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Your guide for determining:

1. What CT is required for each load (electrical appliance or device) you wish to monitor.
2. Whether the monitored load will share a monitor channel with one or more additional loads.
3. The number of ECM-1240 devices that will suit your requirements.

Before proceeding, you should be aware of a few facts:

1. Even though the ECM-1240 is a 7-channel energy monitor, CH1 and CH2 are different than the AUX1 to AUX5 channels. (see chart below for more detail).
2. Some CTs are limited for use with certain channels.
3. When grouping several loads on a single channel the CTs used for this must be the same model.

Differences between CH1/CH2 and AUX1-AUX5:

The ECM-1240's CH1 and CH2 channels function differently than the AUX channels. The differences are decribed below.

CH1 and CH2	AUX1 to AUX5
Capable of a large range of power measurement	Has a standard range up to 80A per channel. May be extended to 160A using special configuration or CT.
Capable of "net" metering required for renewable energy systems monitoring.	Unable to do "net" metering.
Can be configured to use any of the Brultech CTs and many common CTs from other sources.	Limited to the following CTs: Micro-40 Micro-80 Micro-100 TT-100
Favorable for measuring full panel, sub-panel and large loads due to its exceptional dynamic range. Also measures small loads accurately.	Typically used for various panel circuits up to 40A.

 

Verify that your service is not 3-phase or powered from two phases of a 3-phase source.