series
ZETAmini
®
series
ZETApiù
®
series
ZETA
block
®
INDIRECT CLAMPING
TERMINAL BLOCKS
FOR THE CONNECTION OF CONDUCTORS IN ELECTRICAL
SYSTEMS FOR CIVIL, TERTIARY AND INDUSTRIAL USE
GENERAL FEATURES
AND PRACTICAL EXAMPLES OF USE
IN ACCORDANCE WITH THE STANDARDS EN 60998-1: 2004 and EN 60998-2-1: 2004
EN60947-1: 2007+A1: 2011: 2014 and EN 60947-7-1: 2002
Preface
Cembre S.p.A. has been designing and
manufacturing electrical connectors and in-
stallation tools since 1969.
Over the years, it has progressively expand-
ed its presence in the sector, now occupy-
ing an important position at European level.
From the experience gained in the man-
ufacture of products for the production,
transport and distribution of energy,
Cem-
bre
has developed a complete range of in-
direct clamping terminal blocks (ZETAmini,
ZETApiù
and
ZETAblock) for the connec-
tion of conductors in electrical systems for
civil, tertiary and industrial use.
What was the rationale behind
Cembre’s
development of
ZETAmini
terminal blocks,
ZETApiù
single pole terminal blocks
and
ZE-
TAblock
indirect clamping power distribu-
tion blocks?
Careful analysis into the products on the
market has evidenced that electrical system
connections are often made with technolog-
ically outdated terminals.
Their design features make it difficult to cre-
ate stable and safe electrical connections
in compliance with standards.
This causes problems when preparing the
"Declaration of Conformity"
of the electrical
system with regard to terminal connections,
which the installer must prepare and which
entails civil and criminal liability on the part
of the declarant. (Italian Law 46/90, Italian
Presidential Decree 462/2001, etc.).
In this regard, please note that the use of a
terminal bearing the CE marking or a mark
issued by a third party such as IMQ, is not
sufficient in its own right.
The execution of a "state-of-the-art“ system
is in fact dependent on the correct use of
terminals, which must be installed in com-
pliance with the manufacturer's instructions
regarding
"connection capacity".
1
Connection capacity
The "connection capacity" of a terminal
corresponds to the maximum section of
the conductor that can be used and the
number and section of the conductors
with which, in combination , it can be con-
nected.
It is certified by the IMQ according to the
product standards EN 60998-1:1993-08
+ A1:2001, EN 60998-2-1:1993-08,
EN 60947-7-1: 2002
and EN 60947-7-
2: 2002
and is indicated in the catalogues
and on the terminal packaging.
The verification supervisor should ascer-
tain whether this connection capacity has
been respected.
Only by using marked material, and there-
fore certified, and by respecting the man-
ufacturer's instructions for use, can a
system be created that conforms to the
regulations in force.
The improper use of a terminal, even with
IMQ marking, may lead to the implementa-
tion of a non-compliant system.
If, for example, in the presence of the
CE
marking or the IMQ mark , the manufac-
turer declares a connection capacity lim-
ited to combinations of conductors of the
same section, the use of the terminal to
connect conductors of different sections is
to be considered
improper ; in this case
any damage or inconvenience caused by the
connection will be attributable to the install-
er who has not complied with the manufac-
turer's instructions for use.
Thanks to their original construction fea-
tures the ZETA terminal blocks allow the
connection of a very wide range of con-
ductors and therefore facilitate the con-
struction of systems that comply with the
standards.
in accordance with the standards
EN 60998-1: 1993-08 + A1: 2001,
EN 60998-2-1: 1993-08
EN 60947-7-1: 2002 and EN 60947-7-2: 2002
series
ZETAmini
®
series
ZETApiù
®
Anchor plate
for indirect clamping
entry holes
with conical inlet
for easy and quick
insertion of the
conductor
Captive
screws
terminals
with stop ends
for unused
inputs
equipotential
connection
plate
series
ZETA
block
®
2
Connection capacity
•
Example of connections
in which
the installer DID NOT RESPECT
the connection capacity declared
by the terminal manufacturer.
