London Underground - Section 12 approved Switch Disconnectors
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1 Introduction Following the Kings Cross fire of 1987, the resulting Fennell enquiry prompted the introduction of additional fire precautions for Sub-surface Railway Stations. These additional requirements were introduced under section 12 of the Fire Precautions Act 1971, and since then have been known simply as Section 12 regs. The forensic report on the fire sited several instances of a flash over effect caused by materials and paint finishes being ignitable. Exacerbating the conditions underground were toxic fumes given off by certain materials being excessively heated. Although the new regulations dealt with all aspects of fire prevention such as the removal of wooden escalators, the installation of heat detectors, improved staff training etc, as far as actual equipment supplied for underground use, the overriding emphasis was on materials and paint finishes. With this isolation range, the overall consideration has been to meet, and where possible exceed, the Section 12 requirements. This has been achieved by the careful selection of individual component materials and the use of only recognised and approved paint finishes. Applicable Regulations/Specifications Section 12 of the Fire Precautions Act 1971 The Fire Precautions (Sub-surface Railway Stations) Regulations 2009 BS EN Low voltage switchgear and controlgear. Switches, disconnectors, switch-disconnectors and fuse-combination units. BS HD :2013, BS88-2:2013 Low Voltage Fuses. Equipment Switch disconnector assemblies in the range 40A - 400A are all supplied housed in one of five sizes of sheet steel enclosures. The interior assemblies are all supplied in three pole + switched neutral form. The all metal operating handles are supplied in two sizes across the range, and are lockable in the Off position as standard, with an option to enable locking in the On position. The IP65 sealed enclosures are generously proportioned to allow simple cable connection, with removable gland plates on both top and bottom faces. All external surfaces are finished with a 3M ScotchKote EA9WB approved paint system. Enclosures are finished red or grey and handle assemblies red. The Castell lock option and its operation is shown in detail in appendix A. The lock code must be advised and one key is supplied as standard with each unit. Catalogue Numbers Catalogue Number BS EN Low -voltage switchgear. BS EN Degrees of protection provided by enclosures (IP code) Catalogue Number (With Castell Lock) Rating Finished Grey Finished Red Finished Grey Finished Red Enclosure Size* 40A DCG0403LUL DCR0403LUL DCG0403LUL/CL DCR0403LUL/CL 1 63A DCG0633LUL DCR0633LUL DCG0633LUL/CL DCR0633LUL/CL 1 80A DCG0803LUL DCR0803LUL DCG0803LUL/CL DCR0803LUL/CL 2 100A DCG1003LUL DCR1003LUL DCG1003LUL/CL DCR1003LUL/CL 2 125A DCG1253LUL DCR1253LUL DCG1253LUL/CL DCR1253LUL/CL 2A 160A DCG1603LUL DCR1603LUL DCG1603LUL/CL DCR1603LUL/CL 2A 200A DCG2003LUL DCR2003LUL DCG2003LUL/CL DCR2003LUL/CL 3 250A DCG2503LUL DCR2503LUL DCG2503LUL/CL DCR2503LUL/CL 3 315A DCG3153LUL DCR3153LUL DCG3153LUL/CL DCR3153LUL/CL 4 400A DCG4003LUL DCR4003LUL DCG4003LUL/CL DCR4003LUL/CL 4 London Underground Standards: Fire Safety Performance of Materials. S1913 Common and General Requirements for Fixed Installation Power Supply Equipment. Approval :- Product Registration Certificate No (26th Feb 2015) Status - Authorised for use. (See page 6) Typical Assembly with a Castell lock *See page 2 To call for padlocking in both Off & On positions, add suffix 10 to the catalogue numbers as shown above. - e.g. DCG2003LUL10 Typical Assembly with a grey Copon finished enclosure Interior assembly (100A) Page 1 e: sales@
2 Technical Specification (To BS EN ) Application Sym. Unit Category Rating (A) Rated thermal current I th A Rated Insulation voltage U i V Rated impulse voltage U imp kv Rated operational current (AC) I e A Rated operational power (Frequent operation) Fuse protected short-circuit characteristics Overload capacity Mechanical endurance P e I cw kw ka (rms) 400V - AC22A/AC22B 40/40 63/63 80/80 100/ / / / / / / V - AC23A/AC23B 40/40 50/63 80/80 80/ / / / / / / V - AC22A/AC22B 32/32 32/32 50/50 50/50 125/ / / / / / V - AC23A/AC23B 25/25 25/25 40/40 40/40 63/80 63/80 80/ / / /200 3x400V - AC23A x690V - AC23A Prospective shortcircuit current A Associated fuse rating ka (Peak) ka (rms) Rated peak withstand current Rated short time withstand current ( 1S) Cycles 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 5,000 5,000 - Terminal type Connecting capacity mm 2 Cable section (Min/Max) 4/16 10/16 16/35 25/35 35/50 50/95 70/95 95/ / /240 mm Maximum busbar width Nm Min. Tightening torque Dimensions CASTELL LOCK POSITI Enclosure finished with an approved paint system and sealed to IP65 Page 2 e: sales@
3 Dimensions Continued Locking system allows several individual padlocks to be inserted in both Off & On positions Page 3 e: sales@
4 Step 1a Installation Step 1b Installation Interlock Key Key Trapped Castell Lock Appendix A - Castell Interlock Operation Interlock Disc Mounted on Switch Operating Shaft Door Interlocked Handle Assembly Switch Operating Shaft When the unit is supplied the switch disconnector will be in the position, the Castell lock is in the non interlocked position and the key is trapped in the Castell lock. Step 2 Switching On Key Trapped Key Free To open the door of the enclosure for fitting and cabling. The Castell lock key must be turned 90 degrees anti-clockwise which interlocks the Castell lock to the switch mechanism, thus allowing the Castell lock key to be removed and allowing the enclosure door to be opened. Step 3 Locking On Key Free Following fitting, cabling and closing of the enclosure door, the Castell lock key must be reinserted into the Castell lock and turned 90 degress clockwise, this will disengage the interlock from the disc allowing the switch disconnector to be switched to the position. With the switch in the On position, the Castell lock key must be turned 90 degrees anti-clockwise which interlocks the Castell lock to the switch mechanism, thus allowing the Castell lock key to be removed and kept by the responsible person. Page 4 e: sales@
5 Step 4a Switching Off Step 4b Locking Off Key Trapped Key Free Appendix A - Castell Interlock Operation The responsible person must insert the Castell Lock key and turn 90 degrees clockwise this will disengage the interlock from the switch mechanism allowing the switch disconnector to be switched to the position. Key trapped & interlocking bolt in the withdrawn position To lock the switch the Castell lock key is turned 90 degrees anti-clockwise which interlocks the Castell lock to the switch mechanism, thus allowing the Castell lock key to be removed and kept by the responsible person. Key free & interlocking bolt in the extended position The Castell lock as shown would be mounted on a secure frameword inside the enclosure providing security against tampering. The key barrel protrudes through an aperture in the enclosure lid. Page 5 e: sales@
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