Hochiki Europe (UK) Limited
2-3-0-345/ISS7/OCT10
Hochiki Europe (UK) Limited
2-3-0-345/ISS7/OCT10
Notes
1.
The electrical circuit in the hazardous area must be capable of withstanding an a.c. test voltage of 500 volts to earth or
frame of the equipment, for a period of one minute without breakdown.
2.
The installation must comply with National requirements.
3.
The system must be marked with a durable label which should appear on or adjacent to the principal item of electrical
apparatus in the system or at the interface between the intrinsically safe and non-intrinsically safe circuits. This
marking shall include the word SYST or SYSTEM, for example “System No. BAS Ex 98D2264” or “BAS No. Ex
98D2264 SYST”.
A. Unspecified equipment except that no voltage shall exceed 250V with respect to earth.
B. EITHER:
Any BASEEFA Certified shunt safety Zener Diode Barrier with the following parameters:
30V or less
200mA
or
less
1W
or
less
The barrier earth must be connected via a high integrity connection, using an insulated conductor equivalent to a 4mm
2
copper
conductor, such that the impedance from the point of connection to the main power system earth is less than 1 ohm.
OR:
Any one channel from the following BASEEFA Certified Galvanic Isolators:
Type Number
Um=250V
I.S. Output
Certificate No.
MTL 3043
2-3
5/6-7/8
Ex86B2285
MTL 40612Channel
9-8 or 12-11
1/2-3 or 4/5-6
Ex94C2040
MTL 5061 2Channel
9-8 or 12-11
1/2-3 or 4/5-6
Ex96D2426
MTL5561 2 Channel
9-8 or 12-11
1/2-3 or 4/5-6
BASEEFA09ATEX0027
P&F KFD0-CS-Ex1.51
11-12
1-2
Ex96D2152
P&F KFD0-CS-Ex2.51
11-12 or 9-8/10
1-2 or 4-5
Ex96D2152
P&F KFD0-CS-Ex1.51P
11-12
1-2
Ex96D2152
P&F KFD0-CS-Ex2.51P
11-12 or 9-8/10
1-2 or 4-5
Ex96D2152
Note: Earthing requirements as described above for Zener Diode Barriers, is not required with Galvanic Isolators.
C. Up to 20 SLR-E-IS Intrinsically Safe Photoelectric Smoke Detectors complete with YBN-R/4 IS Bases, BASEEFA
Certificate
BAS01ATEX1281
OR:
Up to 20 DCD-1E-IS Intrinsically Safe Heat Detectors complete with YBN-R/4 IS Bases, BASEEFA
Certificate No
BAS01ATEX1021
OR:
A combination of each type to a maximum of 20 units.
D. End-of-line resistor. The end-of-line resistor must have a body surface area of 230mm
2
or more.
E. Optional Remote Indicator consisting of Light Emitting Diode (LED)
only. The LED must have a surface area of 230mm
2
or
more. The interconnecting cable to any Remote Indicator(s) is to be considered as part of the interconnecting cable described
at G below.
F. Optional interconnection for sharing a single Remote Indicator between any number of SLR-E-IS or
DCD-1E-IS/YBN-R4/IS Detector/Base combinations as shown above. The terminal 4 in each base may be interconnected as
shown at F above and a single Remote Indicator connected to any one such base. The interconnecting cable between any
terminals 4 and the wiring to any Remote Indicator is to be considered as part of the interconnecting cable described at G
below.
G. Interconnecting cable having the following maximum parameters:
Group
Capacitance
C
µF
Inductance
L
mH
Inductance to Resistance ratio
L/R
µH/ohm
IIC 0.07
0.62
36
IIB 0.56
1.86
146
IIA 1.82
4.96
286
H. Optional cable screen. If used, this must only be connected to earth within the safe area and must be isolated from the
electrical circuit and must be capable of withstanding an a.c. test voltage of 500 volts for a period of one minute without
breakdown.
J. Up to 20 optional devices, for example switches such as manual call points having appropriate BASEEFA Certification for
use in the intended hazardous environment (Hochiki part no. CCP-IS) or otherwise classified as simple apparatus according to
BS EN 60079-11:2007. Such devices may be fitted with a resistor in series with the switch and /or an end-of-line resistor as
per D above. Where such a resistor is used it must have a body surface area of 230mm
2
or more (typical resistance 470 - 680
ohm).