• Examples of connections made
with ZETAmini terminals, charac-
terised by a large connection ca-
pacity.
Example of use of the Z25-1 and Z35-1 type ter-
minals inside junction boxes
• The product has been used im-
properly, the "IMQ" mark cannot
guarantee compliance with stand-
ards and the declaration of con-
formity is not truthful.
• The installer WAS ABLE TO RE-
SPECT the connection capacity
declared by Cembre, creating a
system in compliance with cur-
rent regulations.
Example of use of Z6-1, Z10-1
and Z16-1 type terminals inside junction boxes
3
Connection capacity
Comparative table of ZETAmini and other terminals on the market
CEMBRE
ARNO CANALI
a
BM
b
ELECO
c
SCAME
d
TYPE
Section
mm²
Connection capacity
**
N° of Conductors per Section mm²
Flexible
TYPE
Section
mm²
Connection capacity
N° of Conductors per Section mm²
TYPE
Section
mm²
Connection capacity
N° of Conductors per Section mm²
TYPE
Section
mm²
Connection capacity
N° of Conductors per Section mm²
TYPE
Section
mm²
Connection capacity
N° of Conductors per Section mm²
Flexible Flexible Flexible Flexible
Z2.5-1
2.5
2÷2 X 2.5
2÷3 X 1.5
2÷5 X 1.0
2÷6 X 0.75
2÷10 X 0.50
2 ÷18 X 0.4 ÷ 0.6 mm
single wire for intercom
E22 1
2÷3 X 1
2÷3 X 0.75
2÷4 X 0.50
BM 991 1.5
2÷3 X 1.5
2÷3 X 1.0
2÷4 X 0.75
E23 1.5
2÷3 X 1.5
2÷3 X 1
2÷4 X 0.75
812,372 1.5
1÷3 X 2.5
1÷2 X 1.5
1÷3 X 1.0
2÷4 X 0.75
B25 2.5
2÷3 X 2.5
2÷3 X 1.5
2÷4 X 1.0
BM 992 2.5
2÷3 X 2.5
2÷3 X 1.5
2÷4 X 1.0
E25 2.5
2÷3 X 2.5
2÷3 X 1.5
2÷4 X 1.0
812,374 2.5
1÷3 X 4
1÷2 X 2.5
2÷3 X 1.5
2÷4 X 1.0
Z6-1
6
2÷2 X 6
2÷3 X 4
2÷4 X 2.5
2÷6 X 1.5
2÷8 X 1.0
2÷10 X 0.75
2÷12 X 0.50
(1 x 6) + (4 x 1.5)
(1 x 6) + (2 x 2.5)
B40 4
2÷3 X 4
2÷3 X 2.5
2÷4 X 1.5
BM 9924
4
2÷3 X 4
2÷3 X 2.5
2÷4 X 1.5
E26 4
2÷3 X 4
2÷3 X 2.5
2÷4 X 1.5
812,375 4
1÷3 X 6
1÷2 X 4
2÷3 X 2.5
3÷4 X 1.5
B60 6
2÷3 X 6
2÷3 X 4
2÷4 X 2.5
BM 993 6
2÷3 X 6
2÷3 X 4
2÷4 X 2.5
E27 6
2÷3 X 6
2÷3 X 4
2÷4 X 2.5
812,376 6
1÷3 X 10
1÷2 X 6
1÷2 X 4
2÷3 X 2.5
3÷4 X 1.5
Z10-1
10
2÷2 X 10
2÷3 X 6
2÷5 X 4
2÷8 X 2.5
2÷12 X 1.5
2÷20 X 1.0
2÷25 X 0.75
(1 x 6) + (1 x 4) + (2 x 2.5) + (3 x 1.5)
B100 10
2÷3 X 6
2÷3 X 4
BM 994 10
2÷3 X 10
2÷3 X 6
2÷4 X 4
E29 10
-
2÷3 X 6
2÷3 X 4
812,378 10
1÷3 X 16
1÷2 X 10
2÷3 X 6
3÷4 X 4
Z16-1
16
2÷2 X 16
2÷3 X 10
2÷5 X 6
2÷8 X 4
2÷12 X 2.5
2÷18 X 1.5
B160 16
2÷3 X 16
2÷3 X 10
2÷3 X 6
BM 995 16
2÷3 X 16
2÷3 X 10
2÷3 X 6
E30 16
-
2÷3 X 10
2÷3 X 6
812,379 16
1÷3 X 25
1÷2 X 16
2÷3 X 10
3÷4 X 6
Z25-1
25
2÷2 X 25
2÷3 X 16
2÷4 X 10
2÷8 X 6
2÷11 X 4
4÷16 X 2.5
B250 25
2÷3 X 25
2÷3 X 16
2÷3 X 10
BM 9960 25
2÷3 X 25
2÷3 X 16
2÷4 X 10
E32 25
-
2÷3 X 16
2÷3 X 10
Z35-1
35
2÷2 X 35
2÷3 X 25
2÷4 X 16
2÷7 X 10
2÷11 X 6
4÷17 X 4
5÷28 X 2.5
B350 35
2÷3 X 35
2÷3 X 25
2÷3 X 16
BM 9961 35
2÷3 X 35
2÷3 X 25
2÷3 X 16
E35 35
-
2÷3 X 25
2÷3 X 16
810.435/TR
35
1÷3 X 50
1÷2 X 35
1÷3 X 25
2÷4 X 16
a
Information taken from the website
May 2007
**
In addition, combinations of the conductors
provided for in the specific field can also be connected
provided that the resulting overall section does not
exceed double the nominal section.
b
Information taken from the catalogue
