Burnt prongs on power adapter

ipeemyself

macrumors newbie
Original poster
Jul 16, 2017
15
2
Hello! I recently purchased a 2017 15 inch MacBook Pro and when I went to plug in the power adapter for the first time into the outlet, there was a small spark and left the tips of the two prongs very slightly burnt. I was wondering if this could have damaged the charger, and damage the MacBook Pro when charging as well. It charged normally last night but I'm a little uneasy.
 

PBG4 Dude

macrumors 68030
Jul 6, 2007
2,781
2,000
That happens to mine too when I use the 2-prong adapter. I have an extension cord from a prior Mac and when using that, I don't see the sparks.

You can tell the difference between a grounded and ungrounded connector by looking in the groove of the part the slides over the metal circular disc portion of the power adapter. Grounded plugs have metal in this groove that connect to the circular disc to create the ground. Ungrounded plugs have no metal in the groove.
 

ipeemyself

macrumors newbie
Original poster
Jul 16, 2017
15
2
That happens to mine too when I use the 2-prong adapter. I have an extension cord from a prior Mac and when using that, I don't see the sparks.

You can tell the difference between a grounded and ungrounded connector by looking in the groove of the part the slides over the metal circular disc portion of the power adapter. Grounded plugs have metal in this groove that connect to the circular disc to create the ground. Ungrounded plugs have no metal in the groove.
Thanks for the reply. So just for peace of mind, is everything safe?? Is my power adapter still usable or should I get another one? Is my MacBook safe from charging with this power adapter? The burn marks on the prongs are very small, almost unnoticeable unless you look for it.
 

PBG4 Dude

macrumors 68030
Jul 6, 2007
2,781
2,000
The only way to know for sure is to contact Apple. I'm just saying that I've seen what you describe and how I work around it by using the grounded cable. I am surprised Apple still supplies an ungrounded plug by default.
 
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