GSK72 (Customer) asked a question.

October 14, 2026 at 2:10 AM
Socomec Diris A10 Meter Measuring Delta Config

Hi, I was wondering, I am working on a project that has an electric heater that I want to know the heat output of it. I got this power meter, and I did not realize that it cannot do delta configuration. I just want to see if someone could provide give some insight to a thought of mine. From my understanding, the current, voltage and power factor should not be affected by the configuration as that is purely dependent on what the voltage and current measurements are on each leg of the 3P. After that, the only thing that changes are the power equations. Can someone confirm if I have the correct understanding.

 

Thanks!

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  • K Price (Customer)

    I see. Thank you. Well, you could still use this to measure a line current and a L-L voltage and use the formula watts=line-to-line volts x line amps x sq root-3, and make those above assumptions. If used for relative heater power, and don't need point-of-sale-type absolute accuracy, this should work. Interesting, you must have an old electrical system that you have 480V delta. Is this corner-grounded? or mid-grounded? Floating? I've seen this in like 50's era buildings. Newer systems are 277/480 V, "Y", with the neutral grounded, and they use the 277V (Line-neutral) for 277V lighting.

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  • K Price (Customer)

    It also depends on the accuracy you are looking for, and your budget. If this is a resistive-type electric heater, then power factor =1, and watts=volts x amps, and assume a balanced system, then watts=line-to-line volts x phase amps x square root-3. And if we assume constant, balanced voltage, we just need to measure amps in (1) leg. But we never have a purely 100% resistive circuit, so power factor is never exactly 1, and we never have a completely, continuously balanced circuit (balanced/ constant supply voltages and balanced 3-phase heater coil loads). It comes down to how much we want to assume and how much money we can spend. There are watt meters that are designed for delta systems and measure amps in (2) legs and L-L voltage between all (3) legs. More expensive, but designed and spec'd for delta systems.

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    • GSK72 (Customer)

      Hi,

      Since we have already purchased them and wired them in. I am really more concerned with the amp draw and voltage and some of the power factor. When I asked the tech people at AD if they have one that can measure delta configuration and they don't have one. When looking at the current clamps that can do 3P and 480 VAC voltage monitors, their cost was nearly X3 compared one of the power meter. From what you are saying that the current and voltage measurements should be good enough, I can do the calculations separately since what I need is the real power as that is the heat going into the process.

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  • K Price (Customer)

    I see your situation better. I also see that, yes, AD power meters do not support delta systems. If you assume power factor of 1 (should be fairly close to 1 if resistive heater), and assume each heater coil phase is the same load (should be fairly close if consistent quality heater coils), and assume voltage supply is the same between phases (this depends on your electrical system, loads, etc.) then if you have (1) CT to measure line current and measure L-L voltage between (2) legs, then watts=line-to-line volts x line amps x sq root-3. Which AD power meter did you install? Which CT did you install?

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    • GSK72 (Customer)

      Here is the part number: CTF-5RL-0050

  • K Price (Customer)

    This is the CT you installed, Which power meter did you install?

    • GSK72 (Customer)

      Yes, the CT is installed. Here is the power meter that we got 4825U011.

  • K Price (Customer)

    I see. Thank you. Well, you could still use this to measure a line current and a L-L voltage and use the formula watts=line-to-line volts x line amps x sq root-3, and make those above assumptions. If used for relative heater power, and don't need point-of-sale-type absolute accuracy, this should work. Interesting, you must have an old electrical system that you have 480V delta. Is this corner-grounded? or mid-grounded? Floating? I've seen this in like 50's era buildings. Newer systems are 277/480 V, "Y", with the neutral grounded, and they use the 277V (Line-neutral) for 277V lighting.

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    • GSK72 (Customer)

      I don't know anything about it other than the heating capacity and that it is a delta configuration. We know it was about 15 years ago. We know it has to be delta as it uses a type of control where you turn two of the phases on and off based on when it intersects with the zero. From what I have seen, it seems to be a floating ground, unless it uses the case it is in to see a ground. That's really all I know about it, I was not around when this got installed and only recently it was decided that we needed to know the power of this heater for the process. That was my task to get that set up.

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  • K Price (Customer)

    You are talking about the heater coil configuration, that the individual heater coils are connected in a delta-type connection. This is not the power supply to the control panel from the buildings circuit breaker panel. So your building's power system may be a 277/480V "Y", neutral-grounded system? If this is true, then you can use the power meter as designed. When the specs say "Does not support Delta power system configurations", they are not talking about how the heater coils are connected, they are talking about the power system in the building that powers your control panel. Can you identify your building's power system configuration that controls your control panel? I believe AD tech support, and myself, misunderstood when you said "I did not realize that it cannot do delta configuration". You were talking about the heater coil connection configuration, not the building's power system configuration.

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