N93-572-88 Issue 12 NH Page 9 of 52 © Protec Fire Detection plc 2020
4.0 6100 Cabling Requirements
4.1 General
All wiring associated with the system must conform to the current I.E.E Regulations, and cabling
must conform to the relevant BS specifications. ECA recommended cable separation for
electromagnetic compatibility in buildings must be followed.
Where screened cables are used it is important to ensure that screen continuity is maintained
between cable segments. Any screen wiring in the panel enclosure must be sleeved and securely
bonded to the earth points provided.
For further information on cables, wiring and other interconnections please consult clause 26 of
BS 5839 Part 1 : 2017 ( or any document superseding it ).
4.2 Mains Input Rating Label
The mains rating label is located on the inner door of the 6100 and should be consulted before
starting installation. The label details the working voltage, frequency and maximum current of the
6100.
4.3 Mains Wiring
The 6100 requires a mains supply exclusive to the panel that uses fixed three-core wiring
( between 0.75mm
2
and 2.5mm
2
) which is fed from a double pole isolating fused spur, fused at 3A.
Unauthorised operation of the mains supply must not be allowed and the fused spur should be labelled
“ FIRE ALARM PANEL: DO NOT SWITCH OFF ”.
Mains wiring must be segregated from all other system wiring. The wiring clamp must
be used to secure the incoming cables.
4.4 Alarm Circuit Wiring
Two alarm circuits are provided which are always driven simultaneously. Each alarm output can
provide 100mA of current and must be terminated with the correct value end of line resistor, even if
the alarm output is not used.
The gauge of the alarm circuit wiring must be chosen such that the volt drop along the wiring does
not exceed specified limits. The maximum wiring resistance may be calculated using the following
formula.
R
wiring_max
= ( 20.5 – V
device min
) / ( I
device max
)
Where R
wiring_max
is the maximum resistance of the alarm circuit wiring ( both conductors )
V
device min
is the minimum Voltage the alarm circuit devices are specified to work down to
I
device max
is the maximum total current that will be drawn on the alarm circuit
For example if alarm devices are specified to work to a minimum of 16V and the maximum alarm
circuit current is 80mA, the maximum alarm cable resistance is 56.25Ω ( 28.13Ω per conductor ).
To achieve an enhanced drive capability of 200mA it is permitted to connect both alarm circuits in
parallel, in which case the end of line resistor must be reduced. Please see section 10.0 for end of
line values.
Devices connected to the alarm circuits must be polarised and suppressed.
Alarm devices must not be connected on spurs from the main alarm circuit wiring
as a spur will not be monitored for open circuit faults.
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