Scame ZENITH-P Installation, Utilisation Et Entretien page 20

ZENITH-P
5. CREEPAGE AND CLEARANCES
Terminals are rail or back plate mounted.
Back plate mounted terminal blocks (eg. BK, MK) shall be fixed with a minimum of two screws.
Creepage and clearance distances shall be in accordance with IEC / EN 60079-7.
Figure 6 – Details of creepage and clearance distances and mounting of metallic cable gland
(*) Note: Minimum clearance distances that shall be maintained to conductive parts or other live parts are:
Minimum clearance
250 V
400 V
500 V
630 V
800 V
1000 V
Table 6 – Clearance
Note: Voltages are nominal voltages – the working voltage may exceed by 10% the voltage level given.
5.1 NOTES EX-i CIRCUITS
Where Ex-i circuits are present, Ex-i terminals shall be blue and/or supplied with a suitable identification label.
If Ex-i circuits and NOT Ex-i circuits are present, Ex-i terminals and NOT Ex-i terminals shall be separated by one of the following
methods:
• When separation is accomplished by distance, then the clearance between terminals shall be at last 50mm. Care shall be
applied in the layout of terminals and in the wiring method used so that contact between circuits is unlikely if a wire become
dislodged.
• When separation is accomplished by use of un insulating partition or earthed metal partition, the partitions used shall extend
to within 1,5mm of the walls of the enclosure, or alternatively provide a minimum distance of 50mm between the terminals
when taken in any direction around the partition.
When separate intrinsically safe circuits are present, the clearance distance between bare conducting parts of external connection
facilities shall meet the following:
• at least 6 mm between the separate intrinsically safe circuits
• at least 3 mm from earthed parts.
MP39690
5 mm
6 mm
8 mm
10 mm
12 mm
14 mm
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Earth Continuity Plate
ZP91043-3