Many types of flame-resistant cable exhibit "cold flow" of the inner sheath bedding, which could have adverse effects on the protection of the apparatus.
Where such cable is used, it is a requirement of EN 60079-14 and IEC 60079-14, clause 10.2 to employ a suitable cable entry device. The code of practice clearly states that "a cable gland employing a compression (displacement) seal should not be used on cable exhibiting cold flow characteristics".
"Cold flow" can be more fully described as thermoplastic materials which flow when subjected to pressure at ambient temperature, i.e. the inner sheath bedding material will flow away from any pressure applied to it, including that of a cable gland inner seal of the compression or displacement type, the effect being that there may no longer be an effective seal on the inner sheath of the cable.
Outdoor or indoor use.
For particular use with:-
a) Cable inner sheaths that are not effectively filled, compact and/or circular, have tape bedding or have hygroscopic fillers.
b) Cables that exhibit ‘cold flow’ characteristics.
c) Enclosures for gas group IIC, under 2 litres in volume and containing an ignition source.
d) Enclosures for gas groups IIA or IIB, which are greater than 2 litres in volume and contain an ignition source.
Provides a barrier seal between the individual insulated cores within the cable and prevents entry of the products of an explosion into the cable.
The required number of holes for the cores are punched in the seal by means of a special tool to suit the core size.
Provides female running coupler for cable gland or conduit entry.
The SB 474 cable gland is manufactured in Brass (standard), Nickel PlatedBrass, 316 Stainless Steel or Aluminium. Brass NPT entries are nickel plated as standard.
|CABLE GLAND SELECTION TABLE|
|All dimensions in millimetres (except * where dimensions are in inches).
Metric entry threads are 1.5mm pitch as standard.
# NPT female thread sizes equivalent to those shown in the table for the male thread size are available. Hexagon dimensions as shown may alter.
|CABLE GLAND SIZE FOR CORE SIZE & NUMBER|
|Cores Cross Sectional Area mm²|
|7||A & B||A & B||B & C||C||C|
|PUNCH TOOL SIZE DETAILS|
|Core C.S.A. mm2||1.5 - 2.5||4.0 - 6.0||10.0|
Example: SB 474 / C / M32 / M32 / Brass / Punch Tool No.1
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