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<p>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. <br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 9/4/21 12:08 PM, Jerry Shafer wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMUFgmX4_3KTaTRg122WBbKyuvxq6xZ4Uh+YnVdbGP-OTA5uTw@mail.gmail.com">
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<div dir="ltr">Wrenches
<div>its not the tool its the user so when I hear about impacts
got to know the feel.</div>
<div>Jerry</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Sep 3, 2021 at 12:06
AM Corey Shalanski <<a href="mailto:coresolar@gmail.com"
moz-do-not-send="true">coresolar@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Wrenches,
<div><br>
</div>
<div>(This question actually does refer to the proper use of
'wrenches'...)</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>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\u2014but 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.</div>
<div><br>
</div>
<div>--</div>
<div>Corey Shalanski</div>
<div>Jah Light Solar</div>
<div>Portland, Jamaica</div>
</div>
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