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2 Wire Service Limited:
Single phase, 2 wire, 120 Volt service is available only for limited loads of approximately 3000 Watts or less which are served through a single 30 Ampere branch circuit, such as traffic signals, small signs, and cable television amplifier installations.
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Residential Service at 120/208 Volts:
In areas where the secondary distribution system is 208Y Volts, three phase, 4 wire (grounded neutral), residential buildings with one or two dwelling units are served through a single phase, 3 wire, 120/208 Volt common service.
Residential buildings with three or more dwelling units are served through a three phase, 4 wire, common service and the individual single phase, 3 wire, 120/208 Volt sub-services to the individual dwelling units shall be balanced as nearly as possible on the three phases.
All services, other than residential, are served through three phase, 4 wire services except small establishments with limited loads requiring a service of 100 Ampere or less capacity. They may be served through a single phase, 3 wire service.
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Single Phase, 3 Wire Service:
Single phase, 3 wire (grounded neutral) service is generally available for residential and general light and power service.
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Three Phase, 4 Wire, 240 Volt, Delta Service:
Three phase, 4 wire (grounded neutral), 240 Volt delta connected service is only allowed by special permission where two phase distribution is available. If three phase distribution is available, wye connected service must be taken.
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Three Phase, 3 Wire, 480 Volt, Delta Service:
Three phase, 3 wire, 480 Volt delta connected service is only allowed by special permission where two phase distribution is available. If three phase distribution is available, wye connected service must be taken.
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Three Phase, 4 Wire, 480Y Volt Service:
Three phase, 4 wire, 480Y Volt service is provided for commercial and industrial services when 12 KV service is available.
The maximum transformer bank on a single pole cluster mounted overhead installation is limited to a capacity of 500 KVA.
See Rule 9 for details and specifications for installation of distribution type transformers in a vault or a pad mount three phase transformer.
PPL EU can provide single phase, 3 wire service at 277/480 Volt for special applications, such as street lighting, highway lighting and special electric heating equipment.
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Single Phase, 3 Wire, 240/480 Volt Service:
PPL EU can provide single phase, 3 wire service at 240/480 Volts for special applications, such as street lighting, highway lighting and special electric heating equipment at the customer's expense. (C)