17a02loop

MX
EQUIPMENT:
17A-02-LOOP
PUBLICATION:
8 7/07
ISSUE No. & DATE:

MX DIGITAL LOOP – LOADING CALCULATION
FOR INSTALLATIONS TO BS5839 : PART 1
Note: MKII 801IB Isolator bases are distinguished from
1. INTRODUCTION
MKI 801IB Isolator bases by a ‘**’ on the product
label.
This document specifies the loop loading parameters
applicable to each device that can be connected to the MX
Digital Loop. It provides a method of assessing that the 3. LOOP LOADING
loading of each loop remains within safe operating limits for
The maximum number of addressable units that can be
specified installation cables. It also provides guidance on the
connected to a loop is 250.
use of short-circuit line isolators and a method of calculating
the number required for a given loop configuration.
The permissible loading on a loop is determined by both the
DC current drawn from the line and also by the attenuation of
Only cables that are in common use in the UK and countries
the AC communications signal that each device introduces.
working to BS 5839 : Part 1, cables used in shipboard
systems and installations using common continental FD
In order to simplify the calculations, each device has been
cable are covered. For other types of cable, please contact
allocated both AC and DC loading values expressed as DC and
the Tyco Safety Products Help Desk at Sunbury.
AC units respectively. Table 1 gives values for currently
available loop devices.
Note: Loop loading parameters are subject to change
as improvements are made and new devices For each loop the AC loading must not exceed 250 AC units.
introduced. Please ensure that the latest issue This has been calculated on the basis of maximum cable length
of the document is used when calculating loop of standard fire resistant cable and assumes a line fault has
loading. occurred to leave a full-length spur of cable. Refer to Section 4
of this document when using MICC or other high capacitance
2. SHORT-CIRCUIT ISOLATORS cables. The AC loading limit can be increased by 10 AC units
for every 100m less than the maximum cable length specified.
The 5BI 5” Isolator base, 801IB Isolator base, LI800 Line
Isolator Module, LIM800 Line Isolator Module and those The DC loading for systems fitted with FIM/XLMs must not
devices that have built-in isolators, provide the means by exceed 1,200 DC units per loop, a maximum of 4,400 DC units
which the MX Digital Loop can be protected against per controller or 8,800 units per MX2 controller.
accidental short-circuits. It is recommended, that, in line
The DC loading for enhanced loop operation fitted with FIM
with the requirement of BS5839: Part1, Line Isolators are
Mod 7 or later, refer to TIB0438, must not exceed 2,200 DC
used to limit the number of devices that can be lost as a result
units per loop (including the current consumed by the FIM).
of a short-circuit.
For each controller, a maximum of 4,400 DC units per
There is a maximum limit to the number of devices that can PSB800/PSB820 or 8,800 per PSB821 installed is available.
be connected between two Line Isolators. Table 2 gives the The maximum limit per PSB800/PSB820/PSB821 must not be
loading value for each loop device in terms of IB units. A exceeded as this would lead to loops shutting down due to
maximum of 32 IB units is allowed between two MKI 801IB power supply limitations. Refer to the Alarm Load Calculation
Isolator bases. Sheet.
However, all other Line Isolators allow 100 IB units to be A second PSB800/PSB820 can be fitted by using the
connected between two isolators. This allows at least 32 PSB800K/PSB820K Kit which includes the PSB800 and all
devices between isolators unless a large number of RIM800 necessary accessories and leads.
or Sounder Base modules are also connected (if in doubt,
refer to Table 1).
Note: The maximum DC loading calculation allows for 5
loop devices with remote LEDs in alarm and two
In establishing the number and location of Line Isolators
operated short-circuit isolators.
used in a loop, the requirement of BS5839: Part 1 should be
first considered. Each isolated section of the loop should then
801IB = 14mA (2 x 7mA)
be checked to ensure that the maximum number of IB units
5BI = 20mA (2 x 10mA)
has not been exceeded. Where necessary, additional Line
LI800 = 5mA (2 x 2.5mA)
Isolators should be introduced.
LIM800 = 20mA (2 x 10mA)
The allowable AC loading limits the maximum number of Loop devices with built-in isolators:
Line Isolators that can be used in a loop. Refer to Section 3 (with Isolator indication LED) = 20mA (2 x 10mA)
for Loop Loading calculation. (without Isolation indicator LED) = 12mA (2 x 6mA)

