Wiring
Wiring
Electrical connection terminals are located on the top and bottom of the back side of
the ITS Test Block. The connection terminals accept ring cable lugs and spade cable
lugs. Use the included special phillips cross recessed pan head screws (UNC thread).
The screws are magnetic and can be mounted with power screwdrivers (fastening
torque 1.2 Nm).
Do not use metric or other improper screws or warranty will be void.
Recommended wire gauge is from 1,5 mm
2
(AWG 16) to 4 mm
2
(AWG 12).
CTs should be wired to the terminals provided for this purpose (in 2- or 4-pole com-
binations) to ensure automatic short circuiting upon insertion of STP Test Plugs or
individual test probes into the ITS Test Block. The terminals designated for the con-
nection of the CTs can be typically identified by the C- -C or C- -C- -C- -C
labeling
In addition to the two rows of labeling in the front, the ITS Test Block has one row of
labels each on the top, back and bottom side (when installed horizontally). All ”poles”
(or test block modules) are continuously numbered in the same way as it done on the
front of the test block (e.g. from 1 through 20 for a 20-pole test block). Pole number
1 (as seen from the front) is also numbered 1 when seen from the back side.
Each ”pole” (or test block module) hast two connection terminals that receive the
same number as the pole itself. One label on each the top side and the bottom side
of the test block (when installed horizontally) indicate with the letter ”a” or ”b” if the
terminals on that side are associated with the ”A-SIDE” (system side), or ”B-SIDE”
(device side).
1
custom labeling may show other symbols or use other colors.
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