Man-1112 Sigma XT+_23 Page 14 of 52
5. Connecting to the circuit boards
All connections for field wiring are to rows of terminals along the top and bottom of the circuit boards.
Shielded fire alarm cable such as FP200 and metal cable glands must be used for all connections to the panel.
The shield of the cable must be bonded securely to the enclosure earth via a metal cable gland.
The resistance of any core of any cable must not exceed 25 ohms. The shield of the cable must be bonded
securely to the enclosure via the metal gland.
Wiring should enter the enclosure at the top or back of the panel using the knockouts provided and be formed
tidily to the appropriate terminals ensuring that no cables are run close (minimum 50mm) to the surface of any of
the circuit boards.
Route mains cables away from all other cables and segregate by 50mm.
Terminals are capable of accepting wires of up to 2.5mm
2
.
Wiring must not go across the front of the circuit boards. If cable entries need to be in positions other than at the
knockouts provided, wiring must be fed behind and well away from the surface of the circuit board.
The space at the bottom of the enclosure is largely occupied by the standby batteries so this must be borne in
mind when considering cable entries.
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