GE Industrial Solutions EPM4500 Submeter - Manual (Page 32)

2–18 EPM 4500 SUB METER – INSTRUCTION MANUAL
INSTALLING THE SCAN TRANSPONDER CHAPTER 2: INSTALLATION
2.4 Installing the Scan Transponder
2.4.1 Procedure
If your application is for a metering system, use the following procedure to install
the scan transponder.
Z Plan for the transponders.
• Determine the number of services in order to determine the
number of transponders.
• Do not rely solely on the memory of the local engineers or of the
existing drawings.
Drawings may not have been properly updated to reflect as-built
conditions and memories are not always accurate. Use these as
guidelines and then perform a survey.
• Open electrical cabinets as necessary and locate every master
meter from the utility.
• Make careful note of the voltages of the various transponders.
Z Determine the number of tenant spaces.
• In residential applications, this number should be fixed.
Often apartments are laid out on a grid, such as by floor and by
line. In this case, the number of meters is simply the number of
floors times the number of lines. This information is needed
before any meters are installed or entered into the transponders.
• Determine which service feeds each metering point. This
information is vital to proper system operation.
Without this information, a laborious process of trial and error is
necessary to determine which transponder must be used for
each meter. This will increase the cost of certification and
commissioning of the system.
Z Determine the service size and type of meter for each metering
point.
• In residential applications, this is probably a constant amperage
across the entire job (either 50 A or 100 A with Series 10 meters).
Z Determine the number of telephone lines required and ensure
the lines are installed before the installation of any metering
equipment.
Z Determine the number of independent services.
• Typically there is one service per distribution transformer that
feeds the property, unless distribution transformers have parallel
secondaries, which is rare.
Z Determine the best location for each transponder.
• This is the closest point to the first point at which the feeders for
the service branch out into sub-feeders.
To find this point, follow the feeders from the secondary of the
distribution transformer (or the service entrance if the
transformer is off the property) and place the transponder at the
last point before the feeder breaks into multiple feeders.