Scame ZENITH-P Serie Instrucciones De Instalación, Funcionamiento Y Mantenimiento Para El Uso En Condiciones De Seguridad página 6

ZENITH-P Series [CONTROL STATIONS]
3 Installation
Installation shall be carried out by suitably-trained personnel in accordance with the
applicable code of practice (e.g. IEC EN 60079-14) and the provisions of the national safety
and accident prevention regulations and this instruction manual.
3.1 Safety instructions
The IP rating of the enclosure shall be maintained for the area of installation by the use of correct arrangement
of cable-gland and blanking plug elements & sealing and in accordance with the installation rules. Where
other certified components are part of the assembly, the user must take account of any limitation listed on
relevant certificates.
Where other certified components are part of the assembly, the user must take account of
any limitation listed on relevant certificates.
These instructions assume that the required cable entries have been pre-drilled (and may be threaded) on the
enclosure. The cable glands are usually fitted during installation.
The enclosure must be installed in absence of damage and free of defects.
3.2 Accessories
The installation of the accessories must be performed before the installation of the enclosure, and following
the relevant instruction sheets.
Accessories available:
- Backplates made of zinc plated steel
- Mounting bracket made of stainless steel AISI 316
- External hinges made of thermoplastics material
- Earth continuity plate (internal) made of zinc plated steel - Available also in brass or copper
- Earth-stud (stud, nuts and plain washer) made of brass - Available in stainless steel AISI 316.
- Breather/drain valve with separate certificate.
- Cable-glands and blanking-plugs with separate certificate.
- Mounting bracket for terminal block made of zinc plated steel, brass, copper or stainless steel.
- Earth Terminal bar.
- Pad-lockable kit for enclosure (additional external accessory).
Only approved and genuine SCAME accessories must be used.
3.2.1 Earth Terminal Bar
Earth terminal bar is made in copper with stainless steel screw in order to connect cable from 0.5mm² to
35mm², as indicated in the following table.
The wire shall be terminated with a crimping lugs.
For Creepage and Clearance distance refer to table 3.
The minimum cross section area of PE conductors shall be following the table:
Cross-sectional area of
phase conductors, S mm
2
S ≤ 16
16 < S ≤ 35
S > 35
Torque Values
Maximum Cable Earth-Bar
Cross Section Screw
2.5 mm² M4
6 mm² M4
16 mm² M5
35 mm² M6
3.2.2 PadLockable
When Padlock is used, connect through its terminal-screw to earth.
3.3 Terminal fitting
Any ATEX / IECEx ( for ATEX / IECEx version ) or EAC Ex ( for EAC Ex version ) certified terminal "Ex e" accord-
ing to IEC EN 60079-7 / ГОСТ Р МЭК 60079-7-2012 can be used. Terminals shall be rail or internal plate
mounted. Terminals must be installed in accordance with the operating instructions issued by the respective
manufacturer and in compliance with requirements for clearance/creepage, cross-connections and earthing.
All wiring must be carried out in accordance with the code of practice and installation standards in hazard-
ous areas like IEC EN 60079-14. Use the correct size of tool and torque (see manufacturer documents) for
tightening the terminal clamps (screwdriver or spanner). Creepage and clearance distances shall comply with
IEC EN 60079-7 / ГОСТ Р МЭК 60079-7-2012 (table 3), current and maximum dissipated power shall not
exceed the maximum allowed.
The maximum number of terminals is determined by:
- the physical dimensions (see table 2);
- the minimum clearance and creepage distances between the terminals and the enclosures walls (see figure
2 and table 3);
- the heating at the terminal points: the enclosure must be used respecting the maximum certified power
dissipation related to a given temperature class (see table 4).
Care must be taken to ensure that the size of the enclosure can accommodate the cable bending radius.
3.3.1 Maximum number of terminals based on physical dimension
Table 3 – Maximum number of terminals – Physical dimensions
Figure 4 – Details of creepage and clearance distances and mounting of metallic cable gland.
Note: Voltages are nominal voltages – the working voltage may exceed by 10% the voltage level given.
3.3.2 Maximum Power Dissipation
The total calculated dissipated power shall not exceed the figures given in Tables below.
Table 4a – Cage type terminals - Maximum power dissipation
Table 4b – Screw type terminals - Maximum power dissipation
3.4 Notes Ex i circuits
Where Ex-i circuits are present, Ex-i terminals shall be blue and/or supplied with a suitable identification label.
If Ex-i circuits and NOT Ex-i circuits are present, Ex-i terminals and NOT Ex-i terminals shall be separated by
one of the following methods:
When separation is accomplished by distance, then the clearance between terminals shall be at last 50mm.
Care shall be applied in the layout of terminals and in the wiring method used so that contact between circuits
is unlikely if a wire become dislodged.
