Micro-CTs on ECM-1240 CH1/CH2, definitive information?

[sandeen]

I've found bits and pieces of information in the forums, but it never seemed to make it to the documentation.

This is what I think I understand from what I've read - I hope someone can confirm or deny, and then maybe get it into the documentation at some point...

For an ECM-1240:

• micro-40, micro-50, and micro-80s can be used on the CH1/CH2 inputs
• Micro-CTs should be connected between COM and DUAL terminals
• Multiple Micro-CTs are wired in parallel, not series.
• A 4.99ohm resistor should also be installed between COM and DUAL
• The CT settings for Micro-40 and Micro-80 CTs should be type 169, range 4
• The CT settings for Micro-50 CTs should be type 168, range 4

And:
If a single CT is used on 1 leg of a 240V load with no neutral, then:

• The CT settings should use range 3 instead of range 4 (this doubles the values)

Is that all correct? (note: re-edited after Ben's comment below, should be correct now)

Thanks,
-eric

[ben]

For an ECM-1240:

• micro-40, micro-50, and micro-80s can be used on the CH1/CH2 inputs
• Micro-CTs should be connected between COM and DUAL terminals
• Multiple Micro-CTs are wired in parallel, not series.
• A 4.99ohm resistor should also be installed between COM and DUAL
• The CT settings should be type 169, range 4

And:
If a single CT is used on 1 leg of a 240V load with no neutral, then:

• The CT settings should be type 169, range 3 (this doubles the values)

Is that all correct?

The Type for Micro-50s are 168, but the rest is correct.

Ben

[sandeen]

Thanks Ben, I'll edit the original post to avoid confusion.

It'd be great to get the updated info into the CT settings doc.

-Eric