Now lets say that your voltage drop is 10%. If your circuit needs 100 amps of current, the battery cable will absorb 24 watts of power because of it’s resistance. At the source, or battery, you will read 12 volts using a voltage meter, but at the other end of the cable your voltmeter will only read 11.76 volts (12 volts -2%). Why is voltage drop important? for example, let’s say that your length of battery cable is connected to a 12 volt source and has a voltage drop of 2%, which is considered adequate for almost all electrical systems. This voltage drop is influenced by the diameter of the copper conductors inside the cable, and the total length of the cable – The longer the battery cable is, the higher the voltage drop will be, and the larger the diameter, or gauge (AWG) of the battery cable, the less the voltage drop will be. Voltage drop is simply the voltage seen at one end of the cable minus the voltage seen at the other end of the cable. As electricity flows through a cable, there is an inherent resistance to the flow of that electricity which will generate heat in your battery cable and manifest itself in the form of what is called a voltage drop. When choosing the size of a battery cable to power your electrical system or project, it is important that it is sized appropriately. It is always a good idea to cover the terminated ends of your automotive wire with some heat shrink tubing. Basically, if you crimp your wire and terminal together, and you cannot pull them apart, the connection will most likely suffice. The key is to make sure that there is good electrical contact between the copper strands of the wire, and the barrel of the terminal or connector. However, in 95% and more cases, a good crimp will work just as well. Is it better to solder or to crimp connectors to automotive wire? Soldering is superior since it creates a maximum amount of surface contact between the wire and the terminal or connector. The voltage reading on your volt meter at the end of the wire will only be 9.6 volts, and the wire is absorbing a whopping 48 watts of power! Now let’s say your wire has a 20% voltage drop. If you are running 20 amps through your wire then your wire is absorbing 4.8 watts of power. So if you put a volt meter on your battery and read 12 volts, when you put your volt meter on the end of the wire, you will read 11.76 volts. That leaves 11.76 volts, or units of work left. If you’re wire has a 2% voltage drop, then the wire is using up 0.24 volts, or units of work. In its simplest terms, you can think of 12 Volts as during 12 units of work. This lost energy is realized in the form of a voltage drop at the end of the wire. Why is the size of an automotive wire so important? When electricity passes through a wire, The wire resists the electricity and some of it is converted into heat that is absorbed by the wire. Based on the chart above, you would want to use 12 gauge automotive wire for your floodlights. The length the wire needs to be to connect to the floodlights is 9 ft. For example, you want to add some flood lights to your vehicle. Just want an answer to a wiring question and people get bent out of shape lol.In order for your automotive electrical system to perform properly, your wire must be sized properly based on the amount of current (amperage) the wire must carry, and the length that the wire needs to be. Sime peoples answers have been very dramatic on here.
100 AMP WIRE SIZE CODE
I just figured it would be a simple question to have answered since that's what this sub is kind of here for, instead of having to track down a code book and do the research manually. People are quick to assume I am not capable of doing this with no knowledge of my experience whatsoever. I just wanted to double check with the people on this sub that it was going to be done correctly.
I am very capable of doing the job, I have been an HVAC service tech for many years and have worked on many electriacal components ranging from 24v-480v. You cannot edit the post after you submit it, so anyone that was going to offer help I was going to inform them on my typo. He suggested AWG 2 for both neutral and hot, and AWG 6 for the ground. 2" PVC Conduit running underground.Īlso I mistyped the info from my friend on accident on my post.
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