IEC 60702-2 pdf download – Mineral insulated cables and their terminations with a rated voltage not exceeding 750 V — Part 2: Terminations
3.3gland
part of a termination designed to secure the cable in a cable entry. It may or may not be usedto ensure earth continuity depending upon the type of construction and material used
3.4
type tests (symbol T)
tests made before supplying, on a general commercial basis, a type of termination covered bythis standard，in order to demonstrate satisfactory performance characteristics to meet theintended application.These tests are such that, after they have been made, they need not berepeated unless changes are made in the termination material,design or manufacturingprocess which might change the performance characteristics
4Marking
4.1 Marking of packages
Packages in which terminations or parts of terminations are supplied shall be marked with thefollowing particulars:
a) the number of this standard;
b) a means of identifying the manufacturer or supplier;
c) the maximum and minimum operating temperature of the seals;d) a mark or means of identifying the cables for which it is intended;e) whether a protective conductor is provided;
f)gland thread form and size.
4.2Marking of seals and glands
Seals and glands shall be marked with a means of identifying the cable or cables for whichthey are intended. In addition, glands certified for use in hazardous areas shall be marked inaccordance with lEC 60079-o.
5Construction
5.1Seals
5.1.1 Material
A seal shall consist of a moisture-resistant sealing material contained， if necessary,within asuitable enclosure, and shall provide electrical insulation for the cable conductors.
5.1.2Connection
A protective conductor may be connected to a metallic sealing enclosure by any suitablemethod(e.g. welding, brazing, crimping or soldering), or it may be connected directly on themetal sheath by any suitable attachment (e.g. clip or clamp). The size of the protectiveconductor shall be in accordance with lEC 60364-5-54,and the attachment shall meet theelectrical continuity test requirement specified in 6.4.1.
5.1.3 Explosive atmospheres
A seal for use in potentially explosive atmospheres shall, in addition to complying with therequirements of this standard, also satisfy the appropriate requirements specified in iEC 60079-0.
5.1.4Corrosion resistance
A seal or enclosure shall be made from material which will ensure freedom from corrosionarising from electrolytic action.
5.1.5 Test requirements
The material used in the seal shall be such that the completed seal is capable of meeting thetest requirements specified in this standard.
5.1.6Operating temperature
The conductor insulation shall be suitable for the range of operating temperatures stated forthe seal by the manufacturer.
5.2Glands
5.2.1 Material
A gland may be of any suitable material providing that it ensures freedom from corrosionarising from electrolytic action and meets the test requirements specified in this standard.
5.2.2Thread form
The gland entry threads shall have a preferred thread form in accordance with those specifiedfor conduit in iEC 60423.Other threads are permitted provided that the gland complies withall the other requirements of this standard.
5.2.3 Entry thread length
The length of gland entry threads shall be not less than 8 mm.5.2.4Explosive atmospheres
Glands for use in potentially explosive atmospheres shall， in addition to complying withthe requirements of this standard, also satisfy the appropriate requirements specified inlEC 6o079-o.
6 Type tests6.1General
The tests in this standard are type tests intended to establish termination design charac-teristics. Unless otherwise specified, all tests shall be carried out at an ambient temperatureof (20土10)°c.
IEC 60702-2 pdf download – Mineral insulated cables and their terminations with a rated voltage not exceeding 750 V — Part 2: Terminations
