Introduction section1: general requirements
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Maximum DemandAll distribution boards shall be rated for total connected loads before a demand factor is applied. The demand load of each final sub-circuit is determined by adding the actual or assumed load of individual points/appliance/equipment, whichever is higher. An allowance for diversity may be permitted where appropriate. The details of load distribution schedules shall be submitted for DEWA's approval in the format given in Appendix 2,3 & 4. The total connected load of individual distribution levels/circuits shall be determined as recommended under section 4 of this Regulation. An appropriate demand factor, worked out by a suitably qualified electrical engineer, shall be permitted; to determine the maximum demand at the main or sub-main distribution level. The limit of 'Maximum Demand' in KW, permitted at Main Distribution Board (MDB) connected to DEWA's supply feeder/transformer for the distribution of normal residential and commercial premises without connecting large motor loads is noted below for guidance. 60 Amp Feeder - 30 KW 100 Amp Feeder - 50 KW 125 Amp Feeder - 60 KW 160 Amp Feeder - 80 KW 200 Amp Feeder - 100 KW 300 Amp Feeder - 150 KW 400 Amp Feeder - 200 KW 1000 KVA Transformer - 800 KW 1500 KVA Transformer - 1200 KW DEWA Transformers supplying Motor / Air-conditioning loads with individual motor / compressor load not exceeding 100 KW shall normally be limited to the following connected load. a) 1500 KVA Transformer - 950 KW c) 1000 KVA Transformer - 650 KW The limits of Total Connected Loads on DEWA Transformers to supply Motors /Chillers with individual load exceeding 100 KW shall be approved taking in to consideration the technical specification of the equipment which includes the rating , type of starters, maximum starting current, no: of compressors / motors & its stages of operation ,etc. for ensuring the safety of both Transformers and equipment. The overload protective device/incomer circuit breaker in the Low Voltage Panels / MDBs shall be suitably set at the corresponding design current. Since maximum demand can vary on each type of project such as residential, commercial, industrial, etc., other method, used by an installation designer with suitable degree of knowledge and experience of the diversity applicable to a particular installation, is permitted. However, the design method and the proposed diversity at each level of the distribution shall be submitted and also clearly indicated in the design drawings and schedules submitted for DEWA's approval Download 2.29 Mb. Share with your friends:
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