Ifyou want to use those 20 amps 100 feet away, you need to increase the minimum ampacity the wire can handle by 20%. Here is how you calculate the ampacity now: 20 Amp Wire (100 ft away) = 25A × 1.2 = 30A Ampacity. That means that the #12 AWG wire with 25A ampacity won’t be enough any more.
Fromthe above table, if we apply the 83% rule, then the minimum required conductor size must be calculated for 83% of 100 Amps i.e., 83 Amps. So, the 100 Amp Wire Size with an 83% rule is AWG 4 for Copper Conductors and AWG 2 for both Aluminum and Copper-Clad Aluminum Conductors. Apart from the Service Entrance conductors, Thoughthe instructions do not apparently state the circuit breaker size, and the table for wire size does say a 13-amp load should have a 1.5 sq mm wire size (a little less than 14 gauge) point 1 says electrical code should be followed. NEC requires circuits feeding long-term heavy-draw devices to be de-rated 80%: Ris the resistance of the length of wire. If you have 15 feet of 4g power wire and your amplifier will draw 150 amps max Voltage Drop = current flow * (length of wire in feet * resistance per foot) Voltage Drop = 150 * (15*.00025) Voltage Drop = 150 *.00375 ohms Voltage Drop = .563 volts at 150 amps of current Calculating Wire Diameter and Tableof Contents. What Wire Size For A 15 Amp Circuit? What Makes 12 And 14-Gauge Wires Different? How Far Can You Go When Using A 12 Gauge Wire AMPSUPERSEAL 1.5 Series Connectors Technical Features 1.5 mm Tab Contacts Contact Finish: Tin plated, gold plated Current Carrying Capacity: 14 A max. Wire Size Range: 0.35 – 2.5 mm2 Extraction Tool: Part No. 9-1 Product Specification: 108-20090 Application Specification: 114-20045 1.5 mm Tab Contacts Wire Size Range InNew Zealand, for a 15-amp circuit, the wire must have a cross-sectional area of at least 1.5mm2. This wire size is known as 16 AWG, which is the standard size for most domestic wiring. It’s important to use the correct wire size to ensure that the current doesn’t overload the circuit and cause a fire or other damage. First you need to calculate the safe load. Remember that amp circuit breaker should be at least 125% of the load. Thus, in this case, the best breaker size = 10A X 125%= 12.5A. Note: the available breaker size ranges include 15A, 20A, 30A, 40A, 50A, etc. Therefore, in our case, a breaker size of 15A is perfect. .