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A common mistake in amateur calculations is assuming standard conditions.
| Factor | Symbol | Example Value | |--------|--------|----------------| | Ambient temp (Ca) | PVC 30掳C=1.0, 40掳C=0.87 | See table | | Grouping (Cg) | 1 circuit=1.0, 4 circuits=0.65 | See table | | Thermal insulation (Ci) | Fully surrounded=0.5 | BS 7671 Table 52.2 | | Soil thermal resistivity (Cs) | 1.2 for dry sand | Usually 1.0 |
Calculating cable size is not simply picking a wire that "fits." It is a mathematical proof of safety. The hierarchy of selection is:
The cable must be able to withstand the intense heat of a short circuit long enough for the circuit breaker to trip. This is often called the "Adiabatic equation."
Calculate Minimum Required Capacity ($I_t$): $$I_t = \frac260.94 \times 0.65 = \frac260.611 \approx 42.5 \text Amps$$
Cables must withstand short-circuit current without melting insulation.
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聽聽聽聽聽聽 觉得CCleaner清除能力不够强？那可以试试Comodo推出的Registry Cleaner，如果先用CCleaner清除一次，再用Comodo Registry Cleaner扫描一次，应该都可以多扫出几百个无效的注册表项目。而且可还以自定义清除的时程，并能移除开机自启动的程序，非常实用。 A common mistake in amateur calculations is assuming
更新日志：
Changes in COMODO Registry Cleaner 1.0.0.12:
* Fixed bug in life time free license activation;
* Fixed user reported crash, where outlook could crash after cleaning registry. This is often called the "Adiabatic equation
