Page 37 - Electrical Installation in Hazardous Area

16 Electrical installations in hazardous areas

Ex - explosion protected equipment
96 - the last two digits of the year of issue
D - amendment status of the Standard used for certification
2 - principal method of protection

1 = flameproof or pressurized (see Chapters 10 and 11)
2 = intrinsic safety (see Chapter 13)
3 = increased safety (see Chapter 12)
4 = type N (n) apparatus (see Chapter 14)
5 = special protection (apparatus which does not wholly comply
with one of the Standards but is considered as suitable)
6 = battery operated vehicles (usually using more than one type
of protection)
7 = oil immersed or powder filled (see Chapter 9)
123 = serial number of certificate within year
X = indicates that there are special (unusual) installation condi-
tions associated with the equipment and these will be speci-
fied on the certificate. If U appears instead of X or no suffix,
it means that the equipment is considered to be a component
and cannot be used unless incorporated in other equipment
and further certified

Protection coding

This normally appears in the following form:
EEx d IIC T4
The meaning of these symbols is as follows:

E - indicates that the equipment complies with a European Standard.
The symbol will not be present if such is not the case.
Ex - indicates explosion protected equipment
d - indicates the type of protection used

o = oil immersion (see Chapter 9)
p = pressurization (see Chapter 11)
q = powder filling (see Chapter 9)
d = flameproof enclosure (see Chapter 10)
e = increased safety (see Chapter 12)
i = intrinsic safety (see Chapter 13) (Intrinsic safety usually
appears with a further suffix, for example ia or ib)
m = encapsulation (see Chapter 9)
n = type n equipment (See Chapter 14); (n sometimes appears as