Frequently Asked Questions
Can you use additional sets of current transformers (CTs) with a submeter to accommodate more circuits?
Yes, you can use up to three sets of CTs in parallel per meter. Just make sure the current rating per phase is not exceeded.
For Multiple Meter Units (MMUs): Can single phase (3-wire) meters be used on a panel fed by three phase power?
Yes, but inform the factory when placing your order that multiple two-pole loads are to be metered in a three phase panel so that the MMU can be properly configured. If a panel schedule is provide the factory will pre-wire to voltage feeds to each meter in the MMU to the appropriate phases, thereby reducing installation time.
What is AMR equipment?
AMR stands for Automatic Meter Reading. In multi-tenant applications AMR equipment typically consists of wireless pulse transmitters, repeaters, a receiver and data collector that monitors and record data for billing or energy management purposes.
Do I need a third party billing service (RBC)?
RBCs (Read, Bill, and Collect companies) are typically used with larger multi-tenant facilities that want to generate tenant utility bills. RBCs will install, initialize, monitor, and maintain utility meters (electric, gas, and water), and they typically access meter readings daily (remotely, via phone or internet) and analyze them for abnormalities. This allows early detection and correction of meter or AMR problems, which maximizes utility cost recovery. Costs for these services are nominal and usually can be passed on to the tenant.
Why are IMS current transformers color coded (Black & white, red & white, and blue & white)?
For 120/240V power systems black wire is commonly used for Line 1 and red wire for line two. Thus when a meter is installed, a black CT will be installed on Line 1 and a red CT on line 2. This helps the electrician observe proper phasing. Likewise, on three phase 120/208V systems black is used for Line 1, red for Line 2, and blue for Line 3.
Can the meters be tampered with after installation?
All of the IMS meter enclosures provide a sealing method, such provisions for a wire seal, a loop for a small padlock, an adhesive label that destructs when tampered with, etc. Meter displays are non-resettable.