Technical Documentation: Fire Detectors used in hazardous areas
P-DET/EX/RCE/PM5/GKa/110995 9 Autronica Fire and Security AS
1.3 Labelling electrical equipment
Electrical equipment intended for use in hazardous area, shall be properly
labelled in accordance with claims brought forward by national or international
authorities.
The label shall, according to, e.g. EN-50020, contain the symbol Ex, the form
of protection (see table page 7, Abbreviation) e.g. "i", gas group (see table
page 8) e.g. "IIB", and eventually the class of temperature e.g. "T3". This is
true if the maximum ambient temperature is diverging from + 40°C.
The label also shall show the name or logo of test- and approving institution
and test approval statement.
For small electrical equipment, with limited space, reduced labelling may be
accepted.
The label shall then include:
The symbol Ex, name of Test institution (test approval), and Manufacturer.
Description: Labelling code:
Approval sign for apparatus certified by
an institution within the European Common
Market, EC: Ex EEx i a/b IIB T3
Sign indicating that the equipment is produced
according to The European Norm (EN)
EEx means: "Explosion protection to
European standards"
Intrinsically safe performance; ia or ib (see page 6)
ia: withstands 2 faults with safety factor = 1
or 1 fault with safety factor = 1,5
ib: withstands 1 fault with safety factor = 1,5
or 1 fault with safety factor = 1
and no unprotected conductor
Group: IIA, IIB or IIC (see page 8)
Temperature class: T1, T2, T3, T4, T5 or T6
(see page 8)
This example is made according to the
CENELEC norm.
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