© 2007 Tyco Safety Products PAGE 1 of 11
Registered Company: Thorn Security Ltd. Registered Office: Dunhams Lane Letchworth Garden City Hertfordshire SG6 1BE

MX
17A-02-LOOP
8 7/07
Load Between Line
dc Loading ac Loading
Device Type Isolators
(dc units) (ac units)
(IB units)
MX Detectors
801PH/813P*** 1 1 1.2
801CH*** 1 1 1
801I*** 1 1 1.4
801H*** 1 1 1
801F*** 1.2 1 7
801PC*** 1.2 2 1
S271f+ 2 2 2
SAM800 1 1 1
SAB800 48 1 2.5
SAB801 15 1 2.5
MX Functional Bases
801IB 0.5 0.1 N/A
5BI 0.3 0.2 N/A
801RB 0.4 0.3 1.6
801SB Full Volume 60 2.4 2.5
801SB Medium Volume 48 2.4 2.5
801SB Low Volume 36 2.4 2.5
802SB Full Volume 27.2 0.5 2.5
802SB Low Volume 4.8 0.5 2.5
812SB No Volume Control 96 0.5 2.5
901SB Full Volume 0** 0.5 2.5
901SB Low Volume 0** 0.5 2.5
912SB No Volume Control 0** 0.5 2.5
Symphoni Sounder Low Volume 13.6 1 N/A (built-in isolator)
Symphoni Sounder High Volume 32.4 1 N/A (built-in isolator)
Symphoni Sounder Beacon Slow Flash + Low Volume 26 1 N/A (built-in isolator)
Symphoni Sounder Beacon Fast Flash + Low Volume 30.4 1 N/A (built-in isolator)
Symphoni Sounder Beacon Slow Flash + High Volume 44.4 1 N/A (built-in isolator)
Symphoni Sounder Beacon Fast Flash + High Volume 52 1 N/A (built-in isolator)
MX Callpoints
CP820*** 1.1 1 1.5
CP830*** 1.1 1 1.5
MX Ancillaries
LI800 0.6 0.1 N/A
LIM800 0.4 0.2 N/A
MIM800 1.1 1 1.5
CIM800 1 1 1
DIM800 (Class A) 2.2 1 1
DIM800 (Class B) 1 1 1
RIM800 1.2 1 5
HVR800 0.7 0 N/A
SNM800 1.5 1 5
LPS800 * 1.5 1
APM800 2.3 1 1
SIO800 1 1 5
BDM800 140 1 2
VLC800 1.2 2 1
MIO800 1.6 1.2 4
TSM800 1.7 1.2 N/A (built-in isolator)
* See Section 3.1.
** Externally powered by 24V dc supply
*** And variants unless otherwise listed

Table. 1

PAGE 2 of 11

MX
EQUIPMENT:
PUBLICATION:
17A-02-LOOP
ISSUE No. & DATE:
8 7/07
Load Between Line
Device Type Isolators
(IB units)
MX Intrinsically Safe Devices
EXI800 12 # N/A
P&F Isolator 24 # N/A
801PHEx 1 # N/A
801CHEx 1 # N/A
801HEx 1 # N/A
801FEx/811FEx 1.2 # N/A
CP840Ex 1 # N/A
IF800Ex 1 # N/A
S271i+ 3 # N/A
# AC loading of Intrinsically Safe devices is measured in IS units, please refer to document 17A-02-ISLOOP
MX Intrinsically Safe System - Loading Calculation
Table. 1

