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Certification Manual
Chapter 2: Construction Considerations
and Techniques
Structural Considerations
When running wire and installing components, structural
considerations must be taken into account. Does the facility have a flat
roof or a pitched roof? Does it have an attic with ample room? Does it
have suspended ceilings? If so, is it an air plenum? If not, is there room to
conceal the device boxes what type of wall construction is it? Brick or
concrete? Wood or steel studs? The answers to these questions will
determine how you pull your wire, what kind of wire is needed, what kinds
of wall boxes to use and whether or not you can run wire inside the wall or
have to use external chases such as “wiremold” or “panduit.” Other
factors include firewalls and smoke walls. While smoke walls are almost
exclusively found in attics, Figure 2: Types of Construction Materials
firewalls can be both above
Material
Product
Uses
and below the ceiling. In fact,
Wood & Wood
Studs, Floors,
hallway walls are considered Lumber
Products
Decking,
firewalls.
Special
Rafters, Doors
consideration needs to be
Sheetrock, Plaster
Wall Finishing
taken penetrating a firewall Gypsum
when pulling wire in an attic Masonry
Brick, Concrete
Floors, Interior
Block
and
Cement
and Exterior
or suspended ceiling. Any
Walls, Ceilings
penetration must be caulked
Light and Heavy
Headers, Studs
with fire-stop caulk after the Metal
Gauge Steel
and Exteriors
pull is finished. This helps
Light to Medium
Doors and
prevent fire from transferring
Gauge Aluminum
Windows
from one section of the
building to another if a fire should occur. This is very important in our
installations.
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