Nominal voltage 1

[PeteOh]

I understand that nominal voltage means that it can vary depending on system, supply source etc. My question is why is there such a variation in THE stated nominal voltage ? In other words, why does one appliance say 110 volts and another reference say 115, and another say 120 in another thread mentioned 125 ? What is the history or reason here ?
Thanks
Pete

 

[busbar]

For the US, there are ~35 Nominal System Voltages, where each has generally six limits, termed Maximum Utilization and Service Voltage (two ranges) / Minimum Service Voltage (two ranges) / Minimum Utilization Voltage (two ranges)/

Suggest obtaining the standard and reviewing the entire text—including the document Foreword for historical evolution. There are a lot of details, making it difficult and impractical to adequately explain here.

 

[busbar]

Aside—Its title is ANSI Standard C84.1-1995 [reaffirmed 2001] ELECTRIC POWER SYSTEMS AND EQUIPMENT - VOLTAGE RATINGS (60 Hz) and available through sites like ANSI.org or global.ihs.com. {It is not an IEEE publication}

 

[PeteOh]

Thanks Mr Busbar,
That standard had everything I needed. Thanks for the quick responce too.
Pete