Polaris 1000 User’s Manual
Page 22
5 Frequently Asked Questions
Q. Why is the kWh value of a new Polaris meter not zero?
A. Each Polaris meter must proceed a loading test with a calibration exam before put
in stock. The kWh value exists to make sure this unit passes the calibration exam.
Q. What is the meaning of Kt = 1Wh?
A. It means 1000 pulses will be output for every kWh. Another way of saying it is that
1 pulse is output for every Watt. The P indicator will flash once for every Watt
consumed.
Q. Does the Polaris meters come with its own CTs? Can I make use of my own
CTs?
A. The Polaris meters are sold with the CTs included which cannot be used direct
connects. The Polaris 1000 meters use DAE’s dedicated CTs and can accept
neither regular 5A output CTs nor dedicated CTs from other suppliers. The CT
input of the Polaris can only accept milli-amps which matches DAE’s dedicated
CTs. Connecting a regular 5A output CT directly will thus damage the Polaris
meters.
Q. Can the CT lead wire be extended?
A. Yes, the CT lead wire can be extended up to 2000 feet. An example of a suitable
cable would be the 7958A or the 7957A from Belden cables. It is important to
make sure to consult your local electrical codes for proper sizing requirements.
Q. Can a single CT be used to monitor multiple circuits?
A. It is possible to do so if the different circuits share the same phase and power
source. The L wire for each circuit must go through the CT in the same direction,
and the current rating of the CT in must be higher than the total amperage for all
the circuits to be measured.
Q. Can a single Polaris be used to monitor two different sub panels?
A. It is possible if the two sub panels have the same power source. If the two sub
panels do not share the same power source, then two separate Polaris must be
used.
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