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Q: What is generally considered to be the maximum allowable supply voltage variation?
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What is maximum voltage for residential low voltage circuits?

The answer to this question depends entirely on where you live. All voltages quoted are 'nominal', or 'named', voltages and not the actual voltage as you would measure it with a voltmeter. National regulations stipulate how much these nominal voltages may vary.For example, in the UK, the nominal voltage is 230 V, and the allowable variation is between -6% and +10%. So, the maximum (actual) allowable voltage is 253 V.In some residences, e.g. Cyprus, a three-phase supply is common for residences, in which case the maximum nominal line-voltage is 400 V, with a nominal phase-voltageis 230 V.


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What is the allowable maximum heat of hydration of concrete?

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How is boiler spring loaded safety valve works?

when the pressure increases over the maximum allowable working pressure of the vessel, the valve will open to protect against overpressure.


What is the formula used to determine the maximum allowable amperage for a given circuit?

There is no single 'formula' for this, as the maximum current a circuit can handle depends on the temperature the various components within that circuit can operate at, without deterioration. There are so many factors involved, such as the type of component, the type of insulation, whether it can cool naturally or whether it must be force cooled, etc. Every circuit must be considered on an individual basis.