DEWA REGULATIONS FOR ELECTRICAL INSTALLATIONS PDF

The minimum space required for installation of KWh meter shall be mm wide and mm high. Metering by means of Current Transformers CTs shall be installed where the circuit breaker rating at the point of supply is Amps and above. Removable links of adequate length shall be provided in the bus bar of each phase to enable easy maintenance and replacement of CTs. Three CLTs shall be provided for each metering. Rated primary current and secondary current.

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The minimum space required for installation of KWh meter shall be mm wide and mm high. Metering by means of Current Transformers CTs shall be installed where the circuit breaker rating at the point of supply is Amps and above. Removable links of adequate length shall be provided in the bus bar of each phase to enable easy maintenance and replacement of CTs. Three CLTs shall be provided for each metering. Rated primary current and secondary current.

Rated frequency and primary maximum voltage Accuracy class. Power flow direction P1, P2 Manufacturer may include any other markings that he considers to be included.

Generally all apparatus, circuit breakers, isolators, bus bars, removable lid section of bus bar-trunking, etc. Every item of equipment used in the installation shall be designed and rated to, operation on the nominal electric supply voltage declared by DEWA. Cables for connection between ceiling rose and lamp holder for pendant type fittings and for enclosed luminaire shall be heat resistant silicone rubber insulated stranded copper conductor complying with BS For lifts and similar applications rubber insulated or PVC insulated flexible cable complying with BS shall be used.

Single core cables armoured with steel wire or tape shall not be used for a. Flexible steel conduits and fittings shall comply with BS Part 1. The trays shall be provided with upstands on both sides. Cables shall be fastened securely by purpose made clips, cleats or saddles. The assemblies shall be constructed only of materials capable of withstanding the mechanical, electrical and thermal stress as well as the effects of humidity which are likely to be encountered in normal service.

Apparatus forming part of the assembly shall have clearances, creepage distances and isolating distances complying with BS EN , maintained during the normal and relevant service conditions. The phase busbar, neutral bar and earth bar colour identified as given in Appendix The neutral bar shall be of the same cross section as the phase bus bar. The Circuit Breakers, Bus Bars, etc.

The switchgear, equipment and accessories shall generally comply with the standards specified in Appendix — 1. An integral isolator shall be provided for isolation of the incoming supply. The circuit breaker accessories, etc.

Re-wirable type fuses shall not be permitted in any type of wiring installation. The minimum current rating shall be 5 A.

For industrial use the switches shall be metal clad. Weather proof switches shall be used for all outdoor installations.

Switches installed for control of discharged lighting shall have a current rating not less than twice the steady state continuous current of the circuit.

The industrial plugs and socket —outlets shall comply with BS and shall be with switch, integrally built in or attached to it. The rating and type of socket-outlets with plugs provided shall be selected to suit individual applications and shall not be interchangeable for different current ratings. The cooking appliance shall incorporate an integral earthing terminal. The cooker control switch shall be 2 pole for 3 phase appliance and connected to a separate final sub-circuit from the distribution board.

The final connection to the heater shall be made from a flex outlet plate mounted adjacent to the heater. Water heater shall be connected to a separate final sub-circuit from the distribution board. The heater shall incorporate an integral earthing terminal adjacent to the phase and neutral terminals. All terminals shall be housed in suitable recess with a splash proof removable cover. Double pole switch, of appropriate rating, with flex outlet mounted adjacent to the unit shall be provided for control of other room air-conditioning unit.

Each room air-conditioning unit shall be connected to a separate final sub-circuit, for the distribution board. A maximum of two air-conditioning units are permitted to connect on a single phase supply. Where three or more units are installed they shall be balanced as nearly possible lover a three phase supply.

The safety isolation transformer shall comply with BS Segregation of low voltage and extra low voltage circuits shall be in accordance with Regulation 7. The source of supply for safety lighting shall be either maintained or non-maintained type as appropriate to suit individual applications. All electrical switch-rooms and operational areas shall be provided with adequate number of emergency light fittings. The safety and emergency light fittings installed shall comply with BS and shall be rated for a period not less than 3 hours continuous operation.

