Humming then main trips

[pjones]

Do you have access to an iFlex?

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[hillbilly1]

This is the one I have, works great! Bluetooth connectivity so you can connect it, move away and get out of the monkey suit to watch it on your phone.

Welcome to TruTech Tools, Ltd - Quality Tools. Essential Support.

 

[AC\DC]

I will be buying that after this situation

 

[Little Bill]

I will be buying that after this situation

Charge enough on this job to buy the clamp!

 

[ptonsparky]

Charge enough on this job to buy the clamp!

I agree, do it now. New Toys are always worth it!


Tools, I mean tools...

 

[gadfly56]

I agree, do it now. New Toys are always worth it!


Tools, I mean tools...

Hmmmm, your Freudian slip is showing!

 

[AC\DC]

Arrives tomorrow. I turned off two heater loads I think are the issue and so far no call backs. I’ll post results when i can

 

[GoldDigger]

Hmmmm, your Freudian slip is showing!

You do know the definition of Freudian slip?

It's where you say one thing but mean your Mother.

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[AC\DC]

Well I went out right now and turned every heater on and it held at 195 for 10 minutes. Took the new clamp meter around the wires for the 200 amp main. Then took a reading of each A phase wire feeding it.
then took my dumb FLIR one ( never buy FLIR)
And took took this picture.
Then I went to turn of one heater so it would not be so warm. Then proceeded to gently move the top a phase wire. The humming would change sound every time I moved it. The. I noticed the amps clipping and not matching other a phase wire. Then it hit 139 on the one wire and popped
I think Bill was right looses connection.
Power company is coming out and I am going to check all connection.
Or that wire is rubbing on something as it vibrates. Either way seems to me it’s in the new panel
I think I am going to stick with CH panels
Unless they compensate me if it is there fault

 

[ptonsparky]

Now that you are in the tool buying mood, get a Fluke 87, or similar, so you can read mV. An old school FOP check would have found your problem within the first few minutes. Both times. Then again so would have the Flir, but at a safer distance.

You still needed that new meter

ps: that breaker is overloaded. A 190 amp load on a 200 is asking for trouble. IDC what the charts and graphs say. PP design.

 

[kwired]

Well I went out right now and turned every heater on and it held at 195 for 10 minutes. Took the new clamp meter around the wires for the 200 amp main. Then took a reading of each A phase wire feeding it.
then took my dumb FLIR one ( never buy FLIR)
And took took this picture.
Then I went to turn of one heater so it would not be so warm. Then proceeded to gently move the top a phase wire. The humming would change sound every time I moved it. The. I noticed the amps clipping and not matching other a phase wire. Then it hit 139 on the one wire and popped
I think Bill was right looses connection.
Power company is coming out and I am going to check all connection.
Or that wire is rubbing on something as it vibrates. Either way seems to me it’s in the new panel
I think I am going to stick with CH panels
Unless they compensate me if it is there fault

I thought you replaced meter-main? or at least the main breaker? Still have loose connections after that?

Though 195 is pushing it a little it should still hold pretty much indefinitely if everything is in good condition. Any resistance in connections or switch contact and it will probably heat up and trip on thermal operation.

 

[AC\DC]

I did replace meter main. The loose connection on breaker was found when installing new panel. It looks as thoug either running wires behind caused an issue with conductor rubbing. Or there is a loose connection on meter side for the top A phase wire

 

[kwired]

You installed a new main but plugged it onto original panel bus bars?

If those bus bars had been overheated before, the connection is still compromised, if you heated up the new breaker bus plugs, it may now be compromised. Need to replace both.

 

[AC\DC]

ps: that breaker is overloaded. A 190 amp load on a 200 is asking for trouble. IDC what the charts and graphs say. PP design.

I agree. Once I fix this issue, I Write a letter to owner about that.
The PO just sent me 4 years of peak 41.85kw meter reading taken last year. Meter reading is at 15 minute intervals

 

[AC\DC]

I changed the whole assembly. It was a Siemens meter main with 16 spaces. I went to square d main breaker with 20 spaces.Only thing that is original are the branch circuit
Sorry about confusion

 

[AC\DC]

I replaced meter main to the right

 

[AC\DC]

Thank you guys for your help. Found out it was a lose connection coming off the load side of the meter. Parallel A phase is within 4 amps of each other now.
Still a light hum on the meter side.. but nothing is lose or overheating.

 

[ptonsparky]

So each of your 4 incoming lines is carrying about 80-90 amps? 160 to 180 per phase? What size are the wires going to the breaker from the meter lug?

 

[AC\DC]

Yes ,on the amps per phase.
Their was no markings I could see on the conductor, they were copper looked to be #2.