Unit 12. Wiring Systems and Glands Flashcards
1.
What is the correct glanding procedure (to meet minimum requirement) when terminating a SWA cable into a plastic Ex e enclosure with clearance holes and no internal earth continuity plate?
Fit gland, external IP washer and internal locknut.
Fit gland internal star washer and locknut.
Fit gland, earth tag, external IP washer and internal locknut.
Fit gland, earth tag and internal locknut.
Fit gland, earth tag, external IP washer and internal locknut.
2.
If using aluminum conductors the minimum cross-sectional area should be?
25mm
4mm
16mm
2.5mm
16mm
3.
Which of the following is a preferred colour for identifying IS cables?
Red
Light Blue
Black
Green
Light Blue
4.
An Ex d IIC, direct entry enclosure with a free internal volume of 1 litre is installed in an area requiring EPL Gb IIB equipment, what is the minimum acceptable cable gland required if we’re using SWA with extruded bedding?
Ex d IIC barrier gland, BARR-W gland.
Ex e IIC cable gland, E1We gland.
Ex d IIC gland, E1WF
Uncertified gland, E1W
Certified E1WF, Ex d IIC cable gland
Because the Enclosure is installed within a Gas Group IIB Area the Gland only requires to a certified to E1WF Ex d IIC cable gland and a barrier gland does not need to be installed.
Gland Markings
A. Outer Seal only
A2. Unarmoured cable with outer seal.
B. Armour lock only.
BW. SWA cable without seal, indoor use.
BARR. Inner barrier seal, outer seal, and armour lock.
C. Outer Seal with armour lock.
CR-C Double compression, barrier gland, SWA, braided cable (Croclock)
CW. Single seal, SWA, outdoor use.
CX. Single seal, braided cable.
D. Inner seal and armour lock.
E. Double seal.
E1W. Double seal, SWA cable, indoor / outdoor.
E1X. Double seal, braided cable indoor / outdoor.
F. Multiple certification.
IE. Integral earth.
L. Lightweight design.
R. Reduced bore size.
T. Pliable wire armour, flexible cables.
W. Steel wire armour (SWA).
X. Wire braid
Y. Aluminium strip wire.
Z. Double steel tape armoured.
E1WF.
Double Seal, SWA, multiple certification
E1W
Double Seal, SWA
E1We
Double Seal, SWA, inner cable seal and outer cable seal.
BARR-W
Barrier gland, SWA or Tape bedding.
5.
How should the unused cable cores of multi-core cables be terminated?
Connect to the neutral conductor.
Cut back and secure the ends with insulating tape.
Terminate in unearthed terminals.
Tape up the conductor ends and identify as spare.
Terminate in unearthed terminals.
6.
What is the correct glanding procedure (to meet minimum requirement) when terminating a SWA cable into a steel Ex e enclosure with clearance holes?
Fit gland, internal star washer, and locknut.
Fit gland and internal locknut.
Fit gland, external IP washer, internal star washer and locknut.
Fit gland, internal IP washer, star washer and locknut.
Fit gland, external IP washer, internal star washer and locknut.
7.
What is the correct glanding procedure (to meet minimum requirement) when terminating a SWA cable into a steel Ex e enclosure with a 10mm threaded entry?
Fit the gland.
Fit gland, external IP washer, internal star washer and locknut.
Fit gland, external IP washer and internal locknut.
Fit gland, internal IP washer and locknut.
Fit the gland.
8.
Cables, for non-IS circuits, in hazardous areas that are sheathed in thermoplastic, thermosetting or elastomeric materials may be used provided they are?
Flat, compact, have extruded bedding and fillers.
Circular, compact, have extruded bedding and fillers, if any, are non-hygroscopic.
Circular, compact, have extruded bedding and fillers.
Circular, compact, have extruded bedding and fillers, if any, are non-conducting.
Circular, compact, have extruded bedding and fillers, if any, are non-hygroscopic.
9.
Separation of the strands of cable cores may be prevented by?
Soldering.
Using crimp lugs or core end sleeves.
Twisting the strands.
Soldering or fitting cable lugs.
Using crimp lugs or core end sleeves.
GLAND SELECTIONS
FOR GUIDANCE
Gland available types for selection as part of Compex Refresher Course.
A2 Ex d Non-armoured A2 Ex e Non-armoured A2 IP66 Uncertified non-armoured. E1W Ex d armoured E1W Ex d Barrier armoured E1W Ex e armoured IP66 Uncertified
IP Washer, Serrated Washer, Lock Nut
Required
Not Required
Threaded Adaptors
Not Required
NPT/20mm
NPT/20mm and Paste
Blanking Elements Ex d Ex e IP66 uncertified Not Required
The requirements of earthing at gland is required for Earth armour of cable and not required to Earth the gland when unarmored cable installed.
Armoured or Braided Cables,Plastic enclosure with internal earthing plate requires a serrated washer and locknut.
Armoured or Braided Cables, Plastic enclosures with no internal earthing plate requires an earthing ring.
Cannot be marked wrong for selecting an Ex d gland. An Ex d gland has a higher level of protection than an Ex e gland.
Cannot be marked wrong for selecting an Ex d Blanking Plug as Ex d Blanking Plug has a higher level of protection than an Ex e Blanking Plug
Can use Ex d glands and Blanking plugs in Ex e equipment.
Threaded Adaptors: Paste is Required if the Area has a higher IP Rating of IP54
IP washer required if Area IP rating is more than IP54.
IP washer not required if the
Area IP rating is less than IP54,
IP washer not required when cable entry length is 6mm or more.
Special type of IP washer, (steel and rubber washer) is required for Ex nR enclosures.
Serrated washer and locknut required on Metal Enclosures, Armoured Cable, with a cable entry less than 6mm.
Serrated washer and locknut required on Plastic Enclosures, Armoured Cable, If enclosure fitted with internal continuity plate.
Earth tab required on Plastic Enclosure, armoured cable if enclosure has no internal earth continuity plate.
Locknut required when cable entry is less than 6mm