2007 edition
c
Information taken from the "Catalogue '99"
d
Information taken from the website
May 2007
4
What is direct clamping?
conductor
uncompressed
elementary
wires
screws
bushing
The screw operates directly on
the conductors causing signifi-
cant deformation, in addition, the
abrasive action due to the rota-
tional movement during clamping
seriously compromises the integ-
rity of the elementary wires.
The clamping screw does not compress
100% of the conductors contained in the
contact bushing, as its diameter is great-
er than that of the screw.
This leads to an increase in the current
density in the compressed conductor sec-
tion of the screw and an inevitable
overheating.
Sectional view of a
direct clamping terminal
For direct clamping, the screw of the termi-
nal directly presses the conductor against
the bushing, usually made of brass.
The conductor receives two stresses from
the screw simultaneously: compression
between the screw head and the bushing
stop wall, and rotation, due to the move-
ment that the screw itself must make in
order to advance.
In practice only one part of the elementary
conductor wires, those directly under the
screw, are pressed against the bushing and
therefore contribute to the electrical con-
nection; many of these, as a result of the
rotation action caused by the screw, are de-
formed to such an extent as to compromise
their integrity.
In addition, some elementary wires, those
that are outside the screw compression
area, do not actively contribute to the elec-
trical connection; the actual section that
carries current is therefore less than the
nominal section of the conductor. In this
objectively critical situation, possible over-
loads can lead to dangerous overheating
and therefore to a sudden decay of the con-
nection.
5
And indirect clamping?
screws
plate
conductor
bushing
Sectional view of an
indirect clamping terminal
Indirect clamping is a system widely used on
various devices, such as automatic switch-
es, relays, equipment terminals, etc., to
make an electrical connection between a
conductor and a fixed element. The connec
-
tion is made by the pressure exerted by a
moving element under the
indirect
action of
a screw.
The conductor is practically compressed
between two parallel surfaces, one fixed
and the other mobile, until it reaches a
static situation in which all the elementa
-
ry wires, perfectly integrated, contribute
homogeneously
in the transport of the cur-
rent.
The result: the connection made in this way is
exceptionally
stable over time; the extremely
low crossing resistance value is practically
impervious to thermal changes generated
by possible overloads; the very structure
of the connector, similar to a closed cage,
"breathes elastically", supporting thermal
deformations without loosening the connec
-
tion.
Cembr
e
has always adopted indirect clamp-
ing in its
Zetamini
,
ZETApiù
and
Zetablock
terminals which, combined with a careful se-
lection of materials and treatments, has al-
lowed the creation of products that embody
the best on the market in this sector
.