Max. Total Distance = Max Distance = Max Distance = Max
Alarm Loop Cable size distance LPS Cable size distance LPS Cable size distance LPS
Current from Panel from Panel from Panel
1.5mm2 2.5mm2 0.8mm2
150mA 2km, 2km, 730m
(24 ohm/km) 48 ohms (15 ohm/km) 30 ohms (73 ohm/km) 54 ohms
1.5mm2 2.5mm2 0.8mm2
200mA 1.7km, 2km, 540m
1.5mm2 2.5mm2 0.8mm2
300mA 1.1km, 1.8km, 360m
1.5mm2 2.5mm2 0.8mm2
400mA 0.8km, 1.2km, 270m
1.5mm2 2.5mm2 0.8mm2
500mA 0.7km, 1.1km, 220m
Table. 2 Loop Distance Table when using LPS800

3.2 LPS800 LOOP POWERED SOUNDER
3.1 LOOP POWERED SOUNDER
MODULE LOOP LOADING
MODULES (LPS800)
CONSIDERATIONS
The LPS800 may drive up to a 75mA output load. The
LPS800 takes 4mA plus its output load current, however, If the sounder devices connected to the LPS800 have an
for the loop loading calculation the minimum current shall o p e r a t i n g r a n g e d o w n t o 1 2 V, t h e n n o s p e c i a l
be 12mA. considerations need to be addressed. If the sounder devices
connected to the LPS800 have an operating range down to
For example, if the load on the LPS800 is 6mA, the total
18V (such as the 24V LF BANSHEE and 24V Flashni),
DC loop current in the active state, from this device is 4mA
then special consideration must be taken based on loop
+ 6mA=10mA. Since this is less than the minimum of
current and loop line length.
12mA, 12mA should be used as the dc loading of the
device. If the LPS800 load current is 50mA, the dc load For Table 2, Class B Loop wiring,
value used should be 54mA. distance = maximum distance an LPS800 can be placed
from the panel, other devices can be placed as per MX
To calculate the number of DC units of load imposed on the
Loop specification.
loop by the LPS800 (for use in the Table on page 2), use the
DC current calculated above and multiply by 4. For For Class A Loop wiring, distance = maximum distance an
example, the LPS800 from above with the 6mA load would LPS800 can be placed from the panel using a worse case
calculate to be 48 DC units (12mA x 4) and the LPS800 single break. If an LPS800 is near the panel on the B-side,
with the 50mA load would calculate to be 216 DC unit load then a break at the A-side at panel is worst case; in this case
on the loop (54 x 4). line length = total loop length.
This applies to version 1.3 firmware and greater or for
firmware prior to version 1.3 when the digital loops are
wired in a spur configuration.


