Cable Glands; Cable Connections - E2S GNEXS1DC024 Instruction Manual

11) Earthing
Both AC and DC sounder units must be connected to a good
quality earth. The units are provided with external earthing
terminals which are both located on the terminal chamber
section of the unit (see figures 2 and 3).
When using the external earth terminal a cable crimp lug
must be used. The cable lug should be located between the
two M4 stainless steel flat washers. The M4 stainless steel
spring washer must be fixed between the outer flat washer
and the M4 stainless steel nut to ensure that the cable lug is
secured against loosening and twisting.

12) Cable Glands

The GNExS2 and GNExS2 sounders have dual cable gland
entries which have an M20 x1.5 entry thread as standard.
Only cable glands approved for Ex 'd' applications can be
used, which must be suitable for the type of cable being used
and also meet the requirements of the Ex 'd' flameproof
installation standards EN 60079-14:2008 / IEC60079-
14:2007.
SAFETY WARNING: If temperature exceeds 70ºC at entry or
80ºC at branching point use suitably rated cable and cable
glands.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable gland.
When only one cable entry is used the other one must be
closed with an Ex 'd' flameproof blanking plug, which must be
suitably approved for the installation requirements.

13) Cable Connections

The cable connections are made into the terminal blocks on
the electronic PCB assembly located in the flameproof
enclosure. See section 8 of this manual for access to the
flameproof enclosure.
On the AC units an eight way terminal block is provided for
the live (x2) , neutral (x2) & earth mains supply wires and
also common (C) linking the second (S2) and third (S3)
stages, (see figures 5 and 6).
On the DC units a six way terminal block is provided for +ve
(x2) and –ve (x2) supply input and second (S2) and third (S3)
stage modes of operation, (see figures 4 and 7).
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Figure 3
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GNExS2 DC Sounder
A single wire with a cross sectional area of up to 4mm² can
be connected to each terminal way or if an input and output
wire is required two 2.5mm² wires can be connected to each
terminal way. When connecting wires to the terminals great
care should be taken to dress the wire so that when the cover
is inserted into the chamber the wires do not exert excess
pressure on the terminal blocks. This is particularly important
when using cables with large cross sectional areas such as
2.5mm² and above.
GNExS2 AC Sounder
GNExS1 AC Sounder
DIP Switches
Volume Control
DC Terminals
Stage
Headers
Figure 4
DIP Switches
Volume Control
AC Terminals
Figure 5
DIP Switches
AC Terminals
Volume
Control
Figure 6