Cabur DBC.4 Bedienungsanleitung

TECHNICAL NOTE

N°

Page

Rev.

Date

Issued

Approv

37 1 0 05/09/16

DBC.4 “increased safety” terminal blocks, are manufactured according to the prescriptions given by

IEC / EN 60079-0, IEC / EN 60079-7 Standards and are in compliance with the ATEX 2014/34/UE Directive and the

IEC Ex Certification Scheme

DBC.4 terminal blocks are also designed and manufactured in compliance with IEC / EN 60947-1 and IEC / EN 60947-7-1

reference product standards.

Terminal blocks (components) must be inserted in Ex e enclosures. The terminal blocks + enclosure assembly must

be subjected to separate certification.

DBC.4 terminal blocks are suited for a temperature range between - 40 and + 80 °C

Ambient temperature range shall be between - 40 and + 40 °C

Rail assembly composition in potentially explosive (Ex e) environments

End section Comb-type cross connection PTC “Easy bridge”

Mounting rail End bracket

Each rail assembly is formed bytwo or more adjoining terminal blocks and by END BRACKETS, that are located atthe ends of

the assembly, in a way to obtain a compact and single arrangement.

As the back of each terminal block performs the function of insulating wall for the adjoining terminal block, an END SECTION is

necessary to close and provide appropriate insulation to the first terminal block forming the assembly.

Rail assemblies can be subdivided into groups by interposing COLOURED PARTITIONS, in order to ease the location of

differentcircuits

Each terminal block can be connected to adjoining elements by means of CROSS CONNECTION of the comb type.

Adjoining terminal blocks can be visuallyseparated by interposing a COLOURED PARTITION, having a thickness of 1,5 mm.

Adjoining jumpers between different phases should be electrically separated by interposing an END SECTION type DBC/PT.

Multiple cross connections can be performed between terminal blocks, by means of a comb-type CROSS CONNECTION the

use of which enables also to obtain parallel extending, pole skipping, staggered, and parallel skipping cross-connection

schemes

Ex e Instruction Manual N° 37

TECHNICAL NOTE

N°

Page

Rev.

Date

Issued

Approv

37 2 0 05/09/16

ATEX Marking:

0722 = number of the ATEX surveillance Notifying Body (CESI)

IM 2 = group I(mines), category M 2

II 2 = group II (surface), category 2

G = explosive atmosphere with presence of GAS

Ex eb = “increased safety” protection mode

IIC = gas group

Gb = EPL

I= group I(mines)

Mb = EPL

DBC = terminal block series or type

4 = rated cross-section of terminal block

IEC Ex Marking Ex eb IIC Gb Ex eb IMb

Ex eb = “increased safety” protection mode

IIC = gas group

Gb = EPL

I= group I(mines)

Mb = EPL

DBC.4 two-level feed-through terminal block - Rated Ex values

Terminal

block

Rated

cross

section

[mm² ]

Gauge

according

IEC

60947-1

Minimum /

maximum

flexible

conductor

[mm² ]

Rated

curr

ent

[A]

Resistance

of the

terminal

block

[ Ω ] (*)

Ex e

rated

voltage

[Vac ]

(**)

Test voltage

[Vac ]

DBC.4 4 A4 0,2 / 6 28 5,54 x 10-4 400 2500

Notes: (*): values calculated from the results of the voltage drop test according to paragraph 8.4.4 of IEC 60947-7-1 Std.

(**): rated voltage values can be subjected to a + 10 % tolerance as listed in Table 1 of IEC 60079-7 Std.

“Easy bridge” PTC comb-type jumper - Jumper connection configurations

Sing

le orparallel

extending

Poleskipping

Adjacent with

partition(**)

Staggeredmode

Parallelskipping

Exeratedvoltage

(Vac)(*) Exeratedvoltage

(Vac)(*)

DBC.4 (upper level) 250 250 250 250 250

DBC.4 (lower level) 250 250 250 250 250

Notes: (*): rated voltage values can be subjected to a + 10 % tolerance as listed in Table 1 of IEC 60079-7 Std.

TERMINAL

BLOCK JUMPER

MULTIPLE

COMMONING BAR SCREW AND SLEEVE

URRENT OF THE JUMPER

[A]

DBC.4 PTC/4/… - - 24

Note (***): the higher current value corresponds to the capacity embedding two jumpers for each one of the poles connected together

Instructions for the connection of PTC “Easy bridge” jumper.

