What's the best adjustable torque screwdriver? - Mike Holt's Forum

I know what you are saying, but keep in mind new to NEC is 110.14(D)View attachment

Sorry don't have any electronic version of yet and can't copy/paste from NFPA's free online access version, but can use snip tool to copy, which is slow process compared to copy paste.

"my' 'torque wrench' seems to be able to apply only about 65 in-# nowadays, it used to be able to hit 80 in-# hmy:

When an aircraft or military drawing calls out torque, it usually specifies 'traceable to NSIT' and a 6 month interval for testing.

At work, we can get a sticker applied to our personal test mechanical equipment if we like. QC guys came thru a few years back and ran about 15 guys dial calipers thru the testing with a NIST traceable standard. EVERYbodies depth indicator failed..

Was it the panel folks, or the screwdriver folks? :ashamed:

i meant 110.14

what was their thoughts to write that into that section?

from other chatter in other forums, it appears to boil down to "not enforceable" as there is no way to test that proper torq is or is not applied. the only thing i can see is that an AHJ can now say "see, 110.14, can i see the tool you used and the paperwork to prove it was calibrated" before the AHJ gives sign-off. but like i said, if the device specs are critical then a AHJ already should be doing that to make sure its "right" in terms of tool usage. serious calibrated tools carry serial numbers, so i would not expect an AHJ to be asking for such on non-crit items that have a torq spec because the field is not carrying tools that each have their own serial number and calibration docs.

but still nothing on how much tolerance is acceptable in the calibration.

Is clutch on a driver-drill consistent enough to give you same result every use? Will result vary if speed is different every time?

[FONT=Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif]TBD i guess. i would not expect this type of tool to be used on a critical junction point. i think the distinction is (will be) critical vs non-critical in terms of listing or install directions. if the directions call for specific torq using a tool within ±2 lb-ft then the tool needs to be that good and calibration doc is as close to a field test as the AHJ will get. recall the days when folks called in 3kpsi concrete and the truck had psi in it, so folks started using field testing apparatus to make sure the crete was the right stuff before it was dumped onto job site.[/FONT]

[FONT=Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif]i suspect 110.14 is not interrogated by AHJ unless the device (junction/fitting/whatever) is a critical thing and the device has listing that says so, or instructions say "must torq to 24 #-ft ±2".[/FONT]

[FONT=Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif]for craps & giggles, pool a few $$ together, but a wiha set, send it to a reputable calibration place and see how well they are to spec and/or setting. might even be able to get such place to do it for free if you know who/how to ask. a distribution and accuracy and precision #'s should suffice. [/FONT]

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