6. Cable Glands

Selection of a proper, Hazardous Area Complied Cable Gland is an important factor. The normal working and safety of the Junction/Terminal boxes, control stations and all electrical devices comprising the electrical network in the Hazardous Area depend, among other factors upon the installed Cable Gland.

Hazardous Area Experience and proper respective trainings are, of course the prerequisites for the concerned design engineer.

IEC 60079-14 -Edition 6  gives a table for the selection of Glands (IEC is using a general term “cable entry devices”) according to protection techniques , as given in different sections of the same standard.

(Reference : IEC 60079-14  Edition 6-Table 15)

 

---

---

 Additional Requirements for Flameproof Enclosures : Ex d

---

If the manufacturer’s instructions and/or Ex equipment certificate do not identify the type of cable entry device then the cable entry system shall comply with one of the following:

a) cable entry devices which seal around individual conductors (barrier cable entry devices) in compliance with IEC 60079-1, and having an Ex Equipment certificate;

 or

b) cable entry devices having an Ex Equipment certificate and complying with IEC 60079-1, and selected in accordance with the following flow chart:

c) Indirect cable entry using combination of flameproof enclosure with a bushing and terminal box utilizing a different Type of Protection;

 or

 

d) mineral-insulated metal-sheathed cable with or without plastic outer covering with appropriate flameproof cable entry device, having an Ex Equipment certificate and complying with IEC 60079-1;

or

e) flameproof sealing device (for example a sealing chamber) specified in the Ex Equipment documentation or having an Ex Equipment certificate and complyingwith IEC 60079-1 installed together with a cable entry device appropriate to thecables used. The sealing device shall incorporate setting compound or otherappropriate seals which provide a seal around individual conductors. The sealing device shall be fitted between the cable entry device and the point of entry of cables to the Ex Equipment

Cable entry device for type of Protection “nR”

The selection of cable entry devices for restricted-breathing “nR” enclosures shall be such as
to maintain the restricted-breathing properties of the enclosure. Where the cable used is not part of the Ex Equipment Certificate or manufacturer’s instructionand is not effectively filled, it might be necessary to use a cable entry device or other method (for example resin joint, shrinking tube) which seals around the individual conductors of the cable to maintain the restricted breathing characteristics of the enclosure. The interface between the cable entry device and the enclosure shall be sealed according to the information contained in the Ex Equipment certificate or manufacturer’s instructions for the Ex Equipment enclosure. Tapered threads will require the use of a suitable grease or thread sealant. (IEC 60079-14)

---

top