Published at Tuesday, March 26th, 2019 - 08:31:33 AM. wiring. By Natuche Adam.
In the April 10 issue of The News, several readers noted that some of the wiring diagrams accompanying the article on “Electricity 101” were flawed. We salute their sharp eyes, and hope their letters help clear up any confusion this seemingly basic article may have caused. From a reader at Tringale Electric, Lexington, MA: “Concerning the diagrams, Figure 2 needs to be corrected in both A and B voltage drops due to the fact that the light, if it is a light, could not be arrived at these voltage drops. Assuming this is a light, I therefore question the values of the voltage in both diagrams. The only way these values could be arrived at would be to replace the light as shown with a single-pole switch. “
For example, let’s say the red probe of the voltmeter is initially connected before the CR contact to read line voltage, which is 115 V in this example. If the CR contact is electrically closed when the red probe is placed after the CR contact, the voltmeter should again read 115 volts. If the voltmeter reads 0 V, the CR contact is electrically open. This process can be repeated for all of the switches in the circuit. Again if line voltage is read before a switch and after the switch, the switch is electrically closed.
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