10
Using bolt and nut
(see Figures 6.2)
If using this method, use one of the
larger holes with diameter of
0.205’‘ (5.2 mm)
The bolt and nut size should be
No.8 (0.164’‘ diameter (4.16 mm)),
or No.10 (0.190’‘ diameter (4.83
mm)) or M5 (0.197’‘ diameter (5.0
mm)).
Star washers must be used to make
contact through the anodization of
the module for this method.
In this case, the screw threads are
not providing the electrical ground
contact.
Recommended torque value in
tightening bolt and nut is 2.3 N.m
(20in-lb).
Using cup washers
(see Figures 6.2)
• The use of cup washers is to prevent
wire from slipping out from under the
screw head (and/or the flat washer).
• Make sure that the cup washer is
placed between the wire and the module
frame.
• Choose an adequate size for the cup
washer and the flat washer so that the
wire is fully clamped between them.
• Note: Cup washers are also called ter-
minal cup washers.
• The cup washers should be stainless
steel, or a cup washer made of brass may
be used only if a large flat washer made
of stainless steel is inserted between the
module frame and the cup washer.
• Choose the adequate size for the large
flat washer (between the module frame
and the cup washer) so that the cup
washer doesn’t contact the module
frame and is fixed stably to the module
frame.
Note: Use the ground holes
illustrated in Figure 6.1.
*If using a brass cup washer, a
flat washer must be inserted
between the cup washer and
module frame, and the flat
washer diameter must be
greater than the cup washer
Figure 6.2
Using bolt and nut
