IMPORTANT: These installation instructions are for use by a licensed electrician only. To avoid electrical shock, do not perform any servicing other than what is contained in this User Guide unless you are a licensed electrician and qualified to do so.


  1. Read these instructions.
  2. Heed all warnings.
  3. Follow all instructions.
  4. Do not use this apparatus near water.
  5. Clean only with dry soft cloth. Household cleaners or solvents can damage the finish on your Sonos components.
  6. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
  7. Unplug this apparatus during lightning storms or when unused for long periods of time.
  8. Warning: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
  9. Do not expose apparatus to dripping or splashing and do not place objects filled with liquids, such as vases, on the apparatus.
  10. Jetlun recommends that a licensed electrician install the Circuit Meter.
  11. Jetlun recommends that the Circuit Meter (model RD77719) be installed either in an electrical enclosure (panel or junction box) or in a limited access electrical room.
  12. Verify that circuit voltages and currents are within the proper range for the Circuit Meter and CT Module.
  13. Jetlun recommends using only current transformers (CTs) from Jetlun, which has been calibrated to work with the Circuit Meter. Using off-the-shelf CTs from third parties will affect the accuracy of the measurements.
  14. Before turning on power to the Circuit Meter, ensure that all the CT modules and wires are securely installed by tugging on each wire.
  15. Equipment must be disconnected from the HAZARDOUS LIVE voltage before access.
  16. Do not install the Circuit Meter where it may be exposed to excessive moisture, dust, salt spray, or other contamination. 
  17. Do not drill mounting holes using the Circuit Meter as a guide; the drill chuck can damage the Circuit Meter housing or screw terminals.
  18. If the Circuit Meter is installed incorrectly, the safety protections may be impaired.