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General Technical Information
13 on Electrical Equipment Used in Hazardous Areas (continued)
620
Inside
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Outside
Non-
Intrinsically safe circuit Intrinsically safe circuit intrinsically safe circuit
Legend:
1 Cover: non-conductive or conductive and grounded
2 Partition based on 6.2.1 b); in this example, the partition must end at the base or be glued to the base
T Distances based on Table 5
d1 ≥ 3 mm, when the cover is conductive and grounded
d2 ≥ 6 mm
d3 ≥ 50 mm or d4 ≤ 1.5 mm
Note:
The dimensions indicated here represent the clearance distances around the insulation and not the thickness of the insulation!
Figure 1b: Example of isolation of intrisically safe and non-intrinsically safe terminal blocks by a partition
Table 5: Clearances and Creepage Distances and Isolation Spacing
1 2 3 4 5 6 7
Voltage Clearance Separation by Separation by Creepage distance Creepage distance Comparative track-
(peak) encapsulation fixed insulation through air beneath protective ing index (CTI)
V mm mm mm mm layer mm
Protection level ia, ib ic ia, ib ic ia, ib ic ia, ib ic ia, ib ic ia ib, ic
10 1.5 0.4 0.5 0.2 0.5 0.2 1.5 1.0 0.5 0.3 --
30 2.0 0.8 0.7 0.2 0.5 0.2 2.0 1.3 0.7 0.3 100 100
60 3.0 0.8 1.0 0.3 0.5 0.3 3.0 1.9 1.0 0.6 100 100
90 4.0 0.8 1.3 0.3 0.7 0.3 4.0 2.1 1.3 0.6 100 100
190 5.0 1.5 1.7 0.6 0.8 0.6 8.0 2.5 2.6 1.1 175 175
375 6.0 2.5 2.0 0.6 1.0 0.6 10.0 4.0 3.3 1.7 175 175
550 7.0 4.0 2.4 0.8 1.2 0.8 15.0 6.3 5.0 2.4 275 175
750 8.0 5.0 2.7 0.9 1.4 0.9 18.0 10.0 6.0 2.9 275 175
1000 10.0 7.0 3.3 1.1 1.7 1.1 25.0 12.5 8.3 4.0 275 175
1300 14.0 8.0 4.6 1.7 2.3 1.7 36.0 13.0 12.0 5.8 275 175
1575 16.0 10.0 5.3 * 2.7 * 49.0 15.0 16.3 * 275 175
3.3k * 18.0 9.0 * 4.5 * * 32.0 * * * *
4.7k * 22.0 12.0 * 6.0 * * 50.0 * * * *
9.5k * 45.0 20.0 * 10.0 * * 100.0 * * * *
15.6k * 70.0 33.0 * 16.5 * * 150.0 * * * *
Note 1 * At present, no values have been recommended for these voltages.
Note 2 Proof of fulfillment of the CTI requirements for the insulating materials must be provided by the manufacturer. Defining of a CTI is not required for insulating
materials for voltage levels up to 10 V.
