Page 583 - Wago_Rail-MountedTerminalBlockSystems_Volume1_2015_US.pdf

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The IEC 60999-1/EN 60999-1/VDE may be necessary. Various methods may concentration), which can diffuse into the
0609 clamping unit specification, part be used for this (as illustrated below). conductor bundle along the individual
1, contains the following requirement in strands and cause corrosion deposits
Section 7.1: For applications in special areas with between the individual wires and the
extremely corrosive atmospheres, special clamping point.
Clamping units must be suitable for conditions apply.
connecting unprepared conductors. One Conductor per Clamping Unit
In this case, we recommend using either A number of VDE specifications specify
Under normal operating conditions, direct solid copper conductors or fine-stranded that only one conductor must be con-
clamping (i.e., direct conductor connec- copper conductors with properly nected to each clamping unit (e.g.,
tion to the current bar of the terminal crimped, tin-coated copper ferrules or DIN VDE 0611, Part 4, 02.91, Section
block) provides optimal contact quality copper pin terminals. 3.1.9). The same applies to the recom-
since all risk factors arising from anti- As with solid copper conductors, the fine mendations of the German Automotive
splaying methods are avoided. strands are crimped to a dense inner Industry Association (VDA) “Supply
Occasionally, due to wire handling on core. This prevents ingress of the aggres- specification for the electrical equipment
site, conductor anti-splaying methods sive atmosphere (depending on the ppm of machines, mechanical installations
and buildings in the automotive industry”
II. According to IEC 60999-2, Table 1: according to Section 15.1.1.3; Draft
8.93.
Theoretical Diameter of Largest Conductor

Rated Metric AWG/kcmil Connectable Other VDE and EN specifications likewise
recommend the connection of only one
Conductors
Cross conductor per clamping unit, unless
Section Rigid Fine- Rigid Fine- the clamping unit is specifically tested
Stranded stranded a) Gage Stranded stranded and approved for the connection of sev-
eral conductors, for example:
VDE 0609, Part 1, 12.00/
mm² mm mm mm mm Rigid Flexible EN 60999-1:2000, Section 7.1
50 9.1 11 1/0 9.64 12.08 VDE 0660, Part 600, 06.10/
70 11 13.1 2/0 11.17 13.54 EN 61439-1:2009
95 12.9 15.1 3/0 12.54 15.33 To be Section 8.6.3
– – – 4/0 14.08 17.22 defined in the VDE 0113, Part 1, 06.07/
120 14.5 17 250 15.34 19.01 corresponding EN 60204-1:2006, Section 13.1.1
150 16.2 19 300 16.8 20.48 One conductor per clamping unit is there-
185 18 21 350 18.16 22.05 product
– – – 400 19.42 24.05 standard. fore recommended to meet the safety
240 20.6 24 500 21.68 26.57 requirements of these relevant specifica-
300 23.1 27 600 23.82 30.03 tions. This WAGO principle is the basis
a) Dimensions for class 5 flexible conductors only, according to IEC 60228A. for a number of other technical and eco-
NOTE: The diameters of the largest rigid and flexible conductors are based on Table 1 and Table 3 of IEC nomic advantages:
60228 A and, on ASTM B 172-71 [1], IECA Publication – Each conductor may be terminated or
S-19-81 [2], IECA Publication S-66-524 [3] and IECA Publication S-66-516 [7] for AWG conductors. removed without affecting previously
connected conductors.
– Where re-wiring is required, only the
conductor to be changed is removed
from the clamping point, all other con-
ductors remain safely clamped.
– Each conductor is clamped indepen-
dently.
Tip-bonded conductor Tin-plated copper ferrule
(gas-tight crimped) – Any combination of conductor cross-
Anti-splaying methods require a terminal section can be connected.
block one size larger than the nominal
cross-section of the conductor to be termi- WAGO rail-mounted terminal blocks offer
nated. different solutions to increase the number
The cross section values assigned to the of clamping units:
Ultrasonically bonded conductor individual products with ferrules are based The most common way of increasing the
on the WAGO Variocrimp method from all number of clamping points is by branch-
sides.Gas-tight, crimped twin ferrules may
be used, provided the ferrule is inserted all ing one conductor into two or three con- 14
the way into the clamping unit and that ductors.
there is a sufficient clearance and creep- WAGO offers 3- and 4-conductor termi-
age distance between adjacent potentials. nal blocks, making additional jumpers
Crimped pin terminal (gas-tight), preferably unnecessary.
made of copper with a tin-plated surface.