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Connectwell
terminal blocks are standard terminal blocks for industry specially
for Switchgear, Distribution, Machine Tools Control, Instrumentation
installations, Material Handling Equipments, Process Plants On and
Offshore Installations and Panel Board Construction.
Rated
Voltage
The
voltage rating of the product is assigned in accordance with
specifications related to Creepage and Clearance distance defined in
respective EN, VDE, UL and
CSA
standards, for the environmental conditions and pollution degree as
given below
Degree
of Pollution :
Creepage
and clearance distances are evaluated for the following pollution
degree :
Pollution
degree 1
No pollution or only
dry, non-conductive pollution occurs. The pollution has no
influence.
Pollution
degree 2
Only non-conductive
pollution occurs except that occasionally a temporary conductivity caused
by condensation is to be expected.
Pollution degree
3
Conductive
pollution occurs or dry, non conductive pollution occurs which
becomes conductive
due to condensation is to be expected.
Pollution
degree 4
The pollution
generates persistent conductivity caused by conductive dust or by
rain or snow.
Rated
Impulse Voltage :
The
rated impulse voltage of the product is the peak value of an impulse
voltage with which the terminal block can be loaded
and on which the creepage and clearances according to
relevant standard are based.
CTI
- Comparative Tracking Index of Insulation material
The
insulation material is divided into four groups according to their
CTI (Comparative Tracking Index)
Insulation
I
: 600 ≤ CTI
Insulation II : 400
≤
CTI < 600
Insulation III a : 175
≤
CTI < 400
Insulation III b : 100 ≤ CTI
< 175
The
Comparative Tracking Index must be defined according to DIN IEC 112/
VDE 0303 part 1 on specimens made specifically for this purpose with
test solution A. The proof-tracking index (PTI) is also used to
identify the tracking characteristics of materials. A material may
be included in one of the four groups given above on the basis that
its PTI, established by the method of IEC 112 using solution A, is
equal to or greater than the lower value specified for the
Insulation group.
Current
carrying capacity of terminal block
(DIN
EN 60947-7-1/VDE 0611part1: 2000-05)
The
data given below is for unprepared conductor ends without ferrules.
The rated current for Terminal Blocks with specific function such as
Fuse type, Relays, Terminal Blocks incorporating electronic
components is to be specified by manufacturer.
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Rated
Cross
Section(sq.mm)
|
0.2 |
0.5 |
0.75 |
1 |
1.5 |
2.5 |
4 |
6 |
10 |
16 |
25 |
35 |
50 |
70 |
95 |
120 |
150 |
185 |
240 |
300 |
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Test
current (A) |
4 |
6 |
9 |
13.5 |
17.5 |
24 |
32 |
41 |
57 |
76 |
101 |
125 |
150 |
192 |
232 |
269 |
309 |
353 |
415 |
520 |
Current
Rating with two wire/conductors :
The
total current of the two wires / conductors should not exceed the
continuous current rating of the Terminal Block. The continuous
current rating is the maximum current the terminal block can conduct
without a temperature rise of 45 K (as per EN standard) and 300C (as
per UL / CSA standard).
Note
:
For
PE-Terminals only one conductor should be connected per clamping
part, in accordance with installation requirement.
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