A single Micro-CT may be used to monitor a typical single 15A or 20A circuit.

In this example, only one CT is connected to a channel of the ECM-1240. This scenario would be the case for loads such as:

• Refrigerator
• Clothes Washer
• Sump Pump
• Dish Washer
• etc.

Two Micro-CTs may be used to monitor two standard single pole 15A or 20A circuit breaker.

In this example, both CTs are connected to a channel of the ECM-1240. The reasoning behind using this method is to reduce the number of monitoring channels required. Typically this setup would be used for two seldom used branch circuit or two circuits related to a common room or application. Examples are:

• Outside Receptacles and Outside Lighting
• Room Receptacles and Room Lights
• etc

Two CTs may be used to monitor a typical double pole circuit breaker.

This method is typical for most large 240V loads such as:

• Central Air Unit
• Clothes Dryer
• Electric Cooking Range
• Hot Tub/Spa

Limitations

One CT may be used to monitor a 240V double pole circuit breaker ONLY IF the connected load is strictly a 240V load with no neutral connection.

Below is a list of some common 240V loads which may not use a neutral conductor. Verify this for your application before slecting this method

• Water Heater
• Baseboard Heating
• 240V Well Water Pump

5. Two 240V Breakers - Two CTs - One Channel.

Limitations

Two CTs may be used to monitor two 240V double pole circuit breaker ONLY IF the connected loads are both strictly a 240V load with no neutral connection. An example of such a connection would be to monitor two baseboard heaters using a single channel.

Below is a list of some common 240V loads which may not use a neutral conductor. Verify this for your application before slecting this method

• Water Heater
• Baseboard Heating
• 240V Well Water Pump

Some installations may restrict ability to disconnect the breaker power to install a donut-style CT or there may be other physical restriction that would warrant using a "split-core" CT.

If this load is to be connected to CH1 or CH2 then a SPLIT-60 or SPLIT-100 may be used.

If this load is to be connected to the ECM-1240's AUX channel then a TT-100 CT must be used.

This example is not un-common. Typical applications are:

• 240V Central A/C Unit and 120V Furnace circulating fan. Both of these loads can represent the "cooling system" energy use.
• 240V Clothes Dryer and 120V Clothes Washer.

The scenario is commonly used to "group" related panel circuits together. Examples are:

• Three breakers associated with a specific room
• Three rarely used panel circuits (outdoor outlets, emergency sump pump, etc)
• Three circuits which use very little power (house alarm, etc.)

The scenario is commonly used to "group" related panel circuits together. Examples are:

• Kitchen counter duplex receptacles
• Three breakers associated with a specific room
• Three rarely used panel circuits (outdoor outlets, emergency sump pump, etc)
• Three circuits which use very little power (house alarm, etc.)

This method is not recommended unless the two loads are of low current or usually not operated simultaneously. An example of this is "Air Conditioning Unit" and "Baseboard Heating" which should never be on at the same time.

The scenario is commonly used to "group" related panel circuits together. Examples are:

• Kitchen counter duplex receptacles
• Three breakers associated with a specific room