© 2003 Tyco Safety Products PAGE 3 of 8
I.S. SYSTEM 800
17A-13-S
11/03
EQUIPMENT:
PUBLICATION:
ISSUE No. & DATE:
Registered Office: First Floor North Building Walden CourtParsonage Lane Bishops Stortford Herts CM23 5DB
SYSTEM 800 - INTRINSICALLY SAFE MX ADDRESSABLE
FIRE DETECTION SYSTEM
SERVICE AND MAINTENANCE INSTRUCTIONS
1. GENERAL
The following work must be carried out by Thorn Security
Limited Service Engineers or suitably trained personnel.
WARNING:
ALL MAINTENANCE PRACTICES EMPLOYED
MUST, IN ADDITION TO THOSE STATED HERE,
MEET THE SAFETY AND INSPECTION
REQUIREMENTS SPECIFIED IN THE
MAINTENANCE SECTION OF EN BS 60079-14.
ALL ELECTRICAL EQUIPMENT, INCLUDING
MEASURING INSTRUMENTS, USED
IN THE HAZARDOUS AREA MUST FIRST BE
ACCEPTABLE TO THE CUSTOMER’S SAFETY
OFFICER.
THERE IS A POSSIBILITY THAT THE NATURE OF
THE HAZARD HAS CHANGED OR BEEN CHANGED
SINCE THE LAST SERVICING. THE SYSTEM
DOCUMENTATION SHOULD BE CHECKED BEFORE
ANY SERVICING IS PERFORMED. IF DURING
SERVICING A RISK IS FOUND, WHICH IS NOT
COVERED OR DOCUMENTED, ACTION MUST BE
TAKEN IN ACCORDANCE WITH EN BS 60079-14 TO
RECTIFY THE SITUATION.
ANY WORK CARRIED OUT ON DETECTION OR
SOUNDER CIRCUITS MUST COMPLY WITH THE
REQUIREMENTS OF 17A-13-I,
INSTALLATION INSTRUCTIONS.
2. CERTIFICATION REQUIREMENTS
The Intrinsically Safe systems used for the protection of low
voltage fire detection systems produced by Thorn Security
Limited have been certified category ‘ia’ by the British
Approvals Service for Electrical Equipment in Flammable
Atmospheres (BASEEFA).
•System 800 (BASEEFA*****) can be used for
a Gas Group IIC hazard in a Zone 0, Zone 1 or
Zone 2 environment.
•Sounder System (BASEEFA Ex872028) can be
used for a Gas Group IIC hazard in a Zone 0,
Zone 1 or Zone 2 environment.
For information on Gas Groups and Zones refer to publication
26A-01-G1, Use of Electrical Equipment in Fire Detection and
Extinguishing Systems for the Protection of Hazardous Areas.
For information concerning the equipment which can be used in
the systems refer to 17A-13-I, Installation Instructions.
3. QUARTERLY / HALF YEARLY
SERVICE
WARNING:
NO DEVICES LIKELY TO CAUSE/CONTAIN A
SPARK OR FLAME MUST BE USED TO TEST
DETECTORS IN THE HAZARDOUS AREA.
All service and maintenance must be carried out in accordance
with the ‘Routine Inspections’procedures detailed in EN BS
60079-14. In addition the following must be carried out.
a) Ensure that all devices in the Hazardous Area
still meet the certification requirements for the
type of risk concerned.
b) Check that all detection devices and sounders
in the Hazardous area and the zener barriers/
isolating I.S. interface units inside the I.S.
interface housing are asspecified (refer to 17A-
13-I, Installation Instructions).
c) Carry out the service procedures for the type of
control equipment used. Where sounders are
sited in the Hazardous Area, check that a
sounder circuit fault is raised when:
i) The 24V d.c. supply is disconnected at the
sounder interface, or
ii) the sounder EOL device is disconnected at
the sounder interface.
Where apparatus is removed for maintenance, any exposed
conductors which remain in position must be mechanically and
electrically secured in an appropriate manner so as to prevent
the occurrence of an unsafe condition.
If it is known that a Safety Barrier has been subjected to an
excessive voltage or current, it should be removed from service
and returned to the service branch.
