PDA

View Full Version : Difference between MagSafe mains plug lead.




macsymacker
Dec 18, 2011, 11:06 AM
Hello everyone,

My question is simple.

Why does the extension cord plug lead consist of 3 parts, one being "grounding-earthing contact" whilst the short (direct) mains plug just have two ends (thus unearthed)?

Thank you.



miles01110
Dec 18, 2011, 11:07 AM
http://electronics.howstuffworks.com/everyday-tech/question110.htm

macsymacker
Dec 18, 2011, 11:15 AM
This doesn't really answer my question.

Electric shock can cause damage to the adapter with the short two pin plug just as well.

In UK both plugs come with grounding pin whilst in other countries i.e. Germany, it does not.

http://electronics.howstuffworks.com/everyday-tech/question110.htm

GGJstudios
Dec 18, 2011, 11:17 AM
Electric shock can cause damage to the adapter with the short two pin plug just as well.
That's why you should use a surge protector, as the ground wire won't protect against damage.

macsymacker
Dec 18, 2011, 11:20 AM
Ok, thank you however let me rephrase the question and ask again.

Why in the UK, both plugs come with ground pin whilst in other countries i.e. Italy or Germany, only the extension cord plug has the grounding pin?

That's why you should use a surge protector, as the ground wire won't protect against damage.

Gav2k
Dec 18, 2011, 11:23 AM
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Even with 3 pins the uk adapter isn't earthed! The third pin (earth) is required on a uk plug to open the neutral and live gates.

The power adapter is classed as a double insulated or class 2 device so no earth is needed

GGJstudios
Dec 18, 2011, 11:24 AM
Ok, thank you however let me rephrase the question and ask again.

Why in the UK, both plugs come with ground pin whilst in other countries i.e. Italy or Germany, only the extension cord plug has the grounding pin?
It might have to do with electronic device regulations being different in different countries.

macsymacker
Dec 18, 2011, 05:25 PM
Thank you for explaining and thanks to everyone for their participation.
Appears to be my deep confusion and stupidity on the subject.
Cheers! ;-)

Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Even with 3 pins the uk adapter isn't earthed! The third pin (earth) is required on a uk plug to open the neutral and live gates.

The power adapter is classed as a double insulated or class 2 device so no earth is needed

Total Respray
Dec 24, 2011, 03:00 AM
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

Even with 3 pins the uk adapter isn't earthed! The third pin (earth) is required on a uk plug to open the neutral and live gates.

The power adapter is classed as a double insulated or class 2 device so no earth is needed

The third pin is indeed necessary to open the gate for the other pins, but on non-double-insulated devices the top pin is earthed as well.

Gav2k
Dec 24, 2011, 05:45 AM
The third pin is indeed necessary to open the gate for the other pins, but on non-double-insulated devices the top pin is earthed as well.

Incorrect the earth isn't used by the adaptor In any way!

Total Respray
Dec 24, 2011, 07:11 AM
Incorrect the earth isn't used by the adaptor In any way!

You are correct with regards to the mag safe adapters, but as per my post, the third pin is earthed for non-double-insulated devices. Granted, this may not include current Apple adapters.