6
How does a connection behave
over time?
Cembre's goal in the design and manu-
facture of its connectors is to come as
close as possible to the optimum condi-
tion for continuous, intact conductors.
A correctly executed connection, when
it is made, has characteristics practi-
cally similar to the intact conductor, but
over time it suffers from "ageing", to a
greater or lesser extent, depending on
the types of terminals used and their in-
stallation.
The most obvious effect of this aging
is an increase in electrical resistance,
which corresponds to an increase in
temperature.
This situation does not cause any prob-
lems in a connection up to standard
made to quality terminals that have
been installed correctly.
If, on the other hand, the connection
has been made with poor quality ter-
minals or without respecting their con-
nection capacity, a critical condition is
created that develops over time as it
does not trigger any system protection
intervention (fuses or magnetothermal
switches).
In practice, the connection progressive-
ly heats up until it reaches the critical
temperature of the materials insulat-
ing the cable or terminal .
Connections of different voltages or
currents may come into contact with
each other, giving rise to short circuits
or ignition caused by particles of insu-
lating material at high temperatures in
contact with flammable or combustible
material.
This is what is often diagnosed by fire
fighters as "Fire due to electrical short
circuit".
The method commonly used to evaluate
the behaviour of a connection over time
is to subject it to an ageing test with
thermal cycles.
The diagram and the graph opposite
(Fig. 1 and Fig. 2) refer to a compar-
ative test with thermal cycles between
indirect clamping ZETA terminals and
direct clamping terminals.
In our case, we used PVC insulated con-
ductors of 6 mm² section
, ZETAmini
type Z6-1 indirect clamping terminals
and direct clamping terminals with
brass bushing and steel screw
; the
maximum connection capacity for both
types is 2x6 mm². In the circuit series
a current of 35 A was made to circu-
late, such as to generate
a tempera-
ture of 70 ° C on the reference conduc-
tor
.
For each cycle, the power supply last-
ed 30 minutes, followed by 30 minutes
of forced cooling to room temperature;
the temperatures of the two terminals
and conductor were measured at reg-
ular intervals. Overall, there were 150
cycles.
The graph shows how the direct clamp-
ing terminal
undergoes a significant
temperature increase already from the
first cycles until it reached, after about
100 cycles, the critical temperature of
softening of the conductor's PVC insula-
tion, which is 80°C , and at the end of
the test it had reached about 100°C.
7
120
110
100
90
80
70
60
0 50 100 150
T conductor
[°C]
T indirect
clamping ZETA
terminal [°C]
T direct
clamping
terminal [°C]
No. of cycles
Temperature [° C]
indirect
clamping
ZETA
terminal
direct
clamping
terminal
Diagram of the test circuit
Sect. Cond. = 6
I = 35 A ~
Thanks to their original construction characteristics, ZETA terminals
enable connections to be made with a stable contact resistance over time.
The behaviour of the
ZETA
terminal blocks
during the thermal cycles with
respect to a
direct clamping terminal and with a brass
bushing, is shown in the graph below.
Two clamps, one with indirect clamping and
the other with direct clamping, connected
in series, were energised for 30 minutes
and cooled for 30 minutes.
The heating/cooling cycle was repeated
150 times, measuring the temperature of
the two terminals and of the conductor at
regular intervals.
Figure 2
Figure 1
8
9 good reasons to choose ZETAmini and ZETApiù
4x2.5 mm²
6x1.5 mm²
1x4 mm²
+
2x2.5 mm²
2x2.5 mm²
+
3x1.5 mm²
4x2.5 mm²
6x1.5 mm²
1x4 mm²
+
2x2.5 mm²
2x2.5 mm²
+
3x1.5 mm²
DIRECT CLAMPING
TERMINALS
CEMBRE ZETA SERIES INDI-
RECT CLAMPING TERMINALS
LIMITED CONNECTION CAPACITY
The number of conductors that can be con-
nected is not limited as long as the total of
their section is suited to the nominal section
of the terminal; the conductors can
have different sections.
AMPLE CONNECTION CAPACITY
Example of terminal
with nominal section 6 mm² (flexible)
Difficult insertion of con-
ductors due to discon-
tinuity between the
internal diameter of
the contact bushing
and that of the insu-
lating casing.
