GE Industrial Solutions EPM1500 Single Point Submetering System - Manual (Page 23)

CHAPTER 2: INSTALLATION
EPM 1500 SUB-METER – INSTRUCTION MANUAL 2–13
2.5 Installing the GE Transponder
2.5.1 Procedure
If your application is for a metering system, use the following procedure to install the
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 50A or 100A 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.
Locating 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.