MP39686
Minimum cross-sectional area of the
corresponding protective conductor, Sp mm
S
16
0,5 S
Pitch Torque Nm
10 mm 1.2
11 mm 1.2
13 mm 2
18 mm 2.5
When separation is accomplished by use of un insulating partition or earthed metal partition, the partitions
used shall extend to within 1,5mm of the walls of the enclosure, or alternatively provide a minimum distance
of 50mm between the terminals when taken in any direction around the partition.
3.5 Terminal service temperature
When terminals are installed within a:
- T6 enclosure they shall be rated for a minimum of +80°C.
- T5 enclosure they shall be rated for minimum of +111°C.
- T4 enclosure only ceramic terminals shall be used.
3.6 Cable Glands
Use only Ex e and/or Ex t IIIC approved glands (as relevant). Certified cable glands can only be fitted with a
suitable IP rating commensurate with IP rating of the enclosure.
Ensure that all the cable-glands used, shall be suitable for the cable in order to prevent self-loosening and
ensure permanent sealing to avoid moisture ingress.
The clamping of the cables, for the cable size 63, must be realized outside of the enclosure, nearby to the
enclosure on which the cable glands are installed. The other conditions are stipulated on the instructions.
3.6.1 Sealing parameters relating to the safety
The COT (Continuous Operating Temperature) sealing washers for cable glands and blanking plugs element
should be suitable at range service temperature:
For Example:
-40°C to 100°C with EPDM or Nylon gasket
-70°C to 220°C with SILICONE gasket
Sealing maybe be used in order to improve the seal between the cable-gland and the enclosure.
3.6.2 Blanking Plugs elements
Any unused entries must be blanked using a suitably approved blanking plugs with separate certificate.
The maximum number of cable glands or blanking plug elements can be fitted is indicated on Table 5.
On demand should be possible to drill the bottom side allowed by the certification documents.
3.6.3 Maximum Cable-Entries
Table 5 - Standard entry arrangements
3.7 Commands, Controls and Signalling components
- All components (actuators, switch and signalling elements) have ATEX / IECEx / EAC Ex separate certifi-
cates. Installation and maintenance shall be done as prescribed by manufacturer documents.
- The ambient temperature range will be limited by the component (terminal, actuator, switch, etc.) with the
worst characteristics.
- Only SCAME approved components can be mounted.
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- Creepage and clearance distances shall comply with EN 60079-7 / ГОСТ Р МЭК 60079-7-2012 (table 3),
current and maximum dissipated power shall not exceed the maximum value allowed.
- The equipment must be mounted vertically with the conductor terminal mounted to the rear of the enclosure
and the actuator components fitted to the cover of the enclosure.
3.8 Drain / Breathing valves
Drain/breathing valves have ATEX / IECEx / EAC Ex separate certificate. Installation and maintenance shall be
done as prescribed by manufacturer documents.
IP rating of drain/breathing valves fitted shall be suitable with the IP rating of the enclosure.
3.9 Instruments
- All measuring instruments have ATEX / IECEx / EAC Ex separate certificates. Installation and maintenance
shall be done as prescribed by manufacturer documents.
- Only SCAME approved instruments can be mounted.
If the junction boxes are NOT fitted with wiring by SCAME, each Zenith-P Enclosure shall be
subject to a routine dielectric streght test of 1000 V + 2U rms or 1500 V rms, whichever is the
greater applied between the terminal block and the enclosure for a period of 60 s as required by clause
6.1 of IEC EN 60079-7 / ГОСТ Р МЭК 60079-7-2012. Alternatively, a test shall be carried out at 1.2 times
the test voltage, but maintained for at least 100 ms.
4 Servicing and maintenance and repairing
Inspection and maintenance of this equipment shall be carried out by suitably trained
personnel in accordance with the applicable code of practice (e.g. EN 60079-17). Repair of
this equipment shall be carried out by suitably trained personnel in accordance with the applicable
code of practice (e.g. EN 60079-19). During servicing, it is particularly important to check those
components upon which the type of protection depends.
4.1 Routine Maintenance
Routine maintenance is required in order to guarantee the efficiency of the enclosure and to maintain the
required level of protection.
1) Check that the lid seal is in place and not damaged - each time the enclosure is opened.
2) Check that all the lid fixing screws are in place and secured -each time the enclosure is opened.
3) Check that the mounting screws/bolts are tight and free of corrosion annually.
4) Check the security of all cable glands - annually.
5) Check the enclosure for damage - annually.
6) In zones with presence of combustible dusts it is necessary to periodically clean the upper surface of the
box, limiting the depth of the layer to less than 5 mm.
Storage conditions
Storage Temperature : from -xx°C (1) to +70°C.
Relative Humidity : ≤95%RH
(1) For the minimum storage temperature see the minimum ambient temperature indicated on the label.
The estimated product lifetime is 10 years if maintenance and storage condition are respected and all prescrip-
tions specified applied in this instructions.
4.2 Resistance to chemical Agent
Consideration should be given to the environment in which these enclosures are to be used to determine the
suitability of these materials to withstand any corrosive agents that may be present.
4.3 Disposal
Disposal and recycling of the product shall be done according to national regulations for waste disposal and
recycling.
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ZP90869-4