The Ideal Scene: Professionally Made Commercial Cables - Lighting Controls Blue Box LT Series Installation, Operation & Maintenance Manual

32 THE BLUE BOX LT MAKING UP CAT. 5 CABLE WITH RJ45 CONNECTORS
CABLE AND CRIMPING qUALITY (Continued)
Stranded wire does not fatigue as easily and break . Solid
wire is usually used as "building wire . " The reason being
that it used to be cheaper and is not usually flexed after
it has been installed . LC&D only recommends the use of
stranded Cat . 5 wire .
The three types of wire have three types of crimps
(Figures 1 . 5 a & 1 . 5 b show an RJ45 connector and three
cable crimp types):
Contacts for Stranded wires
Contacts for Solid/Stranded wires
Contacts for Solid wires .
Stranded Only Solid / Stranded
(Note: It is very important that the correct crimps/
contacts are used for the right wire! The contacts that
mate with the wires have different shapes for the different
types of wire) .
THE IDEAL SCENE: PROFESSIONALLY MADE
COMMERCIAL CABLES
Common attributes of commercially made cables include:
a)
b)
c)
Figure 1 . 6 illustrates an example of a commercial cable .
Take note of the injection molded strain relief . This pre-
vents
ment of the connec-
tor from the cable
to ensure the cable
Figure 1.5a
crimp stays engaged .
Solid Only
Figure 1.5b
They always use stranded cable .
The pneumatically crimped connectors have per-
fectly flat contacts .
The strain reliefs are usually injection molded .
any move-
Figure 1.6