cable_glands_en.qxp :25 Uhr Seite 3 cable glands

Transcription

1 cable glands

2 2 The main focus of our business is on the safety of our customers during their day-to-day work. For over 80 years now, we ve been leading the way in the explosion protection sector in achieving this goal. Development of explosion protected, electrical control devices and control units increased continuously and successfully as of Pioneering new developments and innovative products are the results of this success. R. STAHL specialists have been working actively for many years now in national and international committees to define new standards and better safety regulations. R. STAHL presented the EXLUX 6000 explosion protected series of strip lighting units in The company quickly became a leading supplier to the world market in the lighting sector. In 1993, three independent fieldbus systems from the R. STAHL company were used on an offshore drilling platform near the coast of Norway. What was then the company s largest fieldbus project required customer-specific, innovative solutions and a high quality engineering share. R. STAHL s remote I/O System IS1 was introduced in the year 2000 making a decisive step into the new millennium and gearing for the future. Today, it is an important element of the company s new fieldbus solutions. Then as now, safety standards did not pose a barrier to us but represented a challenge. We not only comply with all standards, but are generally also involved in helping to create these standards and set new ones. As a result, R. STAHL numbers among the leading suppliers of explosion protected components and systems for measurement, control, instrumentation, power distribution, operator control and observation, besides lighting, worldwide. This in turn results in our offer of all-in services to the explosion protection sector.

3 your safety -our reality 3 Spoilt for choice 5 Application guide 6 Ex e cable glands 8 Ex d cable glands 10 Triple certified 12 TRITON CDS 14 Accessories 16

4 cable_glands_en.qxp :25 Uhr Seite 6

5 application guide Before cable gland products can correctly be selected to suit the user s application, there are a number of variable factors that need to be determined. Without this information it is difficult to make an accurate selection or recommendation. Some of these factors may include location, installation code of practice, environmental conditions, industrial or classified hazardous area, type of equipment and details of the cable to be used. Here are some general guidelines that may help to identify the appropriate cable gland product to suit your situation. General cable gland selection guidelines > determine conditions of use, i.e. industrial, hazardous area. > determine environmental conditions > determine type of cable, armoured or non-armoured > determine type of armour and thickness, where applicable > determine cable overall diameter > determine cable inner bedding diameter, where applicable > determine enclosure type and configuration > determine whether there is any potential for the coupling of dissimilar metals (e.g. brass and aluminium) > determine entry hole type and size > determine any access limitations or space restrictions > determine any special earthing or EMC requirements > determine accessories required, where applicable > if Ex nr, restricted breathing enclosure, does the cable directly enter the main enclosure > entry hole type, drilled and tapped (threaded) or clearance hole > entry hole thread form and size Once the above information has been identified, the person carrying out selection is more able to make an informed decision about which product should be used from the choices available. Please note that selection and installation should be carried out in line with good engineering practice, observing the requirements of the prevailing code of practice (e.g. IEC ), and in accordance with the instructions provided. IEC requires that the selection and installations of equipment shall be carried out only by competent persons whose training has included instruction on the various types of protection and installation practices, relevant rules and regulations and on the general principles of area classification. The competency of the person shall be relevant to the type of work to be undertaken. If the cable glands are intended for use in flammable atmospheres (hazardous areas), the following additional points may help your selection process: > what is the protection method of the equipment, e.g. Ex d, Ex e, Ex n > which gas group is the equipment rated for service in IIA, IIB or IIC > if Ex d, is the cable directly entering the main enclosure > if Ex d, is there a source of ignition inside the enclosure > if Ex d, is the enclosure volume less than or greater than 2000 cm 3 > if Ex n, is the enclosure a restricted breathing (Ex nr) enclosure