Insertion facilitated by the coni-
cal entrance in the insulating
casing.
The conductors must be
twisted together before they
are inserted into the contact
bushing. This operation takes
time and therefore makes
it difficult to discon-
nect the conductors
to find a fault or in-
correct connection.
It is not necessary to twist the
conductors before they are
inserted into the terminal.
Any disconnection need-
ed is extremely simple.
(Time saving)
The screw operates
directly on the conduc-
tors causing significant
deformation, in ad-
dition, the abrasive
action due to the
rotational move-
ment during clamp-
ing seriously compro-
mises the integrity of the
elementary wires.
The screw does not operate
directly on the conductors;
they are compressed be-
tween a steel cage and
a contact rod.
This results in a
highly relia-
ble connec-
tion without
compromising
the integrity of the
elementary wires.
Z6-1
example:
NO
NO
YES
NO
YES
YES
YES
YES
4
9
DIRECT CLAMPING
TERMINALS
CEMBRE ZETA SERIES INDI-
RECT CLAMPING TERMINALS
The hardened steel cage is a sturdy but
elastic structure; during clamping it deforms
elastically, accumulating energy thanks to
which clamping remains constant during the
thermal cycles to which the connection is
subjected.
The brass clamping bushing is an extremely rig-
id structure, which does not accumulate elastic
energy during clamping.
Expansions due to thermal cycles typical of
normal operation are therefore not compen-
sated in any way, thus trig-
gering a overheating
phenomenon that
leads the connec-
tion to rapidly
deteriorate.
The clamping screw
does not compress
100% of the conductors
contained in the contact bushing
as its diameter is greater
than that of the screw.
This leads to an increase in the current density in
the compressed conductor section of the screw and
an inevitable overheating.
The wires are com-
pressed evenly and
completely thanks to the
steel cage and the contact
plate. The current transport-
ed is distributed naturally and evenly through
all the conductors’ elementary wires; this
contributes to maintaining stable contact over
time.
The transverse dimension
is extremely limited thanks
to the rectangular shape
of the clamping cage.
The transversal
dimension of the
cap terminals is
greater due to
the internal circu-
lar brass bushing.
The screw of terminals com-
monly available on the market
can, due to vibrations during
transport, loosen complete-
ly, causing the terminal to
dismantle.
Due to the special design of
the ZETAmini and ZETApiù
terminals, the screw will
remain in place even if
completely loose.
INTERCOMS
Direct clamping termi-
nals are not suitable
for connecting small
diameter rigid conduc-
tors (Ø 0.4÷0.6 mm),
as the clamping screw
tends to spread them
without compressing, or
significantly deform them, mak-
ing them fragile until they break.
INTERCOMS
Indirect clamping terminals
make a good connection
even on small diameter
rigid conductors (Ø 0,4÷0,6
mm) thanks to the steel
cage that contains them and
compresses them against
the contact plate.
