1 Areas on an open deck, or semi-enclosed spaces
on an open deck, within a vertical cylinder of unlimited height and
6 m radius centred upon the centre of the outlet, and within a hemisphere
of 6 m radius below the outlet which permit the flow of large volumes
of vapour, air or inert gas mixtures during loading/discharging/ballasting
are defined as Zone 1.
Permitted electrical equipment: Certified safe type equipment
for Zone 1.
2 Areas within 4 m beyond the zone specified in
paragraph 1 above are defined as Zone 2.
Permitted electrical equipment:
-
.1 certified safe type equipment for Zone 1;
-
.2 equipment of a type which ensures the absence
of sparks, arcs and of "hot spots" during its normal operation;
-
.3 equipment having an enclosure filled with a
liquid dielectric, when required by the application, or encapsulated;
-
.4 pressured equipment; and
-
.5 equipment specifically designed for Zone 2
(for example type "n" protection in accordance with IEC 60079-15).