Page 259 - 35_DS702_E_2014_Lightning_Protection_Guide

protected
ATEX approvals: 1 1´ intrinsically safe
KEMA 06ATEX0274 X: equipment
II 2 (1) G Ex ia [ia Ga] 2 2´
IIC T4, T5, T6 Gb 1 1’
protected 2 BLITZDUCTOR XT 2’

IECEx approvals: 3 3’
DEK 11.0078X: 3 3´ 4 4’
Ex ia [ia Ga]
IIC T4, T5, T6 Gb 4 4´

circuit sample application
Figure 8.2.4.2 Intrinsically safe BXT ML4 BD EX 24 arrester

This component has an EC type examination certificate issued functions. The device is thus suited for protecting sig-
by KEMA (KEMA 06ATEX0274 X). nals from Ex zone 0. The equipment itself must not be
installed in Ex zone 0 (see Gb).
This classification means: IIC Explosion group – The SPD fulfils the requirements of
KEMA Symbol of the test institute explosion group IIC and may also be used with ignit-
06 First certification of the device in 2006 able gases such as hydrogen or acetylene.
ATEX ATEX generation T4 Between –40 °C and +80 °C
0274 Consecutive number of the test institute T5 Between –40 °C and +75 °C
X “X” – Special conditions must be observed to ensure T6 Between –40 °C and +60 °C
safe use. These can be found in section 17 of the EC Gb EPL Gb - Device with a “high” level of protection for
type examination certificate. explosive gas atmospheres which is not a source of ig-
nition during normal operation or in case of predicted
The surge protective device is classified as follows: faults / malfunctions.
II 2(1) G Ex ia [ia Ga] IIC T4…T6 Gb
Other important electrical data:
This classification means:
¨ Maximum external inductance (L 0 ) and maximum external
II Equipment group – The SPD may be used in all fields capacitance (C 0 ):
with the exception of mining. The special selection of components in BLITZDUCTOR XT
2(1) G Equipment category – The SPD may be installed in Ex means that the values of the internal inductance and ca-
zone 1 and also in installation circuits with conduc- pacitance of the various individual components are negligi-
tors coming from zone 0 (to protect terminal devices bly small (L i = 0; C i = 0).
in zone 0). Atmosphere: G = gas; D = dust. ¨ Maximum input current (I i ):
Ex The test institute certifies that this electrical equip- The maximum current which may be supplied via the con-
ment complies with the harmonised European stand- nection components without eliminating intrinsic safety is
ards IEC 60079-0 (EN 60079-0): General provisions 500 mA.
and IEC 60079-11:2011 (EN 60079-11:2012): Intrinsic ¨ Maximum input voltage (U i ):
safety “i”.
The maximum voltage which may be applied to BLITZ DUCTOR
ia Type of protection – The SPD can even handle a com- XT without eliminating intrinsic safety is 30 V.
bination of two arbitrary faults in an intrinsically safe
circuit without causing ignition itself. Unearthed Ex(i) circuits
[ia Ga] Type of protection ia and EPL Ga – Device with a “very The insulation between an intrinsically safe circuit and the
high” level of protection for explosive gas atmos- frame of the electrical equipment or other parts which can
pheres which is not a source of ignition during normal be earthed must typically be able to withstand the root mean
operation and in case of expected or rare faults / mal- square value of an a.c. test voltage which is twice as high as

258 LIGHTNING PROTECTION GUIDE www.dehn-international.com