MX
17A-02-LOOP
8 7/07

4. CABLE TYPE AND CABLE Cable
Cable type
LENGTH length
MICC 2L1.5, 2L2.5, 1H1,5, 2H2.5 1.8 km*
4.1 GENERAL
Steel Wire Armour (SWA) 1.8 km*
Cable requirements for all parts of the system are discussed
Fire resistant ‘foil and drain wire’,
in Publication 17A-03-I/C, which should be referred to
2 km
eg, FP200, Lifeline, Firetuff
before installation is carried out. All cables should be
installed to meet the requirements of BS5839 Part 1 BS6883 marine cable 2 km
Subsection 26 or local equivalent standard. Continental FD cable 0.8mm 2 km
For addressable circuit wiring, any type of screened or
Table. 3
unscreened cable that would normally be used on fire
* Up to 2km of these cables may be used on condition that
protection systems may be used in an MX Digital
the maximum AC loading is restricted to less than 220 AC
Loop. Thus MICC, drain wire type fire resistant and SWA
units per loop (refer to Section 3).
cables with a minimum 1.5mm 2 and maximum 2.5mm 2
conductor size may all be used.
4.4 CABLE SCREEN
For marine applications, 2-core or 4-core ethylene propylene
rubber EPR insulation and chloro-sulphanated polyethylene The MX controller uses a floating power supply and
(CSP) sheath to BS6883 with a conductor size of 1.5mm2 is provides monitoring for earth leakage faults. It is, therefore,
important to ensure that the MX Digital Loop remains
to be used.
isolated from earth structures.
Continental FD cables with a minimum of 0.6mm and a
maximum of 0.8mm diameter conductor size may be used. The MX Digital Loop will operate satisfactorily with
unscreened cables. However, where cable with a conductive
screen or outer metal sheath is used this must not be
connected to the MX Digital Loop.
Note: It is an IEE Regulation that fire alarm system
cables be segregated from (non-fire alarm Where cable with a conductive screen is used, it is
system) cables. recommended that the screens from each section of cable be
joined within each device to form a continuous cable screen.
4.2 CABLE TYPES
5. VOLTAGE DROP
The MX Digital Loop may be wired using MICC, SWA
(using a suitable termination gland) or any of the following The MX Digital Loop is designed to operate with a
‘foil and drain wire type’ fire resistant cable (terminated minimum DC voltage of 20V. An even distribution of
devices and alarm load along the length of cable will ensure
with an SHV or CTX type gland):
that the maximum voltage drop remains within acceptable
DÄTWYLER: Lifeline
limits.
DELTA: Firetuff
Where a single high alarm load, such as several fully loaded
FABRICA CAVICEL: Firecell
LPS800 units connected to one point in the loop, is
HUBER&SUHNER: Radox FR
envisaged, it is important that the maximum volt drop
PIRELLI: FP range created by this load is less than 14.4V.
DRAKA CALFLEX: Calflam
This should be calculated using the highest resistance path to
RAYDEX: FG950
the high load, which will be a combination of cable
GEC AEI: Firetec resistance and resistance introduced by the Line Isolators.
TRATOS CAVI: Firesafe
For all calculations on voltage drop due to cabling a spur
ALCATEL: Pyrolyon
condition should be assumed, ie, the system must operate
Continental FD cable 0.6mm: eg, JY(St)Y n x 2 x 0.6 with a single break leaving a maximum cable length.
Continental FD cable 0.8mm: eg, JY(St)Y v x 2 x 0.8
The following values should be used:
Cable size Resistance
4.3 CABLE LENGTH 1.5mm2 24 ohm/km*
2.5mm2
The maximum length of cable that can be used on an MX 15 ohm/km*
Digital Loop depends on the characteristics of the cable such 0.6mm 130 ohm/km*
as its parallel capacitance and series resistance. Tests have
0.8mm 73 ohm/km*
been conducted to establish the performance of the MX
Line Isolators 0.25 ohm/unit
Digital Loop with a typical high capacitance and low
resistance cable using MICC L1.5 and with a lower
* The resistance given is for both conductors.
capacitance cable like the Dätwyler Lifeline. Table 3 gives
guidelines for these and similar cables:

PAGE 4 of 11

MX
EQUIPMENT:
PUBLICATION:
17A-02-LOOP
ISSUE No. & DATE:
8 7/07

8. CALCULATION SHEETS
6. BATTERY CHARGING
Pages 6 to 11 contain the AC/DC loading, loading between
Line Isolators and Battery and Alarm Load calculation
Charging Standby Current Charger Current*
sheets which may be photocopied.
Capacity Voltage (Amps) (Amps)
2.5 2.0
When calculating the battery Alarm Load for a given
2.0 2.4
system, adequate provision needs to be made for likely
27.4V dc 1.5 2.7
10 - 38Ah
@ 20°C 1.0 3.1 system expansion. If in doubt, the figure for the maximum
0.5 3.4
alarm load should be used.
0.0 3.8
Table. 4a PSB800/PSM800/PSB820
JM/an
Charging Standby Current Charger Current*
Capacity Voltage (Amps) (Amps)
12th July 2007
27.3V dc
65Ah 1.5 3.0
@ 20°C
27.3V dc
10 - 38Ah 2.5 2.0
@ 20°C
Table. 4b PSB821

* Average current until battery is restored to 80% capacity.
The charging current available from the PSB800/PSB820/
PSB821 is reduced as the standby current increases in
accordance with Table 4.

