Terminal blocks with smaller pin spacing may also used for internal connections, provided they meet the requirements laid out Table 5
(see below).
The exact clearances and creepage distances well separation distances based Table must derived from the application items
cited above.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 6.1 6.2.1 “Terminal blocks.13, accordance with the alternative procedure for dimensioning isolation distances given
in Annex F.41
www.
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 6.1
Note:
The dimensions indicated here represent
the clearances and creepage distances
around the insulation and not the thickness
of the insulation.” 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.2.3.
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.
Dimensions mm
.2 “Connect-
ing point for external circuits,” Section 6.3.wago.”
Outside:
a)
Isolated intrinsically safe circuits: least mm
All PCB terminal blocks listed the ordering pages suitable for “i” applications fulfill these requirements
