TLS Magnetostrictive Probes International Installation Guide Surge Protector Kits
8
Surge Protector Kits
When required, a surge arrestor must conform to Clause 12 of IEC/EN 60079-25 and must be installed in
accordance with the requirements for surge protection devices defined in Clause 12.3 of standard IEC/EN
60079-14 as follows:
1. Surge protection is required between each conductor of the cable including the screen and the structure
where the conductor is not already bonded to the structure.
2. The surge protection device shall be capable of diverting a minimum peak discharge current of 10 kA (8/20 us
impulse according to IEC 60060-1 for 10 operations).
3. The connection between the protection device and the local structure shall have a minimum cross-sectional
area equivalent to 4mm
2
copper.
4. The cable between the intrinsically safe apparatus in Zone 0 and the surge protection device shall be installed
in such a way that it is protected from lightning.
5. Any surge protection device introduced into an intrinsically safe circuit shall be suitably explosion protected for
its intended location.
6. The use of surge protection devices which interconnect the circuit and the structure via nonlinear devices
such as gas discharge tubes and semiconductors is not considered to adversely affect the intrinsic safety of a
circuit, provided that in normal operation the current through the device is less than 10 uA.
For example, the two surge arrestors below, supplied by Gilbarco/Veeder-Root, are examples that comply with the
above requirements per the manufacturers declaration of conformity.
Figure 5. Surge Protector Kit For Wired Installations - Dual Channel Surge Protector BA-350 Or Equivalent
Overvoltage arrestor
Terminal blocks
External connection (PA)
Ground wire
connection clamp
031-12
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