Introduction section1: general requirements


IV.INTERNAL LAYOUT/ARRANGEMENT & FAULT RATING



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DEWA Regulations Book - UPDATED 2017
IV.INTERNAL LAYOUT/ARRANGEMENT & FAULT RATING

  1. Segregation of live parts :- Incoming supply terminals/lugs

Bus bar, tap-off connections & terminals (*Separate and independent of each other)


Neutral & Earth Bus-bars & Terminals



  1. Arrangement of bus-bars and tap-off connections to outgoing circuit breakers


  1. Rating/size of phase & neural bus-bars & terminals (at max. 50

oC ambient)

:BS EN 60439
BS 88, BS EN 60439-1, IEC 439-1 & 3


:200A[ ] 300 [ ] 400A[ ] 800A [ ] 1600A [ ] 2500A[ ] BREAKER[ ] ISOLATOR[ ]


:Wall[ ] Floor[ ] Pedestal [ ]
..................................[ ]

:Indoor-IP41/42[ ] Outdoor-IP54/55[ ]


.....................[ ]
:Stove enamelled[ ] Epoxy [ ] Polyester[ ] Galvanized[ ]
................[ ]


:Hinged[ ] Bolted[ ] Panel lock [ ] Gasketted+[ ]

:Glass Window[ ] Gasketted[ ]




:Top[ ] Bottom[ ] Top & Bottom[ ]
: Louvers [ ] ........... [ ]

:Compliance with Regulation 3.3.10[ ]




:Barrier[ ] Shroud[ ] Firmly secured[ ]
*Separately mounted & Removable by tool[ ]


:Barrier [ ] Firmly secured[ ]
*Separately mounted & Removable by tool[ ]


:Separately mounted with adequate working clearances/spacing from incoming supply terminals/lugs[ ]

:Rigid, firmly secured, supported, direct and as short as possible[ ]


Adequately sized[ ] Min. No. bolted joints[ ]
: Rated for max. 70 oC internal ambient, consistent with the rated incoming supply breaker/isolator[ ]
Tinned electrolytic Copper[ ]

4.Rating of Main Incomer and Bus bars DEWA's

- Min. fault rating



  1. Min. & Max. rating of outgoing circuit breakers

-Min. fault rating





  1. Provision of min. working clearance/space for Incoming supply cable terminations

200A/300/400 Incomers Cms 800/1600A/2500 Incomer Cms Outgoing circuit cables



  1. Provision of supports/facility for dressing/clamping outgoing circuit cables




  1. Operational access/convenience for switchgear Incoming supply circuit breaker/isolator Outgoing circuit breaker




  1. Maintenance access/replacement convenience for switchgear components




  1. Provision for termination of Cu./XLPE/AWA(S.C.)


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