Common in North America, this system uses numbers where a smaller number indicates a thicker wire . For example, a 10 AWG wire is much thicker and can carry more current than a 14 AWG wire.
Maximum recommended voltage drop (NEC 215.2(A)(1) Informational Note): electrical cable size
If the calculated voltage drop exceeds the allowable percentage (e.g., 3%), you must increase the cable size to the next available size, regardless of whether the thermal calculations allowed a smaller size. Common in North America, this system uses numbers
Standard tables assume a specific ambient temperature (usually 30°C for air). If the environment is hotter (e.g., a boiler room or a roof space in summer), the cable cannot carry as much current before hitting its thermal limit. Common in North America
Several factors need to be considered when selecting a cable size, including:
Common in North America, this system uses numbers where a smaller number indicates a thicker wire . For example, a 10 AWG wire is much thicker and can carry more current than a 14 AWG wire.
Maximum recommended voltage drop (NEC 215.2(A)(1) Informational Note):
If the calculated voltage drop exceeds the allowable percentage (e.g., 3%), you must increase the cable size to the next available size, regardless of whether the thermal calculations allowed a smaller size.
Standard tables assume a specific ambient temperature (usually 30°C for air). If the environment is hotter (e.g., a boiler room or a roof space in summer), the cable cannot carry as much current before hitting its thermal limit.
Several factors need to be considered when selecting a cable size, including: