thuba PS 830, Руководство пользователя, Страница: 13 / 72

Manual BVS 19 ATEX E 080 X 9
Edition March 2020 thuba Ltd., CH-4002 Basel
Copyright Switzerland
5 Cable glands must have a protection class
greater than IP54.
6 If the Ex pzc-housing has surface made of
synthetics (e.g. windows) with an area
greater than 100 cm², than a warning sign
against electro static discharge is neces-
sary.
Caution ! Danger of static discharge. Clean
only with humid cloth!
7 There is no danger of static discharge, if the
synthetic surface has a thickness of ≤ 0,2
mm (Group IIC) respectively 2 mm (Group
IIB) or less and it is mounted on a metallic
ground.
8 If the Ex pzc-housing posses internal com-
partments the installer has to obey the fol-
lowing rules:
a) Components with a free internal volume
less than 20 cm³ are not considered to
be internal compartments requiring
purging as long as the total volume of all
such components is not more than 1%
of the free internal volume of the pres-
surized apparatus. (IEC 60079-2; Abs.
5.5.4)
b) Provide not less than 1 cm² of vent area
for each 1000 cm³, with a minimum vent
size of 6,3 mm diameter should be allow
for adequate purging. (IEC 60079-2;
Abs. 5.5.2)
c) Place the vents in a diagonal order, as
shown on the picture below, with a min-
imum vent size of 6,3 mm diameter
drillings