Many quote the single-phase LV nominal a.c. mains voltage incorrectly e.g U.S. as 11oV whereas it is commonly 120V and has been for some time. It is common practice to use a voltage - dropping device with old guitar amplifiers to keep their B+ at the correct level.
This proscribed voltage can vary due to proximity to the feeder substation and to loading on the lines. Allowable variation is regulated in many counties.
For example, Australia: https://www.ausgrid.com.au/-/media/Files/Network/Documents/NS-and-NUS/NS238.pdf - see 6.1.1.1. Overall summary on page 3.
This proscribed voltage can vary due to proximity to the feeder substation and to loading on the lines. Allowable variation is regulated in many counties.
For example, Australia: https://www.ausgrid.com.au/-/media/Files/Network/Documents/NS-and-NUS/NS238.pdf - see 6.1.1.1. Overall summary on page 3.
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