Electronics > Beginners

New 2017 Macbook Pro 15 Inch giving me static electric shock. Is it normal?

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wraper:

--- Quote from: electrolust on August 29, 2017, 11:18:36 pm ---
--- Quote from: wraper on August 29, 2017, 10:10:27 pm ---
--- Quote from: jmelson on August 29, 2017, 09:51:34 pm ---
--- Quote from: grumpydoc on August 29, 2017, 07:11:50 pm ---

Take it to an electrician who can do portable appliance testing - if it is outside the leakage limit (250uA if the charger is double insulated and has no earth connection) then you have a claim against the retailer.

--- End quote ---
I really doubt the leakage is below 250 uA, or the OP would have been very unlikely to feel it.  I suspect it is WAY more than that.

Jon

--- End quote ---
0.25A feels quiet noticeably when current passes through you.

--- End quote ---

the number being discussed is .000250A, not .250A

--- End quote ---
Obviously that was a typo and 250uA = 0.25mA was meant. ) 0.25A will fry you, and if passes from hand to hand, very likely kill.

amyk:

--- Quote from: jmelson on August 29, 2017, 09:51:34 pm ---
--- Quote from: grumpydoc on August 29, 2017, 07:11:50 pm ---

Take it to an electrician who can do portable appliance testing - if it is outside the leakage limit (250uA if the charger is double insulated and has no earth connection) then you have a claim against the retailer.

--- End quote ---
I really doubt the leakage is below 250 uA, or the OP would have been very unlikely to feel it.  I suspect it is WAY more than that.

Jon

--- End quote ---
Different people have varying sensitivity to currents passing through them, and also varying resistance. If you search around you will find plenty of others saying they can feel it too.

Due to the safety standard of 250uA they may have designed it to put almost 250uA into a dead short (the higher the cap value, the better the EMI suppression), but with a human and its resistance in the circuit, that number can only drop. And 250uA is definitely noticeable.

Ian.M:
It needs testing.   If it reads above about 200uA on an ordinary DMM, its worth getting it tested by an electrician with a calibrated PAT tester who can certify whether or not it is defective.  Start by measuring voltage across a 10K resistor to avoid blowing your DMM if its *far* more than 250uA.  Accross 10K, you get 1V per 100uA.

If its even 1uA over the permitted limit you can reject it as defective.   However as I stated earlier I suspect it will creep in under the limit and the only option will be to get an Apple adapter for the PSU that grounds it effectively.

electrolust:

--- Quote from: wraper on August 29, 2017, 11:33:58 pm ---Obviously that was a typo and 250uA = 0.25mA was meant. ) 0.25A will fry you, and if passes from hand to hand, very likely kill.

--- End quote ---

You changed the prefix (for some reason), and this is the beginner section.  So no, it was not obviously a typo.  For example, it wasn't obvious to me, a beginner.   :-//

You did cause me to google it, and the top result is https://www.physics.ohio-state.edu/~p616/safety/fatal_current.html which claims that 100-200mA is deadly due to v.fib, whereas above 200mA has very good survivability as the heart stops at higher currents.

wraper:

--- Quote from: electrolust on August 30, 2017, 06:21:39 am ---You changed the prefix (for some reason), and this is the beginner section.  So no, it was not obviously a typo.  For example, it wasn't obvious to me, a beginner.   :-//

--- End quote ---
:palm: |O I changed units for a reason that uA may look like very small current for some people (beginners). If I quote a current value, and write the same value but in different units and miss a letter while typing, it's a typo. The fact that something is not obvious to you, means only that you should learn more. Not that a typo magically stops being a typo.

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