7. BATTERY OUTPUT
In the case of mains failure, batteries will provide the
outputs shown in Table 5.

Battery Standby Time
24 hours 72 hours
38Ah 1400mA + 1Amp 450mA + 1Amp
Alarm @30 mins Alarm @30 mins
17Ah 625mA + 1Amp 200mA + 1Amp
Alarm @30 mins Alarm @30 mins

Table. 5a PSB800/PSM800/PSB820

Battery Standby Time
24 hours 72 hours
65Ah 2350mA + 2 Amps 780mA + 2 Amps
Alarm @ 30 mins Alarm @ 30 mins
38Ah 1400mA + 1Amp 450mA + 1Amp
Alarm @ 30 mins Alarm @30 mins
17Ah 625mA + 1Amp 200mA + 1Amp
Alarm @ 30 mins Alarm @30 mins

Table. 5b PSB821


MX
17A-02-LOOP
8 7/07
LOOP LOADING CALCULATION SHEET PER LOOP
Device Type
dc units Qty Total ac units Qty Total
MX Detectors
801PH/813P*** 1 1
801CH*** 1 1
801I*** 1 1
801H*** 1 1
801F*** 1.2 1
801PC*** 1.2 1
S271f+ 2 2
SAM800 1 1
SAB800 48 1
SAB801 15 1
MX Functional Bases
801IB 0.5 0.1
5BI 0.3 0.2
801RB 0.4 0.3
801SB Full Volume 60 2.4
801SB Medium Volume 48 2.4
801SB Low Volume 36 2.4
802SB Full Volume 27.2 0.5
802SB Low Volume 4.8 0.5
812SB No volume Control 96 0.5
901SB Full Volume 0 0.5
901SB Low Volume 0 0.5
912SB No Volume Control 0 0.5
Symphoni Sounder Low Volume 13.6 1
Symphoni Sounder High Volume 32.4 1
MX Intrinsically Safe Devices
Symphoni Sounder Beacon Slow Flash + Low Volume 26 1
Device Type dc units ac units
Symphoni Sounder Beacon Fast Flash + Low Volume 30.4 1
EXI800 12 #
Symphoni Sounder Beacon Slow Flash + High Volume 44.4 1
P&F Isolator 24 #
Symphoni Sounder Beacon Fast Flash + High Volume 52 1
801PHEx 1 #
MX Callpoints
801CHEx 1 #
CP820*** 1.1 1
801HEx 1 #
CP830*** 1.1 1
801FEx/811FEx 1.2 #
MX Ancillaries
CP840Ex 1 #
LI800 0.6 0.1
IF800Ex 1 #
LIM800 0.4 0.2
S271i+ 3 #
MIM800 1.1 1
CIM800 1 1
DIM800 (Class A) 2.2 1
DIM800 (Class B) 1 1
RIM800 1.2 1
HVR800 0.7 0 * See Section 3.1
SNM800 1.5 1
** Must not exceed 4400 DC units per
LPS800 * 1.5
PSB800/PSB820 or 8,800 DC units per
APM800 2.3 1
PSB821
SIO800 1 1
*** And variants unless otherwise
BDM800 140 1
stated
VLC800 1.2 2
# For systems with both hazardous and
MIO800 1.6 1.2
non-hazardous areas, the AC (IS) units
TSM800 1.7 1.2
must be calculated first. A conversion
Standing DC Loading 220
factor can then be used to determine the
number of spare AC units available for
Total AC (IS#) Units
the non-hazardous area of the MX
loop.
Refer to Publication 17A-02-ISLOOP.
Existing loop operation Total DC units Total AC units
(1 x PSB) (1,200 max) (250 max)

