amount of electrical current, what is just right for one electrical circuit may be too much or too little for another. but then your LEDs will draw a little higher when you first switch them on (Peak vs RMS), so if you multiply by (square root of 2 or ~ 1.41 rough estimate for peak) then you actually get about 17.1A… So if you’re blowing 15A fuses with a 150W LED setup, then I think it would be better to try a 20A fuse with wire and relay sizing to match. For electronic components, the fuse size SHOULD be matched to the working amperage as closely as possible without starving the circuit. Fill out our calculator at the top of the page and it will provide a recommended … He now builds wooden boats in the north woods. I am installing a 20 amp max marine waterproof 12VDC socket above my rear bumper for accessories such as a tire inflator (15 amps). Ex: 5A,10A,15A,20A. You can use this value in the fuse size chart above to determine the minimum wire size required. One common misconception about choosing the correct fuse size is that it’s dependent on the load of the circuit. 10AWG wire will be just perfect for your application. The12Volt.com: Recommended Power and Ground Cable Sizes. The following formula will give you size fuse you need. In a home, it is designed to prevent fires by shutting the power off in the event of short circuits or high voltage. Small glass … A 20-amp fuse could overload wiring designed for a load of 1200 watts on a 110-volt circuit. That is only one part of the considerations of properly fuse protecting a circuit. DO NOT EXCEED THE VALUES ON THIS TABLE! TIA for your quick reply.

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