Cable
Separations
The cables of the fire detection and alarm system and other systems should
usually be separated by at least 160mm, unless dedicated conduit or ducting
is being used.
In the UK there is additional guidance provided in a document reference
‘Recommended cable separations to achieve electromagnetic compatibility
in buildings’ obtainable from the Electrical Contractors Association.
Earth continuity
All earth connection points should be clean to provide a good electrical
conductivity path.
To maintain the earth continuity:
all earth leads and fittings provided should be installed
the loop cable screen must be continued through each system device on
the loop, whether the earth is connected to the device or not.
see also Cable termination.
NOTE: Do not use any part of building structure for earthing.
A zinc coating is provided around the termination point, on the inside of an
equipment metal enclosure. This provides a good electrical conductivity
path for cable earth termination.
CAUTION: The zinc coating should not be damaged. Any
damage will expose bare metal, which can corrode and make
poor earth connection.
There are copper fingers fitted to the control and indicating equipment to
fill the gap between enclosure and cover. The fingers provide a shield
against electromagnetic and radio frequency interferences.
CAUTION: It is important to avoid damage to the copper
fingers, as this can re-introduce gap between enclosure and
cover.
Mains Supply
The mains supply to mains operated equipment should enter the enclosure
by a dedicated entry, which is the closest to the mains connection points.
Cable
termination
Use only cable manufacturers recommendations for cable termination.
The wires between the termination point and terminals should be short and
as straight as possible.
Cable Separations
EMC Compliance
Senator II Installation Manual
2-2
78910-03NM Issue 2_10/96