Basic Electrical Installation Work

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Two pieces metal joined bolt and nut and machine screw and nut are shown Fig. Where pos- sible, the parts riveted should clamped and drilled together with a clearance hole for the rivet. release the broken- off stem piece, the nose bush turned upwards and the handles opened sharply.33. 14. 14. The stem the rivet pushed into the nose bush the riveter until the alloy sleeve the rivet flush with the nose bush (a). Special rivets are used with hand tool, shown Fig. rivet permanent fastening since the parts riveted together cannot easily separated. (a) (b) . A nut and bolt joint may considered temporary fastening since the parts can easily separated required unscrewing the nut and removing the bolt. Thin sheet material such trunking often joined using pop riveter.Electrical installations and wiring systems 321 Joining materials Plastic can joined with appropriate solvent. The nut tightened secure the joint. The stem will fall out and discarded (d). The alloy sleeve compressed and the rivet stem will break off when the rivet set and the joint complete (c). Bolt and nut Machine screw and nut FIGURE 14. The rivet then placed the hole and the handles squeezed together (b). Metals may welded, brazed soldered, but the most popular method on-site joining met- als electrical installations nuts and bolts rivets. (c) (d) FIGURE 14. 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.34.34 Metal joining with pop rivets.33 Joining metals