Chalo said:
Ampacity is determined not by insulation, but by conductor cross-sectional area.
https://www.powerstream.com/Wire_Size.htm
That chart is trash and you are wrong.
That chart uses NEC, 700, circMils/Amp, and we can easily get away with much less inour (EV) builds for we do not need to subscribe to insurance regulations ( like 700CircMil/Amp) for our bike is not being insured.... and u can use like 25o (CircMilsPerAmp) ballpark.
That chart is trash...; for people who worry about insurance regulations: ( like Helmet laws for motorbikes, but not for bicycles, one is insured and expensive, there is DATA on it, is required by LAW, one is NO DATA and noone cares, not required by LAW cause noone does expensive damage ) ( Like burn a home down or kill someone, expensive) Chalo... ) . Most online charts are trash.
The ampacity of a Cu conductor depends on the temperature rating of the insulation.
The effect of resistance to current flow is heating and this is dependent upon the size of the conductor, the insulation material around the conductor, and the installation environment. ... Similarly, the higher the temperature resistance of the insulating material, the higher the ampacity or current carrying capacity.
Cable ampacity of a single conductor is calculated based on the size of the electrified conductor, the established ambient temperature and the temperature rating of the insulation and jacket compounds. An increase in temperature rating of the compounds and/or an increase in conductor size will increase cable ampacity.
Ampacity is defined as the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. The ampacity of a conductor depends on its ability to dissipate heat without damage to the conductor or its insulation. This is a function of the insulation temperature rating, the electrical resistance of the conductor material, the ambient temperature, and the ability of the insulated conductor to dissipate heat to the surrounds.
For 50A, 10g is fine, 8 Ga is better, but you could get away with 12g auuge. On our little bikes.
I
n many instances, a circuit’s unique application correction factors (as described above) will warrant the need for ampacity adjustments. There are four conditions that will determine whether a correction factor is required:
1) Ambient temperature – The temperature rating of a wire must include the ambient temperature in the application. If the temperature rating of a wire is 90°C and it needs to be placed in a 75°C ambient condition, then the allowable temperature rise of the wire is 15°C (90°C minus 75°C). In this example, the Ampacity of the conductor size specified will need to be de-rated by 50% (based on being limited to a 15°C rise instead of a 30°C rise).
2) Duty cycle – many times the level of current in applications will vary over time depending on the type of loads. Electrical motors, for example, draw a large amount of current at start up for a short period of time and then the current level reduces as the motor reaches the steady state rpm. In these cases, the wire size is selected such that the temperature rise of the wire does not exceed 30°C.
3) Overall system requirements – Consider the load and maximum temperature rating of the devices and equipment that make up the electrical system. Sometimes they can be the limiting factor and not the wire. In other cases, the equipment can generate its own heat which will require a higher temperature rating for the wire.
4) Effect of adjacent load carrying conductors / rate of heat dissipation – More than three current carrying conductors (ground wires are not considered current carrying for these calculations) in a cable or conduit or enclosure affects the ampacity of the wiring as described above. In some cases, multiple wiring systems that generate heat are placed together in a common enclosure that impedes the ability of the wiring to dissipate its own internally generated heat which causes additional temperature rise. This condition also requires that each circuit be evaluated to confirm that the maximum 30°C temperature rise is not exceeded.