Figure 1a: Requirements for clearances and creepage distances for terminal blocks with isolated, intrinsically safe cir-
cuits
Legend:
1 Conductive cover
T Distances based Table 5
d Distance outer connecting parts
of the terminal blocks according to
6.wago.”
Outside:
a)
Isolated intrinsically safe circuits: least mm
All PCB terminal blocks listed the ordering pages suitable for “i” applications fulfill these requirements.3.2.
Dimensions mm
.1 “Terminal blocks.
Terminal blocks with smaller pin spacing may also used for internal connections, provided they meet the requirements laid out Table 5
(see below).2.
b)
Intrinsically safe circuits and normal circuits (non-intrinsically safe): mm
Inside:
a) “i” “i”
b) “i” normal circuits
c) “i” ground
Based Figure and Table (see next page) accordance with the selected protection level and the special requirements for isolation dis-
tances described Sections 6.13, accordance with the alternative procedure for dimensioning isolation distances given
in Annex F.1
Note:
The dimensions indicated here represent
the clearances and creepage distances
around the insulation and not the thickness
of the insulation.
The exact clearances and creepage distances well separation distances based Table must derived from the application items
cited above.1 6.” general, the following can stated for terminal blocks based figure 1:
“Example isolated intrinsically safe terminal blocks with partition” conjunction with figure “Example isolation conductive parts,”
considering Table “Clearances, Creepage and Isolation Distances.com
> 6
1
≥ 3
1
1
d 3
T
WAGO Rail-Mount Terminal Block Systems
Technical Information for Applications
Requirements pertaining the necessary distances appropriate for use the terminal blocks the area DIN 60079-11 (VDE 0170-7)
“Explosive atmosphere Part 11: Device protection intrinsically safe features “i” (IEC 60079-11)” are defined under Section 6.41
www.2 “Connect-
ing point for external circuits,” Section 6.3