5
7
8
9
6
10
One-way indirect clamping terminals
Easy
insertion
Captive
screws
Anchor plate
for
indirect
clamping
Example of use of Z6-1, Z10-1
and Z16-1 type terminals inside junction boxes
Example of use of Z25-1 and Z35-1
type terminals inside junction boxes
Example of use of
Z2.5-1 type terminals
inside a round
junction box
series
ZETAmini
®
11
One-way indirect clamping terminals
• Maximum operating: 85°C
•
Self-extinguishing: V-0 (UL 94)
•
Nominal voltage: 450V
•
Material: polycarbonate body, terminal
and screws in electrolytically
galvanized steel, anchor plate
in electrolytically plated steel
GENERAL FEATURES
Directive 2014/35/UE
EN 60998-1: 2004 and
EN 60998-2-1: 2004 Norms
"Italian Naval Register"
Lloyd's Register
of Shipping
1
1
1
Z2.5-1
Z6-1
Z10-1
7.6x20xh23.5
11.5x28xh29
2.5
6
10
1
Z16-1
18x34xh38
16
1
Z25-1
20.8x42.5xh43.4
25
1
Z35-1
25x45xh51.5
35
TYPE
N ° WAYS
INTERNAL
PACKAGING
N° pcs
EXTERNAL
PACKAGING
N° pcs
DIMENSIONS
mm
NOMINAL
SECTION
15.6x32xh32.5
25 500
25 250
10 100
10 100
10 50
10 40
MARKINGS AND MARKS
2.5
mm
2
450 V
T 85 ° C
6
mm
2
450 V
T 85 ° C
25
mm
2
450 V
T 85 ° C
16
mm
2
450 V
T 85 ° C
10
mm
2
450 V
T 85 ° C
35
mm
2
450 V
T 85 ° C
series
ZETAmini
®
12
One-way indirect clamping terminals
Z35-1
2 x 35 mm
2
rigid or flexible
Z25-1
2 x 25 mm
2
rigid or flexible
Z16-1
2 x 16 mm
2
rigid or flexible
Z10-1
2 x 10 mm
2
rigid or flexible
2 x 6 mm
2
rigid or flexible
Z2.5-1
2 x 2.5 mm
2
rigid or flexible
Maximum capacity:
Terminal Type
series
ZETAmini
®
Z6-1
13
Z2.5-1
2 x 2.5
R/F
2÷3 x 1.5
R/F
2÷5 x 1.0
R/F
2÷6 x 0.75
R/F
2÷10 x 0.5
R/F
2÷18 x ∅ 0.4 ÷ 0.6 mm
communication type wire
2.5
Nominal
Section
Connection capacity*
No. of Conductors per Section
Type
Z6-1
2 x 6
R/F
2÷3 x 4
R/F
2÷4 x 2.5
R/F
2÷6 x 1.5
R/F
2÷6 x 1
R/F
2÷10 x 0.75
R/F
2÷12 x 0.5
R/F
(1 x 6
F) + (4 x 1.5
F)
(1 x 6
F) + (2 x 2.5
F)
6
Z10-1
2 x 10
R/F
2÷3 x 6
R/F
2÷5 x 4
R/F
2÷8 x 2.5
R/F
2÷12 x 1.5
R/F
2÷20 x 1
R/F
2÷25 x 0.75
R/F
10
Z16-1
2 x 16
R/F
2÷3 x 10
R/F
2÷5 x 6
R/F
2÷8 x 4
R/F
2÷12 x 2.5
R/F
2÷18 x 1.5
R/F
16
Z25-1
2 x 25
R/F
2÷3 x 16
R/F
2÷4 x 10
R/F
2÷8 x 6
R/F
2÷11 x 4
R/F
4÷16 x 2.5
R/F
25
Z35-1
2 x 35
R/F
2÷3 x 25
R/F
2÷4 x 16
R/F
2÷7 x 10
R/F
2÷11 x 6
R/F
4÷17 x 4
R/F
5÷28 x 2.5
R/F
35
(1 x 6
F) + (1 x 4
F) + (2 x 2.5
F) + (3 x 1.5
F)
Connection capacity of ZETAmini series
one-way terminals
R = rigid conductor
F = flexible conductor
*A mixture of conductor sizes may be connected to the terminal block provided that the sum
of their sections is less than twice the nominal section.
14
Unipolar multi-way indirect clamping
terminal blocks
Example of use of the Z6-5D type terminal blocks
inside a junction box
Example of use of the Z16-5ND series terminal
blocks inside a junction box
Example of use of the
Z6-3 and Z6-5 type
terminals inside
boxes for civil use
Captive
screws
Easy
insertion
Equipotential
connection
plate
series
ZETApiù
®
15
Unipolar multi-way indirect clamping
terminal blocks
• Maximum operating temperature: 85°C
•
Self-extinguishing: V-0 (UL 94)
•
Nominal voltage: 450V
•
Material:
polycarbonate body, terminal
and screws in electrolytically
galvanized steel, connection
plate in electrolytically plated
ETP copper.
