Sierra Instruction Manual ATEX Certified Units: 640S-EEX & 780S-EEX
Page 13 of 15
12. Ensure Seal makes full contact with cable sheath, then tighten Back Nut 1 extra turn
X
INSTALLATION HOLE DATA (See drawing)
Xa
Diameter C for clearance holes (NOT EExd)
Xb
Diameter C countersink for threaded holes (EExd)
Xc
Diameter O of O-ring seal
X Hole data (see
Cable Sizes (mm), Armour Acceptance (mm) & Assembly Torques (Nm)
NOTE:-** Type 3 seals only to 11.0mm diameter
overleaf)
Gland
Size
Torque
Settings
Inner Sheath
Outer Sheath
Reduced
Bore
Armour Acceptance Ranges
Dia Xc
Dia
Xa/Xb
Min
Max
Min
Max
Min
Max
Wire
Tape Armour
Woven steel
wire
18.5
16.5
16
32.5
3.5
8.4
8.4
13.5
4.9
10.0
0.9
0.15
0.35
0.2
0.3
Installation Guidance
Point
Advice
1
♦
BS EN 60079-10
Classification of Hazardous Areas ♦ BS EN 60079-14 Electrical Installations in hazardous areas (other than mines) ♦ BS
6121, Part 5 Selection, Installation and Maintenance of Cable Glands
2
Installation should only be carried out by a competent electrician, skilled in cable gland installation.
3
NO INSTALLATION SHOULD BE CARRIED OUT UNDER LIVE CONDITIONS.
4
To maintain Ingress Protection ratings above IP54, use IP washers or O-rings for parallel threads. For taper threads use thread sealant. Also see
page 1 diagram and Hole Data above.
5
The surface of the enclosure should be sufficiently flat and rigid to make both the IP joint, and earth contact where needed. With painted
enclosures, a star washer should be fitted to break through the paint and make a satisfactory earth contact.
6
Once installed do not dismantle except for occasional inspection. If necessary, dismantle by reversing the Fitting Instructions given above. The
gland is not serviceable and spare parts are not supplied.
7
Parts are not interchangeable with any other design. If manufacturers' parts are mixed, certification will be invalidated.
Limitations on Usage.
Be sure your installation complies with the following:
Feature
Comment
Enclosure entry
thread
The female thread in the enclosure must comply with clause 5.3 of EN 50018, or clause 5.3 of IEC 79-1, as appropriate. Do not
damage threads on assembly. Check the number of full turns of thread engaged is at least 5.
Cable construction
The glands should only be used with substantially round and compact cables with extruded bedding (i.e. effectively filled cables).
Installation conditions
Gas Group?
Internal Ignition Source?
Enclosure Volume?
Which Zone?
Use Type E**F/D**F
Gland?
IIC
NO
2 litres or less
Zone 1 or 2
YES
IIB, IIA, II
NO
Any
Zone 1 or 2
YES
IIB, IIA, II
YES
Any
Zone 2
YES
IIB, IIA, II
YES
2 litres or less
Zone 1
YES