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My MagSafe adapter has suffered from strain relief and the insulation is completely frayed off near the tip (it is the newer L-shaped adapter rather than the old T-shaped adapter). It still seems to charge the computer. Is there any risk to my physical safety from continuing to use it?

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Which part of the insulation, the white one covering the whole cable or the insulation of the individual wires? –  patrix May 14 '12 at 12:43
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add a picture of the damaged area - internal wires if possible.. –  DefenestrationDay May 14 '12 at 13:57
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2 Answers

up vote 1 down vote accepted

Frayed jacketing represents a potential fire hazard if the wires themselves become exposed and overheat, short, and/or arc. Provided only the jacketing is frayed, you could use electrical tape to provide protection to the internal wires or you could add a sleeve or heat shrink tubing.

A safe answer is to order a replacement from Apple in order to protect yourself, your device, and your property.

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The same voltages that you find on those wires will also be present on the contacts of the magsafe connector itself. Since these are accessible to a finger, you can be pretty sure that there are no harmful voltages there. I think the biggest potential danger is if the wires short out and enough heat is generated to start a fire. Even that possibility sounds rather far fetched to me, but I won't totally rule it out. The power adapter ought to contain circuitry to protect against that, however.

(I don't usually add disclaimers to my scribblings on the net, but one seems in order here: I am not an expert, just a moderately competent amateur in the field of electronics.)

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It's the amperage that'll kill you. A 16.5VDC/85W MagSafe charger would have ~5A going thru it. Would that kill you? Probably not. Also the adapter requires the center pin to be activated prior to power being run thru the two positive pins. –  user7116 May 14 '12 at 20:22
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