6 Typical cable types with corresponding metal cable gland types IEC cables Onshore Oil, Gas and Petrochemicals specific cable type single seal double seal compound barrier unarmoured A2F SS2K PXSS2K S.W.A. (single wire armour) CWe or C2K E1FW or E1FU PX2K L.C./S.W.A (lead sheathed and single wire armour) E2FW or E2FU PX2KPB A.W.A. (aluminium wire armour) CWe E1FW or E1FU PX2K A.S.A. (aluminium strip armour) C2K E1FU or T3CDS PX2K S.T.A. (steel tape armour) C2K E1FX/Z or E1FU PX2K L.C./S.T.A (lead sheathed and steel tape armour) E2FX/Z or E2FU PX2KPB L.C./GSWB (lead sheathed and braid armour) E2FX/Z or E2FU PX2KPB wire braid armour (SWB, GSWB, CWB, TCWB or BWB) CXe or C2K E1FX/Z or E1FU PX2K screened (braided) flexible e.g. CY/SY Controlflex CXe or C2K E1FX/Z or E1FU PX2K IEC cables Offshore Oil and Gas specific cable type single seal double seal compound barrier unarmoured A2F SS2K PXSS2K wire braid armour (SWB, GSWB, CWB, TCWB or BWB) C2K T3CDS PX2K screened (braided) flexible e.g. CY/SY Controlflex C2K T3CDS PX2K S.T.A. (steel tape armour) C2K T3CDS PX2K Of course the cable type plays a significant part in the cable gland selection, but other important factors must also be carefully considered. Selection table hazardous area cable glands (CENELEC approved) type protection cable type generic cable type specific sealing method I.P. rating 8161 Ex e unarmoured S.W.A. (single wire armour), braid armour outer seal IP66, IP68 T3CDS E1FU E1FW E1FXZ E2FU E2FW CUe C2K CWe CXe A2F SS2K PX2K PXSS2K Ex e, Ex d armoured (universal) S.W.A. (single wire armour), braid armour (SWB, GSWB, CWB, TCWB or BWB) Ex e, Ex d armoured (universal) S.W.A. (single wire armour), braid armour (SWB, GSWB, CWB, TCWB or BWB) inner and outer seal with deluge seal inner and outer seal Ex e, Ex d armoured S.W.A. (single wire armour) inner and outer seal IP66 Ex e, Ex d armoured braid armour (SWB, GSWB, CWB, TCWB or BWB) inner and outer seal IP66 Ex e, Ex d armoured lead sheated (universal) L.C./S.W.A (lead sheathed and single wire armour), L.C./S.T.A (lead sheathed and steel tape armour) inner and outer seal Ex e, Ex d armoured lead sheated L.C./S.W.A (lead sheathed and single wire armour) inner and outer seal IP66 Ex e armoured (universal) S.W.A. (single wire armour), braid armour (SWB, GSWB, CWB, TCWB or BWB) Ex e armoured (universal) S.W.A. (single wire armour), braid armour (SWB, GSWB, CWB, TCWB or BWB) outer seal outer seal with deluge seal Ex e armoured S.W.A. (single wire armour) outer seal IP66 Ex e armoured braid armour (SWB, GSWB, CWB, TCWB or BWB) outer seal IP66 IP66, IP67, IP68 IP66 IP66 IP66 IP66, IP67, IP68 Ex e, Ex d unarmoured unarmoured outer seal IP66, IP67, IP68 Ex e, Ex d unarmoured unarmoured double outer seal IP66, IP67, IP68 Ex e, Ex d armoured (universal) S.W.A. (single wire armour), braid armour (SWB, GSWB, CWB, TCWB or BWB) outer seal/compound barrier with deluge seal Ex e, Ex d unarmoured unarmoured outer seal/compound barrier Please note that limitations or special conditions of safe use may be applicable to cable gland applications in accordance with IEC For further assistance in the selection of cable glands please refer to pages 12 and 13. IP66, IP67, IP68 IP66, IP67, IP68

7 spoilt for choice 5 R. STAHL offers electrical installation material and cable connecting solutions with a variety of approvals from internationally recognised certification bodies, including ATEX, IECEx and many others. R. STAHL, the market leader in explosion protected material, offers a range of cable glands for use with armoured and non-armoured cables, suitable for use in hazardous areas, classified under IEC , in both metallic and non-metallic configurations. These cable glands have been designed and constructed in accordance with BS6121 and EN50262, although the former established the more onerous requirement, and are certified as fully compliant with the very latest EN and IEC standards EN/IEC series. With this approach, there are no special seal materials required to suit typical low or high temperature situations, and two or more alternative seals to suit each cable gland s sealing range are not required. Consequently there are no special order requirements necessary for the majority of project applications around the world. The certified cable gland sizes on offer range from the regular M20 to the impressive M130. Using the same consistent design concept this range stands proud amongst the rival offerings available on the market. Quite simply R. STAHL gives you every possible combination of options that you could imagine.

