Page 80 - Electrical Installation in Hazardous Area

56 Electrical installations in hazardous areas

d = extent from Table 3.2
Fig. 3.3 Extent of Zone 2 (relative density z 1.3)

d = extent from Table 3.2

Fig. 3.4 Extent of Zone 2 (relative density t0.7)

circumstances and these effects are shown in Fig. 3.5. When determining
the extent of a hazardous area in a particular case all of these effects need
to be taken into account.

Liquid releases

When a liquid which is released there is a further problem with the possi-
bility of the formation of liquid jets which can travel significant distances
before they strike the ground, and the formation of pools of liquid from
which vapour escapes when the liquid strikes the ground. For this reason,
it is preferable to place a baffle on the joint to prevent the formation of
jets and then to control the formation of any pool to limit the size of any
hazardous are a which results. This type of action will typically produce a