32 THE BLUE BOX LT MAKING UP CAT. 5 CABLE WITH RJ45 CONNECTORS
LCDBBMUCAT03Sept08
THE IDEAL SCENE: PROFESSIONALLY MADE
COMMERCIAL CABLES
Common attributes of commercially made cables include:
They always use stranded cable.a)
The pneumatically crimped connectors have per-b)
fectly flat contacts.
The strain reliefs are usually injection molded.c)
Figure 1.6 illustrates an example of a commercial cable.
Take note of the injection molded strain relief. This pre-
vents any move-
ment of the connec-
tor from the cable
to ensure the cable
crimp stays engaged.
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 1.5a & 1.5b show an RJ45 connector and three
cable crimp types):
Contacts for Stranded wires
C
ontacts
for Solid/Stranded wires
C
ontacts
for Solid wires.
(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).
CABLE AND CRIMPING qUALITY (Continued)
Figure 1.6
Figure 1.5a
Figure 1.5b
Stranded Only Solid / Stranded Solid Only
To Next Page
Loading...
Need help?
General