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Primary Voltage - an overview | ScienceDirect Topics Willis, in Electricity Transmission, Distribution and Storage Systems, 2013. 1.5.5 The service transformers. Service transformers lower voltage from the primary voltage to the utilization or customer voltage, normally around 240–250 V in European systems and 120/240 V two-leg service in most power systems throughout North America. In overhead construction, service transformers are pole ...

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