ETC Matrix MkII Rack - Manual (Page 17)

Installing Data Cables
13
5
Section 4
Installing Load Cables
Terminations
Terminals for the load wiring are located to the left of the rack at the rear and are accessible when the
rear door is opened. The terminals for 3kW circuits are arranged in groups of three (L, N, E)
corresponding to the number of channels in each row (3 modules) of the cabinet. Terminals for 5kW
and 12kW circuits are located in pairs with the earth terminals located separately but adjacent to the L
and N terminals. The load terminals are wired in groups for each row of modules. Load wires may be
stripped to bare ends or (better) stripped and fitted with crimp ferrules before insertion into the
terminal blocks.
Load terminal sizes
Up to 3kW circuits:6mm
2
[AWG 12]
5kW circuits: 10mm 2 [AWG 8]
12kW circuits: 16mm
2
[AWG 4]
Routing load cables
When drawing load cables into the
rack, ensure that no insulation is
damaged by edges of trunking or
access apertures. If the wiring has
been pre-designated and includes
temporary labelling to identify circuit
numbers, be careful not to dislodge
labels during the wiring process.
Dress and terminate the wires neatly
and avoid leaving extra wire or
discarded sleeving in the rack. The
horizontal bars behind each tray are
perforated to accommodate cable ties
for this purpose. Load wiring should
not place any strain on the terminal.
In the diagram right, the load cables
(a) enter from the bottom of the rack
and are neatly clipped to the
horizontal tie bars on the rear of each
shelf (b). They are dressed in bunches
according to the location of the load
terminals (c). Care should be taken
when routing the load cables so they
do not obstruct the load terminal
screws. Data cables (d) are similarly
routed and clipped to the trays.
Load wiring should not cross between
racks; they should only enter the rack
in which they are terminated. Live and
neutral load wiring must follow the
same path for each circuit and should
remain in pairs to the appropriate
terminals.
CAUTION
Load circuit neutral must be
terminated in the same
module position as its paired
live conductor to avoid RCD
or RCBO nuisance tripping.”