I don't think impact drivers should be used at all, unless they have a
way to adjust torque. Instead, use a drill/ driver with torque setting
set fairly low, and do a final tightening with a torque wrench. Also,
you need to be really careful what speed you use; even with low torque,
the screws can start binding from over heating, if driven too fast.
Ray Walters
Remote Solar
303 505-8760
On 9/4/21 12:08 PM, Jerry Shafer wrote:
Wrenches
its not the tool its the user so when I hear about impacts got to know
the feel.
Jerry
On Fri, Sep 3, 2021 at 12:06 AM Corey Shalanski <coreso...@gmail.com
<mailto:coreso...@gmail.com>> wrote:
Wrenches,
(This question actually does refer to the proper use of 'wrenches'...)
While inspecting some recent work from one of our contractors, we
noted that the PV module clamps had been torqued to ~150% of the
racking manufacturer's specified value. My question is whether
that might have any detrimental effect on the modules (frame,
glass, cells, seal, etc) and whether it would be worth loosening
the clamps and re-torquing them to the proper spec? For reference,
224 modules are installed.
We were made aware that the contractor used an impact driver on
the clamps, which accounts for the excessive torque applied. I
definitely understand the temptation to use an impact driver
for just about any hardware that needs turning—but my
understanding is also that impact drivers are generally
incompatible with machine screws. So my other question to the
group is whether anyone has had success in dissuading
subcontractors from using impact drivers so liberally on project
sites? Any advice is appreciated.
--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
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