![]() ![]() You can run a 0 AGW wire to supply some very small load (if you want to waste money). And it’s NOT about protecting the “device”. But it seems many fail to START OUT with the point of how important matching the fuse protection size to the calculated wire AGW size is. Yes wire AGW size needs to be increased if you are running long lengths to avoid voltage drop… All these things seem to be well addressed on many sites with their charts. Yes you need to consider total Amps that will be drawn by the load. It seems like a LOT of people miss the simple point that the MOST IMPORTANT consideration to any of these auto electric projects is insuring you match the proper size fuse for the AGW wire size you install. For 6 volt automotive systems typically a wire gauge 2 sizes larger than what is shown should be used. Using these two numbers, Amps and length, locate the nearest gauge value in the chart below. Then measure the distance that the wire will travel (length) including the length of the return to ground (the ground wire running to the chassis or back to a ground block or battery. To choose an adequate wire gauge, determine the amp draw (amperage) that the wire circuit will carry. But when choosing between two potential gauge sizes in the gray area of estimated gauge calculations or references, it’s always better to go with the larger gauge. Alternately using an oversized wire gauge does not have a downside and may provide better performance of the accessory, however, overkill in itself has the downside of wasted money and valuable space. Installing too small a wire gauge decreases performance and may create a potential safety hazard. ![]() A 3-foot wire length will have less resistance than a 20-foot wire and therefore a longer length of wire may require an increase in the wire gauge to provide adequate voltage to the accessory. For that reason, it is important to factor in the length of wire when determining the wire gauge. All wire has inherent resistance and the longer the wire, the greater the resistance and the greater the voltage drop over the length of wire. ![]() 13.8 volts is a better value to use for wire gauge calculations though it will generally result in about the same gauge as 12 volts. When the vehicle is running, the alternator will increase the automotive voltage up to about 13.8 volts. Older batteries will probably show a lower voltage. 6.4 volts for a 6-volt lead-acid battery. The actual resting voltage of a fully charged, 6-cell automotive lead acid battery is about 12.7 volts or about 2.1 volts per cell. More current draw (higher amperage) requires a larger wire gauge to safely power the accessory.Īutomotive wiring is not exactly 12 volt. To find the required wire gauge for a specific application, you must know the current draw of the accessory on the circuit and the total wire length between the accessory and the power source. The larger the wire, the smaller the gauge number. Wire uses the measurement of gauge to determine the size of the wire. *Data provided on this page is subject to change based on different manufacturers variances.12 Volt Wiring Gauge Requirements at specific Amps to length for Automotive Electrical Systems … Stranded, uncoated copper conductors per ASTM-B3, ASTM-B787 and ASTM-B8Ĭolor-coded Polyvinyl Chloride (PVC), heat and moisture-resistant, flame-retardant compound per UL-1063 and UL-8 6 AWG THHN/THWN-2 Specifications*: Size:ĥ5 Amps at 60✬ / 65 Amps at 75✬ / 75 Amps at 90✬ Solid, uncoated copper conductors per ASTM-B3 Institute of Electrical and Electronics Engineers All sizes are rated gasoline and oil-resistant II.Ī tough, polyamide, Nylon outer covering per UL-1063 and UL-83. Most common building wire used often on sub-panels, hot tubs & jacuzzis.Ĭopper wire, THWN-2 Wire, building wire, hook up wire, conduit wire, hot tub wire, lighting wire, nylon copper wire, construction cable, 6 gauge wire, etc. Applications requiring Type AWM conductor is appropriate for use at temperatures to not exceed 105☌ in dry locations. Applications requiring Type MTW conductor is appropriate for use in dry locations at 90☌, or not to exceed 60☌ in wet locations or where exposed to oils or coolants. Applications requiring Type THHN or THWN-2, the conductor is appropriate for use in wet or dry locations at temperatures not to exceed 90☌ or not to exceed 75☌ in oil or coolants. Please call for longer put ups.Ħ AWG THHN/THWN-2 building wire is intended for general purpose applications as defined by the National Electrical Code (NEC). 6 AWG THHN-THWN-2 is permitted for new construction or rewiring for 600-volt applications. Enter the desired footage in the QTY box. ![]()
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