GENERAL FEATURES
TYPE
N° WAYS
MARKINGS AND MARKS
PACKAGING
N° pcs
DIMENSIONS
mm
NOMINAL
SECTION
20
10
30
10
35x23xh27.5
35x40xh36.5
23x23xh27.5
23x40xh36.5
6
6
15
10
23x43xh28.5
23x53xh33
3
16
20
15
38x31.3xh38
38x50xh44
4
16
15
10
27x54xh37
27x58xh43
10
6
10
15
35x43xh28.5
35x53xh33
D =
version with DIN rail mounting
8 (2+6)
(2) 16
+ (6) 6
15
10
35.5x50xh36.5
35.5x57xh42
5 6
3
6
5
16
10
4
61x31.5xh38
61x50xh44
16
mm
2
450 V
T 85 ° C
16
mm
2
450 V
T 85 ° C
6
mm
2
450 V
T 85 ° C
11 (1+10)
(1) 35
+ (10) 6
58x43xh42
58x53xh47
10
10
35÷6
mm
2
T 85 ° C
6 (2+4)
(2) 35
+ (4) 16
83x41xh43
83x49xh52
8
5
35÷16
mm
2
450 V
T 85 ° C
5
5
4 35
37x85xh42
37x85xh48
10 (2+8)
Z50-10D
(2) 50
+ (8) 25
77.5x55xh49
6
26 (2+24)
Z35-26D
(2) 35
+ (24) 10
151x52xh48
4
35÷10
mm
2
T 85 ° C
6
mm
2
450 V
T 85 ° C
10
5
3 35
53x48.5xh42
53x50xh48
35
mm
2
450 V
T 85 ° C
16÷6
mm
2
450 V
T 85 ° C
12 (2+10)
(2) 16
+ (10) 6
104.5x32.5xh36.5
104.5x50xh42
8
5
16÷6
mm
2
450 V
T 85 ° C
Z6-3
Z6-3D
Z6-5
Z6-5D
Z6-6
Z6-6D
Z6-10
Z6-10D
Z16-3
Z16-3D
Z16-4
Z16-4D
Z16-5N
Z16-5ND
Z16-8
Z16-8D
Z16-12
Z16-12D
Z35-3
Z35-3D
Z35-4
Z35-4D
Z35-6
Z35-6D
Z35T-11
Z35T-11D
35
mm
2
450 V
T 85 ° C
16
mm
2
450 V
T 85 ° C
EN 60998-1: 2004 and
EN 60998-2-1: 2004 Norms
"Italian Naval Register"
Lloyd's Register
of Shipping
series
ZETApiù
®
Directives 2014/35/UE
50÷25
mm
2
T 85 ° C
**
EN60947-1: 2007+A1: 2011: 2014
and EN 60947-7-1: 2002 Norms
**
16
ZETApiù unipolar multi-way terminal blocks
Further Features
Equipotential
connection
plate
Body
Easy
insertion
Bushing
Captive
screws
Equipotential
connection
plate
The ZETApiù unipolar multi-way terminal
blocks are characterised by a certain num-
ber of inputs/outputs, of an equal or differ-
ent calibre, electrically connected to each
other by a plated copper plate. A ZETApiù
terminal block therefore creates conduc-
tors junctions and/or bypasses with the
same voltage.
This particular construction has clear
advantages compared to some tradition-
al systems; for example, it is possible to
perform the single disconnection of the
conductors, required in particular fields
of application by the
CEI 64-8 and 64-8
/ 710 standards.
Fault-inspection is very simple, as are
continuity checks and resistance meas-
urements on sections of the system.
Installation times are also reduced com-
pared to the use of modular terminals
requiring jumpers or the use of perfo-
rated rods needing to be connected by
means of cable terminals.
In the diagrams opposite, the ele-
ments that make up the
ZETApiù
terminal blocks are clearly visible:
the electrolytically plated ETP copper
equipotential connection plate, the elec-
trolytically galvanized steel bushings and
screws, the polycarbonate body with an
appropriate shape so as to create captive
screws and facilitate the insertion of con-
ductors.
The
ZETApiù terminal blocks are available
in mobile version or with a rear
connection for mounting on DIN
rails.