The light fittings shall normally incorporated necessary battery and charger within. All electric motors shall be adequately protected against overload, short circuit, earth leakage and additionally, against loss of one or more phases, voltage fluctuations, etc. Starters shall be provided with overload relays of the thermal type with automatic compensations for variation in ambient temperature between 2.

All three phase motors over 3 HP and single phase motors above 1HP shall be provided with current limiting starting equipment to effectively keep the starting current within the following limits.

The starting equipment to limit the current may consist of any of the following type or other approved by DEWA a Star — Delta b Primary — Resistance c Auto — Transformer All motors shall be provided with an isolator, for isolating the motor from the supply during periods of inspection or maintenance. Such means of isolation shall effectively interrupt the supply on all phases.

The isolator may be integral with the control gear or separate, but shall be in close proximity to the motor. An emergency stop push button shall be incorporated in the control gear. When motor starting gear is energized from an auxiliary circuit, the circuit shall also isolated during maintenance. All starters, isolators and push buttons shall be clearly marked in Arabic and English stating which machine they control and their function.

Motors and their control gear shall be located in well ventilated situations with adequately space for operation, inspection and maintenance. The change-over circuit breaker or isolator shall have 4 — poles for 3 phase supply and 2 — Poles for 1 — Phase supply to ensure that the phases and neutral of the systems remain separate and distinct.

The installation shall ensure that there will be no possibility to parallel generator supply with DEWA supply under any circumstances or conditions.

Adequate mechanical and electrical interlock between the incomer circuit breakers or isolators of both generator and DEWA supplies shall be provided. The full details of the equipment, circuit and wiring diagrams, details of essential loads, etc. A minimum of W shall be considered for each normal lighting and fan points.

Fluorescent lamp assessed as 1. Wherever fittings with discharge light, compact fluorescent lamps or low volt lamps installed, the circuit breaker rating, circuit conductor sizes and number of fittings may be suitably selected based on the actual load, including losses, for specific application.

Prior approval from DEWA shall be obtained for every installation. A radial final sub-circuit may be installed to serve a maximum of five 13 A, switched socket-outlets in room other than kitchen and controlled by a 20 A circuit breaker in the distribution board. A maximum of ten socket-outlets in room other than kitchen may be connected to a ring circuit, controlled by a 30 A circuit breaker. A current demand or 13 A shall be assumed for each 13 A switched socket outlet circuit.

A minimum of Watts per point may be considered for each 13 A switched socket-outlet, installed for general utility purpose, other than kitchen, all twin socketoutlets shall be considered as two separate socket-outlet points. A kitchen area may need separate circuits. A current demand of 15 A shall be assumed for each 15 A switched socket-outlet circuit.

However, for general purpose utility socket-outlets an assumed load of W per socket-outlet installed in commercial and industrial premises and W per socket-outlet in residential premises may be permitted. For stationary appliance and equipment including air-conditioners, the actual load of each appliance and equipment shall be considered load. Current demand of point such as electric clock and other current using equipment of rating not greater than 5 VA may be neglected.

For multi consumer installation which includes commercial type of premises such as Shops, Showrooms, Garages, Workshops, etc. An allowance for diversity may be permitted where appropriate. Since maximum demand can vary on each type of project such as residential, commercial, industrial, etc. The connection to the earth electrode, within the inspection pit shall be soundly made by a corrosion resistant terminal clamp.

AASHTO T321 PDF

Dubai Electricity & Water Authority (DEWA) |DEWA Circulars & Regulations

Zolobei For industrial use the switches shall be metal clad. The temperature of the air or other medium where the equipment is to be used. Minimum 4 years of Electrical Installation and construction related work. Draw-wires shall be provided in all concealed conduits and ducts with the ends left free at the outlet boxes for pulling the wiring cables. Starwood Electromechanical Works Congratulations on your startup!

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