EMF in house due to wrong wiring.

Today, We called a building biologist, measured EMF level in office. It's pretty high, from 7mG to 20mG going around the building.
There are two electricity conduits. He measured the two conduits and said EMF is caused by imbalance between hot wire and neutral, not canceling. One conduit shows 2A and the other shows 7A.
First, what does it means not canceling and why 2A and 7A is the proof of wrong wiring?
Also, in order to find where is the wrong wiring(if it's wrong wiring, I guess, it's not on breakers on panel, but some wiring on lights and wall outlets... just my guess), where can we start to find? Maybe shutting down some circuits and measure current and EMF?
I have a EMF detector, but not a tool to measure current. What device is used to measure returning current on conduit?

I have zero knowledge of electricity, but just curious why this happens. Most of work will be done by an electrician, but also was shocked that even an certified electrician has not pointed out this problem before.

We occasionally hire a service guy who's not an certified electrician when we install switch, light, and wall outlet. What I'm guessing now is he didn't use the neutral and hot wire from the same circuit.

this excessive EMF happens on both major conduits. If you're knowledgeable on electricity, please let me know how I can trace to find where are the wrong wiring happens and any device to measure the not cancelling current
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crcsupportAsked:
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Dave BaldwinFixer of ProblemsCommented:
One conduit shows 2A and the other shows 7A.
That is a bogus problem.  Since most electrical appliances and devices are single phase, they will draw varying current thru the different branches.  You can see that by turning off all the lights in one room and leaving them on on the other side of the office.  

Watch out for people using scare tactics about 'EMF', there is a lot of bogus info out there.  This PDF http://www.ct.gov/dph/lib/dph/environmental_health/eoha/pdf/emf_fact_sheet_-_2008.pdf from Connecticut gives info and links to other governments sources.
Dave BaldwinFixer of ProblemsCommented:
One other thing to note is that 'EMF' of any kind of frequency is a 'square-law' phenomenon.  If you get a reading at one distance, if you move away twice that distance, the 'EMF' should go down to a fourth of the first measurement.  That also means that it varies as you go around the office.  Sitting at your desk should show less 'EMF' than standing beside the electrical panel where all the power comes in.  Probably much less.
crcsupportAuthor Commented:
Yes,EMF level changes as I stay away from conduit, the problem is the conduit running across 3 offices on 2nd floor which exposes high EMF to workers. So, I have to make sure there are 2mG or under it which WHO recommends.
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Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
This link contains some explanation of how an imbalance can occur and what it is:

http://m.emfservices.com/electric.htm

It seems that you can't tell there is an imbalance without special equipment, so it's a sort of invisible problem.

They say the current flowing in one direction through the conduit should be balanced by current flowing the other way. But it's AC  isn't it? Flows both ways most of the time I thought.
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
This link contains some explanation of how an imbalance can occur and what it is:

http://m.emfservices.com/electric.htm

It seems that you can't tell there is an imbalance without special equipment, so it's a sort of invisible problem.

They say the current flowing in one direction through the conduit should be balanced by current flowing the other way. But it's AC  isn't it? Flows both ways most of the time I thought.
crcsupportAuthor Commented:
Also, the reason why I looked into this and bought the EMF measurement tool was because recently I moved to the room and found that I feel dizzy while I work in the room. When I move another room, I was ok. So, I bought EMF detector and measured, surprisingly, the room shows contigous 15-20mG low frequency EMF which is almost equal to standing 1 foot away from a running microwave ALL DAY.

Later using the detecor, I found there is the big conduit going right under my room at downstairs. it's 50-60mG 1 foot away from the conduit. Now the building biologist says, it's due to returning current not cancelling out and has to find where is fault wiring, it's up to me to do it.

I definitely believe the EMF affects health because I experienced now. Maybe I'm too sensitive to EMF than others. Who knows.

Anyway, I have to find a way to find where are the fault wiring issue is and how to trace and get rid of this.

I thank you all for providing any information which helps me to do it.
crcsupportAuthor Commented:
https://www.youtube.com/watch?v=z-KfZvbjyBY

Looking at the above video, it also shows that current shows nearly 0amp cancelling on hot and neutral wires together.
But if fault wiring is done and showing current is not cancelling, then how to find where is fault wiring is the issue because the circuit will show all same reading. Maybe I have to trace one by one wire while turning off, but as Mike said, I can't do that since the wire is inside dry wall.
I'm wondering if there's any tracer I can do without tearing off walls.
Dave BaldwinFixer of ProblemsCommented:
While there can be leakage due to an alternate return path that you are not measuring, current in both directions is Always the same when all paths are considered.  Current does not just disappear somewhere along the way.

And the fact that you felt dizzy in that room does not by itself establish an 'EMF' field as the cause.
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
It sounds like the imbalance can be caused by using a live from one cable and a neutral from another cable, possibly running down a different conduit. The site I posted a link to has a number of examples shown by photos. One easy possibility is stair light wiring where you have a switch at both top and bottom. Each could easily take their power from the nearest circuit to the switch so could link both the upstairs and  downstairs wiring. It's something I was unaware of but if you are feeling ill effects ryhen it is worth investigating.
Other possibilities include damage to cables as well as incorrect wiring.
Hopefully the terminals of all your cables are accessible by removing outlets etc. With the power off and fuses removed you could disconnect at strategic points and trace the wiring out using a meter and a small dry cell to provide a voltage.

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