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Additional info for Nec Handbook (National Electrical Code)
First, the use of a supplementary device is specifically limited to only a few applications. Second, where it is used, the supplementary device must be in addition to and be protected by the more robust branch circuit overcurrent protective device. Switch, Bypass Isolation. A manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch. 7(B) for further information on bypass isolation transfer switches.
1285-in. 1285 in. 25 circular mils or 16,510 circular mils (rounded off) According to Table 8 in Chapter 9, this rounded value represents the circular mil area for one conductor. Where stranded conductors are used, the circular mil area of each strand must be multiplied by the number of strands to determine the circular mil area of the conductor. 7 Insulation Integrity Completed wiring installations shall be free from short circuits and from grounds other than as required or permitted in Article 250.
4 Voltages Throughout this Code, the voltage considered shall be that at which the circuit operates. The voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected. 5. See the definitions of voltage (of a circuit); voltage, nominal; and voltage to ground in Article 100. 3(C), which specify the voltage limitations of conductors of circuits rated 600 volts, nominal, or less, and over 600 volts, nominal. 5 Conductors Conductors normally used to carry current shall be of copper unless otherwise provided in this Code.