Enhanced loop operation Total DC units Total AC units
(2 x PSB) (2,200 max)** (250 max)
PAGE 6 of 11

LOADING BETWEEN LINE ISOLATORS
Device IB Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section 9 Section 10
Type Units Qty Total Qty Total Qty Total Qty Total Qty Total Qty Total Qty Total Qty Total Qty Total Qty Total
MX Detectors
801PH/813P* 1.2
801CH* 1
801I* 1.4
801H* 1
801F* 7
801PC* 1
SAM800 1
SAB800 2.5

© 2007 Tyco Safety Products
SAB801 2.5
S271f+ 2
MX Functional Bases
801RB 1.6
801SB Full Volume 2.5
801SB Medium Volume 2.5
801SB Low Volume 2.5
812SB 2.5
912SB 2.5
MX Callpoints
CP820* 1.5
CP830* 1.5
MX Ancillaries
MIM800 1.5
CIM800 1
DIM800 1
RIM800 5
HVR800 N/A
SNM800 5
LPS800 1
APM800 1
SIO800 5
BDM800 2
VLC800 1
MIO800 4

Total IB Units per section (100 max):
* And variants unless otherwise stated

PAGE 7 of 11

BATTERY CALCULATION SHEET
Normal Loads Alarm Loads
Notes/Rating
mA Qty Total mA Qty No. Loops Total
CONTROL EQUIPMENT
FIM801 + CPU Loop loading included 123 172 195 244
FIM802 + CPU Loop loading included 172 244
XLM800 104 105
PSB800 90 90
PSM800 65 65
PSM820/PSB820 90 90
PSB821 90 105
AC Repeater (OCM + ODM + PSM) 91 316
OCM800 (5V dc power) 11 22
ODM800 (Driven from OCM800) AC fault Backlight off 14 14
DCM800 (5V dc power) used on MX2 23 252
MPM800 (5V dc power) 10 19
MPM800 (5V dc power) with isolated RS485 22 30
ANN840 (5V dc), may require MPM 800 20 LEDs on 1 23
ANN880 (5V dc), may require MPM 800 20 LEDs on 1 23
ANN881 (5V dc power) used on MX2 1 23
COM820 (5V dc), may require MPM 800 5 LEDs 1 6
IOB800 29 208‡
XIOM16 LEDs, MPM800 (5Vdc) per 5 units 16 LEDs on 47 47
XIOM 16 inputs, MPM800 (5Vdc) per 5 units 16 inputs active 24 24
XIOM 16 relay, MPM800 (5Vdc) per units 16 relays on 1603 1603
MIMIC 80 add MPM800 (5Vdc) per unit 20 LEDs on 37 37
PRN800 52 52
TLI800 127 127
SIM800 2 2
LOOP DEVICES
800 detectors and ancillaries Alarm Indicator Load: 55mA x No. of Loops* 55
801IB alarm load is tripped 0.03 0.03
5BI 0.15 0.15
LI800 0.03 0.03
LIM800 0.15 0.15
801CH# 0.41 0.41
801CHEx 0.55 0.55
801F# 0.546 0.546
801FEx# 0.546 0.546
801H# 0.33 0.33
801HEx 0.52 0.52
801I# 0.49 0.49
801PH/813P# 0.41 0.41
801PHEx 0.63 0.63
801PC# 0.64 0.64
S271f+ 0.91 0.91
S271i+ 1.365 1.365
801RIL 0 8.23
801HL 0.0 9.1
CIM800 0.46 0.46
MIM800 w/o remote LED 0.5 0.5
MIM800 w/remote LED 0.5 0.5
RIM800 0.53 0.53
SAB800 0.33 21.84
SAB801 0.33 6.83
SAM800 0.33 0.33
SNM800 0.69 0.69
DIM800 (Class A) 0.98 0.98
DIM800 (Class B) 0.46 0.46
APM800 5A @ 24V dc 0.51 1.06
Callpoint 0.46 0.46
BDM800 with Fireray 2000 28 42
BDM800 with Fireray 50R/100R 9.5 29.5
SIO800 0.46 0.46
CP840Ex 0.55 0.55
IF800Ex 0.6 0.6
801RB 0.2 0.3
801SB Full volume 0.08 25
802SB Full volume 0.465 12.38
812SB Only one volume setting 0.465 38.22
Symphoni Sounder Full Volume 0.82 14.75
Symphoni Sounder Beacon Fast Flash, Full Volume 0.82 23.66
EXI800 5.5 5.5
P&F Isolator 11.0 11.0
LPS800 ** 1.24 ***
VLC800 0.546 0.546
MIO800 0.71 0.71
HVR800 (when using control input) 0 0.33
TSM800 0.77 0.77

