AC Kilowatt-Hour Meters
Meter forms, or the form number on an electric meter are the numbers that help us as meter techs determine what type of meter should go in a particular service. There are a variety of form numbers that are used. Here are the most common and the most common service types that they are used in. Form 1s. A form 1s meter a meter that was commonly used in single phase, 120v two wire services. Form 2s. The form 2s is by far the most common meter form out there. This meter is most commonly used in a 240v, single phase three wire service. Form 3s. Form 3s meters are typically used for single phase two wire services where the service is so large that it requires CT’s. Form 4s. Form 4s meters are used for single phase three wire services with two CT’s. Form 5s. Form 5s meters are transformer-rated meters that can be used in a variety of different service types. They can be used in anything from a 4 wire wye service to a 3 wire delta service. Form 9s. The form 9s is most commonly used in a 4 wire wye service. This meter is also used in a 4 wire delta service, also known as a high-leg service. Form 12s. Form 12s meters are self-contained meters that can be used on a few different services. They can be used on 3 wire delta three phase services as well as single phase services that are pulled off of a three phase transformer. Form 16s. Form 16s meters are self-contained meters that are most commonly used to meter 4 wire wye services.
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