8 ex e cable glands Series 8161 Increased safety Ex e non metallic indoor and outdoor cable glands with metric threads for use in Zone 1, Zone 2, Zone 21 and Zone 22 hazardous areas with all types of unarmoured cables. Its superior sealing technique ensures a highly effective and reliable high integrity solution. Suitable for use in conjunction with increased safety Ex e apparatus or flameproof Ex de equipment which has an increased safety Ex e terminal chamber. For Intrinsic Safety Ex i, a version with blue cap nut is available. Series HSK Increased safety Ex e bell mouthed cable glands are available in brass or plastic/aluminium with metric threads for use in Zone 1, Zone 2, Zone 21 and Zone 22 hazardous areas with all types of unarmoured cables. Because of their construction the cable glands are suitable for portable equipment. Series 8163 Increased safety Ex e metallic cable gland for onshore and offshore applications with metric threads for use in Zone 1, Zone 2, Zone 21 and Zone 22 hazardous areas with all types of armoured cables.

9 4 5 9 Series 8161 > Intrinsic safety (Ex i) version available > IP 66 > as single or multi-cable entry > integrated plug (accessory) for closing unused cable entries 1 3 Series -C2K Series HSK-MZ bell mouthed cable glands in metal Ex e > IP 68 > for portable equipment Series HSK-K-MZ 2 bell mouthed cable glands in plastic/aluminium Ex e > IP 68 > for portable equipment cable glands Ex e for all types of armoured cable > suitable for use with offshore and onshore cables, with outer seal > incorporating internal deluge seal for arduous conditions > reversible armour clamping cone and uni-fit clamping ring Series -CWe 5 cable glands Ex e for SWA cable with outer seal > suitable for use with onshore cables Series -CXe cable glands Ex e for wire braid armour cables with outer seal > suitable for use with onshore cables 4

10 10 ex d cable glands selection Cables come in a wide variety of shapes and sizes, and new designs are regularly being introduce. For example, ones with optical fibres. The issue of correctly sealing these cables as they enter hazardous area electrical equipment is a worldwide problem, and not confined purely to local conditions. Although there are no IEC construction standards for the cables intended for use in flammable atmospheres, according to IEC if a cable gland with an elastomeric flameproof seal is to be used, the cable should > be substantially compact and circular (i.e. especially the part of the cable entering the enclosure) > have an extruded bedding (without any gaps) > have fillers, if any are used, which are non-hygroscopic. Effectively, the cable must be assessed to verify its suitablity to prevent gas penetration and migration along its length, as well as its ability to prevent explosion transmission through the cable, before any cable gland with an elastomeric seal can be selected. Beyond this other exceptions still exist. The IEC installation code of practice IEC is very clear about the selection of cable glands for use with Ex d enclosure types. Cable Gland Selection according to IEC Regarding the subject of cable glands to maintain integrity of type of protection flameproof enclosures Ex d using direct cable entry into the flameproof enclosures, special selection criterions have to be considered as defined in Section 10 of IEC Standard IEC Electrical apparatus for explosive gas atmospheres Part 14: Electrical installations in hazardous areas (other than mines). In order to achieve compliance with the prevailing Code of Practice, and in particular IEC , it is necessary to evaluate the function of the equipment, the cable gland, and the cable. Furthermore, in order to satisfy the conditions of the applicable standards compatibility of all three with each other must also be verified. Section 10 of IEC Additional requirements for type of protection Ex d Flameproof enclosures regarding the selection of cable glands must be followed. Specific rules to ensure integrity and safe operation of the installed equipment are also set out here.

