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US adoption rate for Aex approvals

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Fieldbus

Electrical
Jun 30, 2006
12
GB
Does anyone know any US plants that have adopted Zones for hazardour location approvals?
For hazardous areas in Europe and RoW, plants are usually classified into Zones (0/1/2) to IEC standards, whereas in the US, plants are classified into Div1/Div2 to NEC500.
The latest update to the NEC adds NEC505 which allows the use of Zones, but it seems to be mutually exclusive - the whole plant is either Zones or Divisions.
 
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