Here are some sample CT requirements for typical house circuits:
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Simple installation concentrating on heavy loads using a single ECM-1240.
- Typical Home monitored with two ECM-1240 Devices.
- Home with 400A service and a remote sub-panel using three ECM-1240 Devices.
- Solar or Wind "Net" metering installation, also monitoring a few major loads.
- Multi-Tenant building (Seven Apartments).
Make sure your service is not 3-phase or powered from two phases of a 3-phase source.
If your house wiring uses aluminum wiring, the Micro-40 CT inner diameter may be too small for some of the wiring. This may require using Micro-80 CTs instead.
Simple installation concentrating on heavy loads using a single ECM-1240
Load (Breaker Amps) "S" or "D"(Single or Double Breaker) |
CT (Qty) |
ECM Channel |
ECM Device Number |
Main Panel (1 x 200A) D |
SPLIT-200 (2) |
CH1 |
1 |
Air Conditioning / Furnace (blower) (1 x 60A ) D plus (1 x 15A) S |
Micro-40 (3) |
CH2 |
1 |
Spa/Hot Tub (2 x 40A) D |
Micro-40 (1)* |
AUX 1 |
1 |
Clothes Washer (1 x 15A) S |
Micro-40 (1) |
AUX 2 |
1 |
| Clothes Dryer (1 x 30A) D |
Micro-40 (2) |
AUX 3 |
1 |
| Refrigerator (1 x 15A) S |
Micro-40 (1) |
AUX 4 |
1 |
| Electric Range (1 x 40A) D |
Micro-40 (2) |
AUX 5 |
1 |
| Other Unmonitored Loads |
None Required |
Software Generated |
N/A |
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| Bill Of Material (current transformers) |
2 x SPLIT-200 |
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10 x Micro-40 |
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Typical Home monitored with two ECM-1240 Devices.
Load (Breaker Amps) "S" or "D"(Single or Double Breaker) |
CT (Qty) |
ECM Channel |
ECM Device Number |
Main Panel (1 x 200A) D |
SPLIT-200 (2) |
CH1 |
1 |
Air Conditioning / Furnace (1 x 60A ) D plus (1 x 15A) S |
Micro-80 (3) |
CH2 |
1 |
Water Heater (1 x 40A) D |
Micro-40 (1)* |
AUX 1 |
1 |
Clothes Washer (1 x 15A) S |
Micro-40 (1) |
AUX 2 |
1 |
| Clothes Dryer (1 x 30A) D |
Micro-40 (2) |
CH1 |
2 |
| Refrigerator (1 x 15A) S |
Micro-40 (1) |
AUX 3 |
1 |
| Electric Range (1 x 40A) D |
Micro-40 (2) |
CH2 |
2 |
| Dish Washer (1 x 15A) S |
Micro-40 (1) |
AUX 4 |
1 |
| Microwave Oven (1 x 15A) S |
Micro-40 (1) |
AUX 5 |
1 |
| Kitchen Counter Outlets (4 x 15A) 2-D |
Micro-40 (4) |
AUX 1 |
2 |
| Various Lights & Outlets (4 x 15A) 3-S |
Micro-40 (4) |
AUX 2 |
2 |
| Bedrooms (2 x 15A) 2-S |
Micro-40 (2) |
AUX 3 |
2 |
| Bathrooms (2 x 15A) 2-S |
Micro-40 (2) |
AUX 4 |
2 |
| TV / Living Rm Outlets (1 x 15A) S |
Micro-40 (2) |
Aux 5 |
2 |
| Other Unmonitored Loads |
None Required |
Software Generated |
N/A |
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| Bill Of Material (current transformers) |
2 x SPLIT-200 |
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3 x Micro-80 |
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23 x Micro-40 |
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| * A single Micro-40 CT may be used for the Water Heater since it is a 240V load without a neutral. |
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Home with 400A service and a remote sub-panel using three ECM-1240 Devices.