After having cut the bar according to the number of poles, insert the cross-connection in the appropriate groove of the terminal block. At this point,

by using the blade of a screwdriver, push down the cross-connection until it reaches its blocking point. The cross-connection will be fully insulated

and intrinsically IPXXB protected. After having mounted the cross-connection the connected poles can be outlined and visually detected by placing

the PTC/SP green strip. This strip is supplied in a standard length of 100 mm and it can be easy cut to the appropriate length with the aid of a cutter.

To remove the cross-connection it is sufficient to remove the PTC/SP strip: insert the blade of the screwdriver in the jumper slot, then lift it up and

finally extract it.

0722 I M 2 Ex eb I Mb II 2G Ex eb IIC Gb

TECHNICAL NOTE

N°

Page

Rev.

Date

Issued

Approv

37 3 0 05/09/16

Fig. A Fig. B

POSITION COMPONENT TERMINAL BLOCK

INSULATION

STRIPPING LENGTH

[ mm ]

TIGHTENING

TORQUE

[ Nm ] (*)

1 Insulating body DBC.4 9 0,5

2 Upper conducting body

3 Lower conducting body

4 Tightening screw

5 Wire clamping collar Note(*): values taken from Table 4 of IEC 60947-1 Std.

Cabur terminal block type DBC.4 allows the direct and anti-loosening connection of solid, stranded and flexible conductors, by

means of wire clamping collars, captive screws and conducting body.

Each clamping unit shall house only one conductor

The insertion of the cable is eased by:

•Sloping entrance planes provided on the insulating body

•A tab provided in the collar that avoids faulty introduction of the conductors

•Adequate dimensioning of the conductors insertion hole, with respect to the diameter of the maximum connectable conductor

(according to the different Gauges prescribed by IEC 60947-1Std.)

Appropriate grooving, provided in the wire clamping collar and on the conducting body guarantee a perfect electrical contact and an

efficient blocking of the conductor. Both the wire clamping collar and the tightening screw are manufactured in tempered steel with

galvanic RoHS conforming zinc plating; thanks to their coupling it is possible to apply the correct contact pressure

By acting on the tightening screw, the collar tightens the conductor against the conducting body, which is manufactured in tin-plated

copper. With the clamping yoke tightening system a gas proof, particularly safe connection is guaranteed

Thanks to the force applied during the tightening process, the overlapped threaded parts system act,

by means of elastic deformation on the head of the screw, blocking it and avoiding subsequent

loosening

For the connection of the conductor it is necessary to:

1) Loosen the tightening screw (Pos.4 - Fig. A) until it frictions, making the collar (Pos.5 - Fig. A)

reach its lower position; once this operation is performed, the conductor’s insertion hole results

to be completely open and is ready to house the conductor.

2) Prepare the conductor by stripping one end from its insulation (Fig. B) and according to the

correct insulation stripping length given in the table. introduce it in the terminal block until the

limiting wall is reached. By holding firmly the conductor in one hand, tightening operation must be performed (applying the

prescribed torque values given in the table). Once this operation is performed the conductor is firmly secured.

Thanks to the force applied during the tightening process, the overlapped threaded parts system acts, by means of elastic

deformation on the head of the screw, blocking it and avoiding subsequent loosening

TECHNICAL NOTE

N°

Page

Rev.

Date

Issued

Approv

37 4 0 05/09/16

Attestation of Conformity to ATEX 2014/34/UE Directive

Inserted in the following document: M19/e general instructions (leaflet inserted in every package)

Terminal blocks approved in conformity to ATEX 2014/34/UE Directive

Terminal blocks “at increased safety” (Ex e) are manufactured according to IEC/EN 60079-0,

IEC/EN 60079-7 Std. and bear, on the insulating body, the name of the product and the electrical

characteristics.

ATEX Marking:

0722 IM 2 Ex eb IMb II 2G Ex eb IICGb

0722 = number of Notifying Body (CESI) for the ATEX surveillance

IM2 = group I(mines), category M2

II 2 G = group II (surface) category 2 G (gas)

Ex eb = “increased safety” protection mode

IIC= gas group

Gb = EPL

I= group I(mines)

Mb = EPL

V= rated voltage

The CE Marking indicates the Conformity to EU Low-voltage Directive 2014/35/UE

Terminal blocks must be installed in enclosures “at increased safety”; the enclosure / terminal blocks

assembly must be subjected to separate certification

Carlo Zaccone

Legale Rappresentante

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