Without taking into account the wire length. Obviously, AWG 6 for 60 Amps current is simply a too thin wire that will overheat easily every time it is pushed to its limit - not a good choice. While some electricians may consider AWG 3 wire an overkill for a 60 Amps current, especially if the wires are not extra long, most will go for AWG 4 wire for 60 Amps current. If we check the wire chart, we should find a wire with an Ampacity value of 75 Amps or the next best thing:Īs one can see, different maximum temperatures also mean different wire sizes. So, for a 60 Amps wire, we will choose the wire size with the Ampacity of AT LEAST 75 Amps and the required temperature. For example, when calculating wire thickness for 60 Amps, we will look for the cable with the Ampacity of: Ampacity or "80% Rue": when calculating wire size, we will go for the wire that features an actual Ampacity 25% better than the Ampacity in the chart. Choosing a lower temperature adds an additional safety level. wire temperature: Wire thickness is very often calculated for temperatures of 167☏ (75☌), but 140☏ (60☌) is already a hot enough temperature to prevent an adult to hold the cable with an unprotected hand for more than a five-six seconds. When calculating wire thickness, there are a few rules that one must obey, including: When looking for the right wire thickness for the required current (60 Amps), first we have to find the proper wire thickness at the required wire surface temperatures as listed in the given chart. One can't have "too thick" wire for a certain current - thicker cables mean less energy losses, but also such wires are more expensive, more difficult to work with, and similar. Note: Ampacities are given for enclosed wires ambient temperatures.
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