Load (Breaker Amps) "S" or "D"(Single or Double Breaker) |
CT (Qty) |
ECM Channel |
ECM Device Number |
Main Panel #1 (1 x 200A) D |
SPLIT-200 (2) |
CH1 |
1 |
Main Panel #2 (1 x 200A) D |
SPLIT-200 (2) |
CH2 |
1 |
| Refrigerator (1 x 15A) S |
Micro-40 (1) |
AUX 1 |
1 |
Water Heater (1 x 40A) D |
Micro-40 (1)* |
AUX 2 |
1 |
| A/C Unit # 1 (1 x 60A) D |
Micro-100 (2) |
CH1 |
2 |
| Garage Lights and Outlets (2 x 15A) S |
Micro-40 (2) |
AUX 3 |
1 |
| Electric Range (1 x 40A) D |
Micro-40 (2) |
CH2 |
2 |
| Dish Washer (1 x 15A) S |
Micro-40 (1) |
AUX 4 |
1 |
| Microwave Oven (1 x 15A) S |
Micro-40 (1) |
AUX 5 |
1 |
| Kitchen Counter Outlets (4 x 15A) 2-D |
Micro-40 (4) |
AUX 1 |
2 |
| Various Lights & Outlets (4 x 15A) 3-S |
Micro-40 (4) |
AUX 2 |
2 |
| Bedrooms (2 x 15A) 2-S |
Micro-40 (2) |
AUX 3 |
2 |
| Bathrooms (2 x 15A) 2-S |
Micro-40 (2) |
AUX 4 |
2 |
| TV / Living Rm Outlets (1 x 15A) S |
Micro-40 (2) |
Aux 5 |
2 |
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| Remote Sub Panel: |
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| A/C Unit # 2 (1 x 60A) D |
Micro-100 (2) |
CH1 |
3 |
| Spa/Hot Tub/Sauna (1 x 50A) D |
Micro-80 (2) |
CH2 |
3 |
Clothes Dryer (1 x 30A) D |
Micro-40 (2) |
AUX 1 |
3 |
Clothes Washer (1 x 15A) S |
Micro-40 (1) |
AUX 2 |
3 |
| Pool Pump/Pool Heater (1 x 30A) |
Micro-40 (2) |
AUX 3 |
3 |
| Detached Building Outlets (3 x 15A) S |
Micro-40 (3) |
AUX 4 |
3 |
| Detached Building Lights (3 x 15A) S |
Micro-40 (3) |
AUX 5 |
3 |
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| Other Unmonitored Loads |
None Required |
Software Generated |
N/A |
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| Bill Of Material (current transformers) |
4 x SPLIT-200 |
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4 x Micro-100 |
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2 x Micro-80 |
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33 x Micro-40 |
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| * A single Micro-40 CT may be used for the Water Heater since it is a 240V load without a neutral. |
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Solar or Wind Installation. Provides "net" Metering.
Load (Breaker Amps) "S" or "D"(Single or Double Breaker) |
CT (Qty) |
ECM Channel |
ECM Device Number |
Main Panel (1 x 200A) D |
SPLIT-200 (2) |
CH1 |
1 |
Wind or Solar Inverter |
Micro-40A (1) |
CH2 |
1 |
Air Conditioning / Furnace (1 x 60A ) D plus (1 x 15A) S |
Micro-80 (3) |
AUX 1 |
1 |
Clothes Washer (1 x 15A) S |
Micro-40 (1) |
AUX 2 |
1 |
| Clothes Dryer (1 x 30A) D |
Micro-40 (2) |
AUX 3 |
1 |
| Refrigerator (1 x 15A) S |
Micro-40 (1) |
AUX 4 |
1 |
| Electric Range (1 x 40A) D |
Micro-40 (2) |
AUX 5 |
1 |
| Other Unmonitored Loads |
None Required |
Software Generated |
N/A |
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| Bill Of Material (current transformers) |
2 x SPLIT-200 |
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3 x Micro-80 |
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7 x Micro-40 |
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Multi-Tenant Dwelling (Seven apartments/60A panel each).
Load (Breaker Amps) "S" or "D"(Single or Double Breaker) |
CT (Qty) |
ECM Channel |
ECM Device Number |
Apartment #1 Total Panel (1 x 60A) D |
SPLIT-60 (2) |
CH1 |
1 |
Apartment #2 Total Panel (1 x 60A) D |
SPLIT-60 (2) |
CH2 |
1 |
Apartment #3 Total Panel (1 x 60A) D |
Micro-100 (2) |
AUX 1 |
1 |
Apartment #4 Total Panel (1 x 60A) D |
Micro-100 (2) |
AUX 2 |
1 |
Apartment #5 Total Panel (1 x 60A) D |
Micro-100 (2) |
AUX 3 |
1 |
Apartment #6 Total Panel (1 x 60A) D |
Micro-100 (2) |
AUX 4 |
1 |
Apartment #7 Total Panel (1 x 60A) D |
Micro-100 (2) |
AUX 5 |
1 |
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| Bill Of Material (current transformers) |
4 x SPLIT-60 |
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10 x Micro-100 |
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Make sure your service is not 3-phase or powered from two phases of a 3-phase source.
If your house wiring uses aluminum wiring, the Micro-40 CT inner diameter may be too small for some of the wiring. This may require using Micro-80 CTs instead.
