Cable Glands - Scame ZENITH-P Serie Manual De Instrucciones

tool and torque (see manufacturer documents) for tightening the
terminal clamps (screwdriver or spanner). Creepage and clear-
ance distances shall comply with IEC EN 60079-7 (table 3), cur-
rent 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 ter-
minals 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 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.

3.5 Cable Glands

Use only Ex e and/or Ex t IIIC approved glands (as relevant). Cer-
tified cable glands can only be fitted with a suitable IP rating com-
mensurate 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.
3.5.1 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.
3.5.2 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.
3.5.3 Maximum Cable-Entries
Table 5 - Standard entry arrangements
3.6 Commands, Controls and Signalling components
- All components (actuators, switch and signalling elements)
have ATEX / IECEx separate certificates. Installation and main-
tenance shall be done as prescribed by manufacturer docu-
ments.
- 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.
- Creepage and clearance distances shall comply with EN 60079-
7 (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.
3.7 Drain / Breathing valves
Drain/breathing valves have ATEX / IECEx separate certificate. In-
stallation and maintenance shall be done as prescribed by man-
ufacturer documents.
IP rating of drain/breathing valves fitted shall be suitable with the
IP rating of the enclosure.
3.8 Instruments
- All measuring instruments have ATEX / IECEx separate certifi-
cates. 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
9 ZP90869-3