Model A1237 or A1304 / 1.6, 1.8, 1.86, or 2.13 GHz Core 2 Duo processor

351 Questions View all

Electricity passes throug the MacBook to me

So, I was charging my MacBook air, its fairly warm, I touch my iMac, I notice my pinky feels tingly. I think its my iMac, freak out, touch it again to no avail. I then proceed to keep my MacBook air on my lap, and type on my apple wired keyboard connected to my iMac via a USB hub that is plugged into the wall. I feel the charge again and I realize the current is coming from my MacBook air.

Should I be worried? Because my iMac and my aluminum keyboard is "grounded" (well the socket this is all plugged into is not grounded... the house is old) and current goes through, does that mean that its the positive line that's live? because if it was neutral or ground it wouldn't go through... And how, if I should, should I approach this to apple?

EDIT: I just put my pinky on a screw on a light switch (So that's definitely grounded) and I definitely feel a current.

EDIT: The plug I was plugging into's ground is not actually grounded.

Answered! View the answer I have this problem too

Is this a good question?

Score 2

Comments:

Next time try to use a voltmeter- not your pinky

by

I re-wired my whole room (Its not in an apartment, but the house is 60 years old) and I made sure all the grounds work (APC's were not complaining of a "Building Wiring Fault") and it doesn't happen anymore. Albet my MacBook air is now charging off of an UPS instead of any ol power strip. Its interesting how some of these plugs are grounded and others aren't....

Also I knew that the MacBook was not receiving any more than what the charger provided, which for the MacBook air chargers, aren't that big because if it did receive any more it would have given me a warning that my charger was going crazy. And since all macs use their alum chasis (if available) as ground I was also wondering what was leaking? and where?

I talk to another friend and he said that all of his alum macs since his G4's did give him this mild shock. Probably his plugs are not connected right...

by

I have also same problem in my MacBook Air which was just bought on 17 October 2014. When I am using the plug in power socket and I feel some vibration its led and feel like power shock in my hand. Its really not good and why it happened ? this expensive too but work is not good.

by

Now I am in Israel and using Apartment which is really nice but I don't know about the wiring systems here in Israel?

by

Add a comment
Black Friday
Broken doesn't stand a chance.

6 Answers

Chosen Solution

Gabe get a outlet tester right away and check your outlets. You may have a hot side reversed with the ground-- a very dangerous condition. I would not use my computers until the electrics are tested and corrected if necessary. Let us know what you find. Ralph

Was this answer helpful?

Score 8

Comments:

Well does it count that when I plug in an UPC into the outlet, and it does not have a "building wiring fault" light on? I mean does that count as a outlet tester?

by

If it has a wiring test light I would say that counts. I am concerned about you getting shocked. That should not happen in a properly grounded house or with properly grounded electronics. I would seriously consider having a electrician check it out if you do not have proper test equipment to do so. Ralph

by

+ agreed

by

Heh... like @**& my landlord will pay for one... (sorry its just that my landlord is, well a big... *refrains from cursing*) But yes, I have a UPS from APC and it reports any problems (Including ground). Thats actually how I test the ground, when I plug it in, if the Building Wiring Fault light is on, most likely its ground.

by

Rj is correct , if your in an apartment complex most likely u have what is called a "homerun" dedicated to your apartment and if theres a reversed hot wire in a ground terminal that can be very dangerous? most likely all your outlets are "jumped" from one to another so I wouldnt even plug any electronics into any of those receptacles until you get that checked out. and for heavens sake, stop using your pinky as a tester. I tasted 277V and it temporarily blinded me. Plus the scare was enough for me to respect all 277V fixtures for the rest of my life. LOL

by

Show 1 more comment

Add a comment

Quit using yourself to detect potentially deadly voltages. Use a voltmeter. Quit touching two things to see if you get shocked.

Check AC and DC voltages between the case and the ground terminal of a known good outlet. You might be surprised what you see.

Outlet testers tell you the polarity is correct, and that the ground and neutral are at the same potential.

Was this answer helpful?

Score 4

Comments:

Here here. Stop trying to hurt yourself. Voltmeters trump outlet testers every time. I worked with an electrician who plugged his outlet tester into the outlet and it said it was good, but my meter told me it was getting 240v.

by

Add a comment

I think theres a matter of Electrical Standards involved here. I dont know if USA wiring standards specify which connector in an AC outlet is Active and which is Neutral, but there is a hazard if the Active line is connected to what should be the Neutral contact and then an earth connection is made. I also know that newer outlets have 1 pin larger than the other, in theory to try to force observance of polarity, (YES, A/C current DOES have polarity)

Here in Australia, its easier with our angled slots, you cant plug an item in with the pins swapped unless it is deliberately done when the outlet is installed or the plug is put on the end of a cable.

Thats my take, you may be experiencing a neutral-to-earth leakage symptom, an ELCB would drop the circuit breaker real fast, but with reversed connections, it's anyone's game...

Was this answer helpful?

Score 0
Add a comment

Essentially ALL laptops I owned that had metallic bodies exposed shocked me when using non-grounded connections (macbook air 2012, sony vaio sz-110, toshiba, others I do not remember). It is NOT an issue of reversed polarity of the connection (the laptop's power adapters are not polarized so I can invert the connection and still get shocked). This appears to be a serious design flaw in the usual switching adapter of the laptops and I am surprised it is there and not fixed.

How I fixed it for my laptops:

1) For the MBA I now use the corded connector rather than the compact one. The former is grounded the latter is not.

2) For other machines that do not have a grounded connector I have a single banana-alligator cable that goes to the ground hole in the outlet and the alligator grabs onto the ground shield of an unused USB connector. Problem solved, but very inelegant.

Was this answer helpful?

Score 0
Add a comment

Hmmmmmmmm, sounds to me as though your Apple POS has a serious design flaw, the charger brick supplies +VDC to the computer, which should then go only to internal circuitry, the chassis should be on the 0VDC side of things. Take and throw it at apple for selling such junk.

the power brick is fed AC current, which it then processes down to the appropriate DC current to feed the computer, the nature of AC means that the brick can handle a power feed of either 'polarity' and works fine, sending the DC current in correct polarity to the device. OTOH, in the house wiring, you must have correct 'polarity' (even though AC current has none to speak of) because of the way the wiring connects to appliances, hence there is an 'Active', sometimes called Hot, there is a 'Neutral', which is NOT ground, and there is 'Earth'

A safety device called an ELCB works by detecting current 'leakage' from the neutral side to earth, though appliances, hands, etc and shuts off the supply, in less than a heartbeat. If the Active and Neutral connections are reversed, there is no protection, and Pinky Tingles can become major, often fatal, zaps...

Get ALL appliances checked by a COMPETENT electrician, and the house wiring too. ALL wall outlets should have the Active connection on the same side, and use 3-pin earthed plugs where possible, even get an earth wire system installed, and have all outlets updated to earthed.

Your house power supply is not just 'Lecktrickity', it deserves care and respect, lest it kills you. It can be more dangerous than an angry alligator

Was this answer helpful?

Score 0
Add a comment

Reading back, this guy might also have an awesome Static problem.

Cheap carpet, synthetic fabric yarns, higher humidity, rubber or synthetic shoe soles...

Yeapp, and the ground wire in the power outlets etc is a lovely place for that static to go, or thru the metal computer chassis etc to ground

MBA still a POS tho...

Was this answer helpful?

Score 0
Add a comment

Add your answer

Gabe will be eternally grateful.
View Statistics:

Past 24 Hours: 6

Past 7 Days: 27

Past 30 Days: 146

All Time: 7,572