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Author Topic: Blow both 50a and main 100a at service  (Read 279 times)

Upinsmoke

  • Posts: 1
Blow both 50a and main 100a at service
« on: August 18, 2019, 03:18:45 PM »
Own a 2004 Alfa see ya
Recently discovered my ATS was fried  on L2 side ( melted ATS lug ) REPLACED
We have had no issues until ATS finally dropped L2.
so prior to replacing ATS , we could use 50a .
ATS was replaced wire for wire into lug for lug so I am confident it is wired correctly.

OK
I plugged back into service pole. Waited for Surge to kick in, went into coach and ( with all loads off) hit the 50a at my panel. The fridge , ( which I plug in via separate cord to 20a ) went off.
I am like WTH.
And go out to discover the entire pole service has tripped at the 100a main....
I removed my plug from 50a  at pole switched to 30a , and we have no issues .
WHAT IS GOING ON?
Help appreciated .
Please ask questions
Please provide great answers.
I am confident I have reliable service from pole to surge protector

donn

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  • Posts: 3548
Re: Blow both 50a and main 100a at service
« Reply #1 on: August 18, 2019, 04:39:33 PM »
You have a dead short.  Disconnect everyrhing and reinspect the plug you just repaired. 

ChasA

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  • Posts: 1026
Re: Blow both 50a and main 100a at service
« Reply #2 on: August 18, 2019, 04:54:38 PM »
Is your new ATS the same brand, model and version as the old one?
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John From Detroit

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  • ^My New Home^
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Re: Blow both 50a and main 100a at service
« Reply #3 on: August 18, 2019, 05:22:24 PM »
I would go with the Dead Short .... 100 amp Main at the park Distro box. that's nice..

First plug in just the EMS make sure the park is wired right. then turn off 50 amp breaker'
But re-check the wiring on the ATS.> i'm guessing you crossed a terminal or three.
Nothing adds excitement like something that is none of your business
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Arch Hoagland

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  • Posts: 2961
  • Clovis CA
Re: Blow both 50a and main 100a at service
« Reply #4 on: August 18, 2019, 08:04:49 PM »
When troubleshooting electrical problems I like to start at a known good position and go from there.

So first I would:

Disconnect from the 50 amp service pole and check it's output as follows...

Measure the voltage from line 1 to ground.

Measure the voltage from line 2 to ground.

Measure the voltage from line 1 to neutral.

Measure the voltage from line 2 to neutral.

Let us know what those voltages are.
 
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grashley

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  • Posts: 6067
  • Western KY for now.
Re: Blow both 50a and main 100a at service
« Reply #5 on: August 19, 2019, 07:07:18 PM »
I agree with Arch's approach.
1. Is the power at the pole good?
2. Is my power cord good?  (check same parameters)
3. Is power still good at first connection in the RV? 
4. At the second connection?

Let's isolate the issue a bit closer than between the pole and the main RV breaker.
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