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

ZENITH-P Series [JUNCTION BOXES]
2.5 Maximum Ambient temperature range Tamb
The equipment is certified for a maximum ambient temperature range -60°C / +75°C (-60°C /
+60°C for enclosures item 644.0380, 644.0390, 644.0485 and 644.0595) with appropriate terminals
and accessories. The ambient temperature is marked on the label and the junction boxes should not
be used outside this range.
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 & 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.
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.
- Padlockable 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" according 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 hazardous 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
Tab.2 - Fig.4
Note: Minimum creepage and clearance distances that shall be maintained to conductive parts or
other live parts are:
MP39685
Minimum cross-sectional
area of the corresponding
protective conductor, Sp mm
2
S
16
0,5 S
Pitch Torque Nm
10 mm 1.2
11 mm 1.2
13 mm 2
18 mm 2.5
Minimum creepage
250 V 6,3 mm
400 V 10 mm
500 V 12,5 mm
630 V 16 mm
800 V 20 mm
1000 V 25 mm
Table 3 – Creepage and Clearance
Note: Voltages are nominal voltages – the working voltage may exceed by 10% the voltage level given.
3.3.2 Maximum Power Dissipation
Tab.4a/4b
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.
> 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 and blanking plug
elements 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
Tab.5
3.7 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.
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. IEC 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. IEC 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 closed.
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 -50°C to +70°C for products with minimum ambient temperature -50°C.
Storage Temperature : from -60°C to +70°C for products with minimum ambient temperature -60°C.
Relative Humidity : ≤95%RH
The estimated product lifetime is 10 years if maintenance and storage condition are respected and all
prescriptions 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.
6
Minimum clearance
250 V 5 mm
400 V 6 mm
500 V 8 mm
630 V 10 mm
800 V 12 mm
1000 V 14 mm
ZP90805-5