They have an IP20 degree of protection,
which makes them suitable for phase
connections; some terminal blocks
(Z35T-11, Z35-26D, Z50-10D) are
instead specifically designed for the
construction of earthing nodes.
17
ZETApiù unipolar multi-way terminal blocks
Crossing resistance
MAXIMUM CURRENT:
The ZETApiù terminal blocks can with-
stand currents higher than the maximum
stationary capacity of the cable with the
largest section that can be connected to
the terminal block itself. (table 2)
The terminal blocks are able withstand
the stresses caused by the acceptable
currents in ordinary operation wiring
and by the short-circuit currents deter-
mined according to the characteristics
of the protection devices. The maximum
short-circuit current that can be tolerat-
ed by the terminal blocks (for a period of
1 second) without any functional damage
is given in Table 3.
CURRENT Max (A)
(stationary)
60
100
170
220
TABLE 2
Z6
Z16
Z35
Z50
TERMINAL BLOCK
series
TABLE 3
Time
(S)
1
1
1
1
TERMINAL BLOCK
series
Z6
Z16
Z35
Z50
Icc Max
(A)
1000
2700
6000
8500
The crossing resistance is the parame-
ter that indicates whether, and in what
proportion, the terminal block has a
higher resistance than a conductor of
equal length and section.
As regards the ZETApiù terminal blocks,
the crossing resistance is practically equal
to the cable resistance (see table 1).
This result is obtained thanks to the
clamping system and the characteris-
tics of the equipotential plate in plated
copper with a section equal to or great-
er than the maximum section of the
conductor that can be housed in the
terminal block.
TERMINAL
BLOCK
Type
CONNECTION
(H07 VK cable)
TABLE 1
(1)
RESISTANCE
CABLE (
m
Ω)
length 1 m
(2)
RESISTANCE
CABLE-TERMINAL BLOCK
(m
Ω
) total length 1 m
Z6-3
Z6-3
Z6-5
Z6-5
Z6-5
Z16-3
Z16-3
Z16-5N
Z16-5N
Z16-5N
Z16-12
Z35-6
Z35-6
Z35-6
1.5
– 1.5
6
– 6
1.5
– 1.5
6
– 1.5
4
– 4
2.5
– 2.5
16
– 16
6
– 6
16
– 6
16
– 16
16
– 6
35
– 35
35
– 16
35
– 6
12.426
2.924
12.426
7.675
4.456
7.841
1.123
2.924
2.023
1.123
2.023
0.777
0.983
1.867
11.925
2.976
12.168
7.012
4.435
7.791
1.158
2.940
2.012
1.141
1.946
0.767
0.938
1.768
(1)
Resistance of the H07 VK type cable used
in the connection.
In the case of a junction without section
variation, the resistance is relative to 1 m of
cable. In the case of junction with a section
variation, the resistance is relative to 0.5
m of cable with a larger section plus 0.5
m of cable with a smaller section (example:
connection 16-6 using Z16-12, R cable =
R 0.5 m cable section 16 mm² + R 0.5 m
cable section 6 mm²).
(2) Cable-to-terminal connection resistance for
a total length of 1 m
Terminal
Z6-5
Terminal
Z16-12
L
Terminal
L
Terminal
L cable L cable
18
Unipolar multi-way terminal
Z16-
5N
•
Z16-
5ND
Z6-3 •
Z6-3D
Z6-5
•
Z6-5D
Z16-
12
•
Z16-
12D
Z16-3
•
Z16-3D
Z6-10
•
Z6-10D
Z6-6 •
Z6-6D
Z16-8
•
Z16-8D
Z16-4 •
Z16-4D
Maximum capacity:
Terminal block Type
5 x 16 mm
2
rigid or flexible
2 x 16 mm
2
10 x 6 mm
2
flexible
3 x 6 mm
2
rigid or flexible
3 x 16 mm
2
rigid or flexible
5 x 6 mm
2
rigid or flexible
10 x 6 mm
2
rigid or flexible
6 x 6 mm
2
rigid or flexible
2 x 16 mm
2
6 x 6 mm
2
rigid or flexible
4 x 16 mm
2
Flexible
+
D = version with DIN rail mounting
+
series
ZETApiù
®
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