Page 227 - Electromechanical Devices and Components Illustrated Sourcebook

Chapter 10 Wire and Conductors 189

Service Heads Removable Cap

A service head is a specialized conduit fitting that is specifi- Service Head
cally designed to interface a building’s electrical system to the
power grid. Figure 10-70 shows a typical service head instal-
lation on a residential building. The head is typically mounted
to the end of a piece of galvanized rigid conduit. The conduit Power Cable
penetrates the roof and is connected to the building’s meter. Anchor
The power cable is attached to an anchor insulator which is Insulator
clamped to the conduit. The ground and power conductors are Rigid Conduit
routed up and through the service head. Weather Boot

Roof
Outlet and Switch Boxes

Figure 10-71 shows a selection of common switch and outlet
boxes that are commonly available on the market today.
Cover plates are as varied as the different devices to be
Figure 10-70 Service Head
mounted. Just a few of the more common cover plates are

Deep Drawn
Single Place
Blank
(Handy Box)
Switch

Knock Outs
Receptacle

Deep Drawn
Two Place
(Duplex Box)
Duplex
Receptacle

Folded Two Place
(Square Box)
Duplex
Receptacle

Eight Side
Deep Drawn
30-60 Amp Plate (Octagonal)

Figure 10-71 Outlet and Switch Boxes