Electric Standards


General Standards

ER Number Electric Standard
ER 4-200-D Distributed Resource Generation, Net Metered
ER 4-250-B Distributed Resource Generation, Feed-In Tariff, Single Phase
ER 4-300-D Distributed Resource Generation, Feed-In Tariff, Three Phase
ER 5-500-D Entrance Equipment
ER 5-550-C Entrance Run
ER 6-100-B Facility Modifications, General
ER 7-500-E Grounding
ER 13-260 Meter-Shut Off & Removal
ER 13-280 Meter Socket - Transformer Rated Application
ER 13-500 Motors - General
ER 13-510 Motors - Auxiliaries
ER 13-560 Motors - Starting Current
ER 16-600-C Power Quality, Customer Electric
ER 18-700 Rural Farm Service
ER 19-900 Standard of Work
ER 19-925 Substation-Maintenance, Customer Owned
ER 22-200 Voltage Drop
ER 22-500-C Voltage-Service, Availability



Service Install and Meter Equipment Approval

ER Number Electric Standard
ER 3-100-C Cabinet – Current Transformer 400 A. Max.
ER 3-110-C Cabinet – Current Transformer, 240 V., 800 A. Max.
ER 3-120-D Cabinet – Instrument Transformer, 480 V., 400 A. Max.
ER 3-130-D Cabinet – Instrument Transformer, 480 V., 800 A. Max.
ER 3-140-F Cabinet – Instrument Transformer, 480 V, 1200, 1600 & 2000A
ER 3-150-B Cabinet – Instrument Transformer, 480V-400 A Max.. 1PH
ER 13-210-C Meter-Installation, Pad Mount Transformer
ER 13-230-E Meter Location
ER 19-150 Service-Electric Plug In Vehicle, Sub Meter Socket Installation 
ER 19-210-G Service Entrance – CATV, 1PH, 2 Wire, 120 Volts
ER 19-220-H Service Entrance – GROUP, 7 or More Positions, Socket Breaker, Combination
ER 19-225-H Service Entrance – GROUP, Multiple Position, Socket Breaker, Combination
ER 19-230-I Service Entrance – GROUP, Horizontally Ganged, 2-6 Position
ER 19-235-I Service Entrance – GROUP, 2-6 Position, Socket, Breaker Combination
ER 19-236-D Service Entrance – Indoor/Outdoor, Meter Socket/Main Breaker
ER 19-238-A Service Entrance Manufactured (Mobile) Home
ER 19-240-K Service Entrance – Overhead, Single & Three Phase
ER 19-245-B Service Entrance – Overhead, 100, 200, or 320 Amperes, Self
ER 19-255-B Service Entrance – Overhead, Transformer Rated
ER 19-265-G Service Entrance – Underground,100,200,OR 320 Amperes
ER 19-266-D Service Entrance – Underground,100 OR 200 AMPS
ER 19-270-O Service Entrance – Underground, 200 & 320 Amperes Service
ER 19-280-B Service Entrance – Underground, Transformer Rated
ER 19-285-F Service General, Residential, Commercial, Industrial
ER 19-290-B Service Overhead, Attachment, Customer's Premises
ER 19-310-A Service Temporary, Single Phase, 120 or 120/240 Volts