Total Total

Continued overleaf

PAGE 8 of 11

MX
EQUIPMENT:
PUBLICATION:
17A-02-LOOP
ISSUE No. & DATE:
8 7/07

Total from previous page
24V LOADS
PSM800 AC supply off 65 65
PSB800 AC supply off 90 90
PSM820/PSB820 AC supply off 90 90
PSB821 AC supply off 90 105
RSM800 6
MPM800 (24V dc power), 1 per 80 points 15 28
MPM800 (24V dc power), 1 per 80 points, with
34 47
isolated RS485
OCM800 (24V dc power) 35 81
ODM800 (24V dc power) may require MPM800 Backlight on 14 230
ANN840 (24V dc power) may require MPM800 20 LEDs on 0.8 35
ANN880 (24V dc power) may require MPM800 20LEDs on 0.8 35
COM820 (24V dc power) may require MPM800 5 LEDs on 0.8 9
XIOM 16 inputs, MPM800 (24Vdc) per 5 units 16 inputs active 25 25
XIOM 16 LEDs, MPM800 (24Vdc) per 5 units 16 LEDs on 49 49
XIOM 16 relay, MPM800 (24Vdc) per 5 units 16 relays on 1605 1605
MIMIC 80, MPM800 (24Vdc) per unit 20 LEDs 39 39
PRN800 52 52
DIM800 (current per Class A spur) Not including detector load 8.25 50
DIM800 (current per Class B Spur) Not including detector load 14 50
DC Repeater (ODM800 + OCM800 + RSM800) 46 279
IOB800 29 208‡
200mA @ 24V dc
LCD Repeater (with RS232-RS422 Converter)
Remotely powered
901SB 0.46 6.8
912SB 0.46 24
601SB 0.46 6.8
SB520 15A @ 24V dc 85
HVR800 (used with RIM800 or MIO800) 10A @ 250V ac 16
APM800 5A @ 24V dc 5.4 7
SNM800 2A @ 24V dc 1.4 1.4†
BELL 0 55
BANSHEE 0 17
BEDLAM 0 30
WESTERMO Modem 72 72
OTHER LOADS

Total (2.5A max)= Total (5A max)=
x x
Alarm Hours
Standby Hours
Standby Capacity = Alarm Capacity x 1.2 =
Total Capacity = Standby +
The Maximum charger load is either
Alarm =
maximum Normal or Alarm which ever is the greatest
Divide by 1000 =
Multiply by battery
factor (1.25)= Ah

(*/**/***/†/‡/#) See Notes
* The maximum number of detectors and /or ancillaries that can indicate an alarm and /or operated state at any one time
is 5 per loop. This assumes the worst case of 5 detectors plus RILs.
** See Section 3.1.
*** The alarm load can be calculated by the following expression: Alarm load (mA) = (4 + LPS800 output load current
x 1.82).
† Sounder load to be added.
‡ All relays operated.
# And variants unless otherwise listed


