I have been looking over the internal arrangement of a panel that will be mounted in a Zone 2 environment.
The IS & Non-IS terminals are >50mm apart but the IS wiring is routed to the galvanic isolators in the same trunking as the 24VDC non-IS power supply. The wires within the trunking are insulated but do not have a screen. I have flagged this as a conflict only to get the response that the separation only needs to 0.5mm (in accordance to table 5 in IEC60079-11 section 6.3.12 internal wiring).
Previously we required 50mm between IS & non-IS circuits with IS wiring installed in dedicated trunking within the panel.
Does this conflict with the statement in IEC60079-14 § 16.2.2.5.2 or is the 'intermediate layer of insulating material' the same as described in Table 5 mentioned above?
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