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ID61/62 Series Panel - Installation, Commissioning & Configuration Manual
EN 54-2 : 12.5.2
Maximum of 32
Sensors and/or MCPs
between isolators.
BS5839 Part 1
Use OPAL-protocol
compatible MCPs on
OPAL or mixed protocol
loops to meet the 3 second
response
NEVER use a high
voltage tester on
the loop.
997-457-000-8, Issue 8
January 2010
4.8 Sensors and Modules
Each of these devices is packaged with an instruction
leaflet showing the correct interconnections for various
applications. OPAL Protocol devices are now supported.
To include the internal isolator (not all OPAL devices
incorporate these) use the new B501 AP sensor base
which has an additional positive leg loop wiring connector
for the device's internal isolator.
4.8.1 EN54 Requirements
Isolators
Isolators must be used on the analogue loop to separate
sensors and/or MCPs, including any conventional zone
detectors and/or MCPs connected.
To comply with the requirements of EN54-2, isolators
should be fitted between a maximum of 32 loop devices
not fitted with internal isolators (this does not include CLIP
devices; only OPAL protocol devices may have this
feature. For this panel, do not place more than 25 loop
devices between isolators (20 if FET isolators are used).
Failure to comply contravenes the requirements of
EN54-2 in the event of a transmission path fault.
4.8.2 BS5839 Part 1 Requirements
All MCPs should be OPAL protocol compatible on OPAL
or mixed OPAL and CLIP protocol loops
Note: CLIP MCPs may be installed but the panel may
time.
4.8.3 Loop Wiring Testing
Before connecting the panel or devices, the wiring of the
loop may be tested for continuity and insulation. Once
any components are connected, including isolators or
devices with internal isolators, no high-voltage testers
such as Meggers may be used on the loop; low-voltage
testers such as multimeters may be used.
Note: If isolators or devices with an internal isolator are
34
not to meet the 3 second response time required
by BS5839 Part 1. If CLIP MCPs are used the
maximum number of these MUST be 6 to allow all
CLIP devices to have been polled in 3 seconds.
fitted, the +ve conductor of the loop will be open
circuit.
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