11 11 If the cable gland is not certified as part of the equipment but tested and certified as a separate component, and the used cable is substantially compact and circular the selection chart can be used > if the cable is not round in appearance, or visually appears to allow air to pass through its interstices because the cable construction is not adequately filled, then a compound barrier type cable gland could be selected. > in the case of flameproof enclosures Ex d, the function of the elastomeric sealing ring, which is applied to the section of the cable entering the equipment is to provide a gas tight seal around the cable bedding and prevent explosion from penetrating the cable sealing point so that the explosion cannot be transmitted to the external atmosphere. > if the cable is not round, it is not possible to rely upon an elastomeric seal to perform a sealing function around the cable sheath. An example of a cable that fits this scenario is a twisted pair instrument cable where the insulated conductors beneath the inner cable bedding do not usually offer a round (circular) surface on which to seal. If the inner bedding follows the same shape, then an elastomeric seal may struggle to seal effectively around the cable circumference. The effect is often more noticeable with single pair cables, and it may be necessary to fit a compound sealing barrier type cable gland to overcome the situation, depending upon the form of protection and cable entry configuration of the apparatus enclosure. > equally, if the cable is not adequately filled, and allows the passage of air or gas along the cable length, then there would be no protection to the inner part of the cable when an elastomeric sealing ring is used. In this case a compound barrier type cable gland is the only safe solution, and is necessary in order to maintain the integrity of the equipment and prevent gas migration between equipment or between hazardous areas and safe areas.

12 12 triple certified exd,exe,exnr The series hazardous area metallic cable glands are available for non-armoured, and all types of armoured and braided cables. They fulfil all of the requirements of the European ATEX-directives and fully comply with the latest IEC standards. series cable glands are available in single seal and double seal orientations, and the double seal cable glands incorporate a displacement seal on the cable inner bedding. Their modular design and wide cable acceptance range allows a broad variety of cables to be terminated in a single cable gland without the need for alternative seals or clamping arrangements to be ordered. In addition to normal sealing of the cable sheath, secure clamping of the single wire armouring is essential as this armouring is used, not only for mechanical protection, but also contributes to the electrical protection. In the event of an earth fault, the armouring acts as an earthing conductor, and the earth continuity system is maintained via the cable gland. According to IEC :2004, when intended for use with braided type cables, the cable gland outer seal must also provide cable retention under tensile load conditions without the braid being clamped. R. STAHL s series cable glands are certified in accordance with this requirement. These cable glands are intended for use with Ex equipment and are provided with triple certification Ex d, Ex e and Ex nr, making them suitable for use with flameproof (type d), increased safety (type e) and restricted breathing/non-sparking (type nr/na) enclosures.

13 inner seal housing reversible armour cone uni-fit armour clamping ring body and outer seal housing modular design 13 Series -A2F (offshore and onshore) Ex d, Ex e and Ex nr for unarmoured cables Series -E1FXZ (onshore) Ex d, Ex e and Ex nr for wire braid and STA cables with inner and outer seal Series -E1FW (onshore) Ex d, Ex e and Ex nr for SWA cables with inner and outer seal Series -E1FU (onshore) Ex d, Ex e and Ex nr for all types of armoured cables with inner and outer seal Series -E2FW (onshore) Ex d, Ex e and Ex nr for lead sheathed SWA cable with inner and outer seal Series -T3CDS (offshore and onshore) Ex d, Ex e and Ex nr for all types of armoured cables with inner and outer seal > incorporating internal deluge seal for arduous conditions > reversible armour clamping cone and uni-fit clamping ring ensuring right first time cable termination > unique compensating displacement seal (CDS) system used on the cable inner bedding Series -PXSS2K (offshore and onshore) Compound barrier glands Ex d and Ex e for all types of unarmoured cables Series -PX2K (offshore and onshore) Compound barrier glands Ex d and Ex e for all types of armoured cables Series -E2FU (onshore) Ex d, Ex e and Ex nr for all types of armoured and lead sheathed cables with inner and outer seal

