The stem will fall out and discarded (d). When
joining trunking cable trays, round head machine screw should be
used with the head inside reduce the risk damage cables being
drawn into the trunking tray.34. rivet permanent fastening since the parts riveted
together cannot easily separated. 14. The nut tightened secure the joint.33. release the broken-
off stem piece, the nose bush turned upwards and the handles opened
sharply. The rivet then placed the hole and the handles squeezed
together (b).
Bolt and nut Machine screw and nut
FIGURE 14.
Thin sheet material such trunking often joined using pop riveter.Electrical installations and wiring systems
321
Joining materials
Plastic can joined with appropriate solvent.
Special rivets are used with hand tool, shown Fig.33
Joining metals. Where pos-
sible, the parts riveted should clamped and drilled together with
a clearance hole for the rivet. Metals may welded,
brazed soldered, but the most popular method on-site joining met-
als electrical installations nuts and bolts rivets. 14.34
Metal joining with pop rivets.
(a) (b)
.
(c) (d)
FIGURE 14.
Two pieces metal joined bolt and nut and machine screw and
nut are shown Fig. The alloy sleeve compressed and the rivet stem will break
off when the rivet set and the joint complete (c).
A nut and bolt joint may considered temporary fastening since
the parts can easily separated required unscrewing the nut and
removing the bolt. The stem the rivet pushed into the nose
bush the riveter until the alloy sleeve the rivet flush with the nose
bush (a)
