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torque screwdriver #195108
07/12/10 05:00 PM
07/12/10 05:00 PM
Niko  Offline OP
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
I just purchased a new torque screw driver. And I tested my connections at a recent panel upgrade. It amazed me how under torqued my connections were, on the breakers, on the bus bars.

I like my new tool. From now on I am torquing all of my small screws.

it is a great little tool.




Be kind to your neighbor, he knows where you live

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Re: torque screwdriver [Re: Niko] #195109
07/12/10 05:39 PM
07/12/10 05:39 PM
L
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
How often are you going to get it calibrated? smile

Be careful about dropping it or banging it.

Does it click free at the setpoint or does it record maximum value?

Re: torque screwdriver [Re: LarryC] #195115
07/12/10 09:03 PM
07/12/10 09:03 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
Watch out for over-torquing: striped threads are no fun.

It has been my experience that the troops over-torque circuit breakers to the point of needing to replace the set screws or even the breaker. ( Manufacturers will not warranty field disassembled and re-fabricated breakers. )

I personally torque down all bussing at the MSB -- and subsequently Meg it out. Megging catches dropped fasteners.

When my troops screw up they never admit it, usually, so I have to verify everything.

----

Famously, years ago, a sloppy crew installed a MSB upgrade in quarters so tight that it had to be disassembled and constructed in place.

Six months later it blew-up in a complete arc blast: the boyz never properly torqued down the bussing. The customer recalled that it was really buzzing before it blew. Naturally, the EC was not called until it was a complete disaster.

So, yes, torque down the bus and breakers.


Tesla
Re: torque screwdriver [Re: LarryC] #195117
07/12/10 09:31 PM
07/12/10 09:31 PM
Niko  Offline OP
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
Originally Posted by LarryC
How often are you going to get it calibrated? smile

Does it click free at the setpoint or does it record maximum value?


I think the instruction said once a year for calibration.
It clicks once reached predetermined setting. its range is 20-70 in-LB


Be kind to your neighbor, he knows where you live


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