MX
17A-02-LOOP
8 7/07

ALARM POWER SUPPLY CALCULATION SHEET
40V Load 24V Load 5V Load
Notes/Rating mA Qty Total mA Qty Total mA Qty Total
CONTROL EQUIPMENT
FIM801 + CPU 25 1 25 100 1 100 184 1 184
FIM802 + CPU 50 100 194
XLM800 50 2 40
PSB800 90
PSM800 65
PSM820/PSB820 90
PSB821 105
AC Repeater (ODM800 + OCM800 + PSM800) Backlight on 65 941
OCM800 (5V dc power) - - 81
ODM800 (Driven from OCM800) - - 860
DCM800 (5V dc power) used on MX2 942
MPM800 (5V dc power) - - 73
ANN840 (5V dc power) may require MPM800 - - 85
ANN880 (5V dc power) may require MPM800 - - 85
ANN881 (5V dc power) used on MX2 85
COM820 (5V dc power) may require MPM800 - - 21
IOB800 (5V dc power w/MPM800) - - 35
XIOM (5V dc) 16 LEDs O/Ps configured 177**
XIOM (5V dc) 16 inputs active 91**
XIOM (5V dc) 16 relays active 11**
80-Way Mimic (25% LEDs) 140
TLI800 120 25
PRN800 52
SIM800 8
LOOP DEVICES
Loop #1 unit load 0.25 #
24V LOADS
PSM800 AC supply off - 65 -
PSB800 AC supply off 90
PSM820/PSB820 AC supply off 90
PSB821 AC supply off 105
DC Repeater c/o OCM, ODM, RSM800 Backlight on 279
RSM800 6
MPM800 (24V dc power) - 30 -
OCM800 (24V dc power) - 81 -
ODM800 (24V dc power) may require MPM800 Backlight on - 239
ANN840 (24V dc power) may require MPM800 25% of LEDs in alarm - 35 -
ANN880 (24V dc power) may require MPM800 25% of LEDs in alarm - 35 -
COM820 (24V dc power) may require MPM800 25% of LEDs in alarm - 9 -
DIM800 (Class A) Not including detector load - 50 -
DIM800 (Class B) Not including detector load 100
HVR800 10A @ 250V ac - -
APM800 5A @ 24V dc - 7 -
IOB800 (24V dc power with MPM800) - 200
XIOM 16 LEDs O/Ps configured 49**
XIOM (24V dc) 16 inputs active 25**
XIOM (24V dc) 16 relays active 1605**
80-Way Mimic (25% LEDs) 39
SB520 15A @ 24V dc - -
SNM800 2A @ 24V dc - 1.4‡ -
RIM800 2A @ 24V dc -
901SB 6.8
912SB 24
601SB 6.8
BELL - 55 -
BANSHEE - 17 -
BEDLAM - 30 -
WESTERMO Modem 72
OTHER LOADS

Note: Total (†)= Total (5.0A max)= Total (2.2A max)=
x x x x
1) The maximum 40V load for a 4-loop MX controller is 4400 DC
1.85x 0.267
1
units or 1.1A.
2) The maximum 40V load for a 8-loop MX2 controller is 8800 40V load = 24V load = 5V load =
DC units or 2.2A

PAGE 10 of 11

MX
EQUIPMENT:
PUBLICATION:
17A-02-LOOP
ISSUE No. & DATE:
8 7/07

# = Total DC units from Loop Loading Calculation Sheet. 40V load =
† The total 40V load allowed is 1.2A per PSB800/PSB820 fitted or 2.4A per PSB821 fitted. +24V load =
‡ Sounder load to be added. +5V load =
** Requires MPM800 to drive this device. Divide by 1000 =

Total 24V dc load =
Not to exceed 5.0 Amps total


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