14 14 triton cds exd,exe,exnr TRITON CDS delivers a unique concept in cable sealing techniques incorporating the compensating displacement seal system, CDS. Introduced to effectively handle all types and sizes of cable construction reducing worry for the operator and letting the product do the job. This concept provides effective sealing on the cable inner sheath, utilising a proven reliable and robust flameproof sealing device installed with a best in class manner. Taking a crucial cable care principal into account in its design, this concept leaves nothing to chance yet delivers the ultimate in assembly and installation simplicity. This guarantees a safety level that is unsurpassed by any other cable gland available. Because of the presence of the CDS sealing system, during installation the cable gland is fully tightened metal to metal every time regardless of cable diameter. A reliable O ring arrangement, which is concealed and protected from damage after installation and during service, fulfills this role. The T3CDS series TRITON CDS is also triple certified Ex d, Ex e and Ex nr, and additionally provides deluge protection with extra deluge test approval to DTS 01:91. Continuous operating temperature ranges from 60 C to +130 C.

15 inner seal housing deluge seal inner seal housing deluge seal CDS compensator CDS compensator When a larger diameter cable is installed, the inner compensator is effected to a greater extent When a smaller diameter cable is installed, the inner compensator is effected to a lesser extent 15 Inner seal housing > robust explosion proof CDS system, less susceptible to damage than equivalent diaphragm seals. > no need for cable guide to protect CDS system as cable conductors do not penetrate or damage the explosion proof seal as they pass through it. > flameproof seal does not tear or split as a result of frictional rotation during installation. > flameproof inner seal remains in the cable gland, and does not ride on the cable, and therefore is not prone to mechanical damage when the cable needs to be withdrawn from the equipment. > remote take off, disconnection and re-connection does not jeopardise the safety integrity of the Ex apparatus. > inspection can be affected without disturbing the inner seal. Deluge protection seal > deluge protection by means of tried and tested O ring feature simple and effective arrangement. > internal deluge seal is not exposed to mechanical damage or ultraviolet radiation after installation and is completely protected in its operational working life, offering total reliability. > There is no need to pull or re-position the deluge seal on installation or subsequent re-assembly after inspection, as the R. STAHL O ring arrangement engages automatically during a simple installation procedure providing effective protection every time.

16 accessories A range of accessories and thread conversion adaptors and reducers are offered to compliment the series cable glands. These include locknuts, serrated washers, sealing washers, earth tags and shrouds. Locknuts are recommended to secure cable glands, unions, adaptors, reducers, and stopper plugs to a gland plate or into equipment. Serrated washers fitted internally to the equipment and before a locknut act as an anti-vibration device to prevent the cable gland or other cable entry device and locknut arrangement from inadvertently loosening in service. Entry thread sealing washers fitted at the equipment interface are fitted to maintain the ingress protection level of the equipment. For explosion protected equipment it is essential to maintain the integrity of the degree of ingress protection at which the equipment has been rated. Slip on earth tags installed between the cable gland and equipment, provide an earth bond connection as specified in BS6121:Part 5:1993 and also comply with category B rating as specified in BS EN A range of push on shrouds, which are used to minimise the risk of dirt or foreign substances gathering on the cable gland body, and/or point of cable to gland interface are also available. Standard shrouds are produced in black PVC. Thread conversion adaptors and reducers are available that convert the cable gland to a different thread type, or enlarge or reduce the threaded connection between the equipment entry hole and the cable entry device.

17 red plugs 3 The plugs are for closing unused cable entries of series stopping plugs 4 > in moulded plastic > in metal conductor bushings Ex d 8 The conductor bushings are Ex-components, which provide the connection between electrical equipment within an enclosure and external circuits. They are flameproof and form when fitted into a flameproof enclosure an ignition- and explosion-secure seal. breathing glands > in moulded plastic > in metal 1 post type bushings Ex d 5 The feed-through connectors provide a flameproof electrical connection between two flameproof enclosures or one flameproof enclosure and a connection space with a different explosion protection type. accessories > locknuts 6 > earth tags > sealing washers > serrated washers > flat washers > shrouds > enlargements, reducers in moulded plastic > adapters and reducers in metal 2 > earth conductor bushings Ex e 7 2

18 VISUELL, Stuttgart R.STAHL Schaltgeräte GmbH Am Bahnhof 30, Waldenburg, Germany Telephone Fax ID-NR S-PB-Cable glands-00-en-03/2007 Printed in Germany