Wrench Slip Arc, Lost ring finger |
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Wrench Slip Arc, Lost ring finger |
ctc911ctc |
Jan 31 2020, 10:28 AM
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#1
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Senior Member Group: Members Posts: 917 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
Back in the 60s, my father took our car to a local mechanic who did not have a ring finger. Herb (my dad) explained that the mechanic most likely lost the finger working on a car with hot wires which heated his ring.
The image of a red-hot ring on my finger stayed with me. As a result, I ALWAYS take the battery out of the circuit AND take my ring (watch too) off when tooling around the car. I have been looking to install a quick battery disconnect and wondered why they are all on the negative side of the battery. On the EE (theory) side of the equation, this is not as logical as the positive (not to open a can of worms) but on the practical side, I did not know why. Dug around for a while until I found the reason buried in a very weird board about ATVs. The writer's referenced "Wrench Slip Arc" as why you disconnect the negative. For no other reason than you want to wrench the POSITIVE first so if you slip the wrench you are not then holding a filament. To me, this was an epiphany and decided to share this matter of safety. Please forgive me if this topic has been explored to exhaustion in your respective spheres. CTC911CTC |
ClayPerrine |
Jan 31 2020, 06:46 PM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,820 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
For no other reason than you want to wrench the POSITIVE first so if you slip the wrench you are not then holding a filament. I disagree. I see lots of people disconnect the positive cable. If you do that, you risk sparks and/or a direct shorted battery if your wrench touches ANYTHING while disconnecting the cable. If you disconnect the negative first, the only possible way to short out your battery is to hit the positive post with the other end of the wrench. And if you keep a plastic post cover over it (or even just some painter's tape) you can't short out the battery. |
ctc911ctc |
Feb 1 2020, 02:21 PM
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#3
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Senior Member Group: Members Posts: 917 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
To clarify - the quote you took supports your point of view. Installing a battery, wrench the positive and then negative. Removing power or battery - remove the negative.
For no other reason than you want to wrench the POSITIVE first so if you slip the wrench you are not then holding a filament. I disagree. I see lots of people disconnect the positive cable. If you do that, you risk sparks and/or a direct shorted battery if your wrench touches ANYTHING while disconnecting the cable. If you disconnect the negative first, the only possible way to short out your battery is to hit the positive post with the other end of the wrench. And if you keep a plastic post cover over it (or even just some painter's tape) you can't short out the battery. |
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