DEWA REGULATIONS FOR ELECTRICAL INSTALLATIONS PDF

Dubai Electricity and Water Authority DEWA has issued its Regulations for Electrical Installations booklet to provide dealers, consultants, electrical engineers and technicians with a guide for the installation and checking of electrical connections, ensuring both their protection and customers. By issuing this booklet, we aim to build bridges of trust with our stakeholders, by ensuring continuous development, according to the latest international standards of safety and security in the workplace. DEWA also supports the Dubai Plan , to transform the Emirate into one of the smartest cities in the world with clean, healthy and sustainable environmental elements. DEWA has launched a number of programmes and initiatives to promote health and safety among stakeholders.

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The Regulations apply to the requirements of all electrical installations in or about buildings and any additions, alterations and extensions to the existing buildings and installations therein, in the Emirate of Dubai.

The Regulations are not intended to take the place of a detailed specification or to instruct untrained persons or to provide for every circumstance. Where a difficult or special situation arises which is not covered or allowed for in the Regulations, the DEWA may be sought to obtain specific advice.

The neutral is solidly earthed at DEWA's substations and shall not normally be earthed elsewhere in the electrical installations. All equipment, apparatus, materials and accessories used in the electrical installations shall be designed and rated for operation on this electric supply. All equipment, apparatus, materials and accessories used in the electrical installations shall be suitable for the purpose intended and capable of operating with satisfactory performance in the climatic conditions of the Emirate of Dubai which are as follows:.

Ambient Air Temperature : 2. Average over 24 Hrs. Careful attention shall be paid to the mechanical execution of the work in connection with any electrical installation.

All electrical installations shall comply with the requirements of the Regulations. Before the commencement of any electrical installations, large or small, new or additional, following details and drawings of the proposed installations shall be submitted to DEWA, for review and approval thereof:.

Single Line Diagram, showing the L. V Distribution and tariff KWh metering Refer to Appendix-5, for symbols and relevant technical specifications. Wiring layouts of the installations. Refer to Appendix-5, for symbols.

The design and layout drawings of substations which are specified for individual installations, shall also be prepared in compliance with DEWA's Regulations for substations, and submitted in advance for approval.

The overall Power Factor of all consumer installations shall be maintained within 0. Guidelines on requirement of PF improvements is also given in Section 8. The guidelines on requirement of UV relays are also given in section 8.

Harmonics of the supply voltage are caused mainly by consumer's non linear loads connected to the supply system. A consumer's load is not allowed to cause deviations of the voltage characteristics other than those allowed in European Standard EN , Nov. Any excess deviations shall be compensated by the consumer at his cost. Contractors shall be required to submit their "inspection Certificate" in the prescribed form, given in Appendix-6, on the completion of the electrical installations.

All installations and equipment installed therein shall be subject to DEWA's inspection, testing and final approval before connecting the electric supply. The first inspection and testing by DEWA may be free of charge. All installations which require re-inspection and re-testing may be charged for each subsequent inspection, based on the type of consumer installation, connected load, etc. Maintenance, periodic inspection and testing of every installation shall be carried out to ensure safety and satisfactory performance.

The frequency of periodic inspection and testing of an installation shall be determined by the type of installation, its use and operation, the frequency of maintenance and the external influences to which it is subjected.

In writing, any defects found in related parts of the exiting installations and their rectification, together with a schedule of test results. Every installation shall also be subject to periodic, random inspection by DEWA. The consumer shall arrange rectification of the defects, if any, notified by DEWA, at his own cost.

The consumer shall not make any extensions or alterations to his electrical installation without obtaining prior approval from DEWA. Accessory: A device, other than current-using equipment, associated with such equipment or with the wiring of an installation.

Ambient Temperature: The temperature of the air or other medium where the equipment is to be used. Appliance: An item of current-using equipment other than a luminaire or an independent motor. Arm's reach: A zone of accessibility to touch, extending from any point on a surface where persons usually stand or move about to the limits which a person can reach with a hand in any direction without assistance. Barrier: A part providing a defined degree of protection against contact with live parts from any usual direction of access.

Bunched: Cables are said to be bunched when two or more are contained within a single conduit, duct, ducting, or trunking or, if not enclosed, are not separated from each other by a specified distance. Cable cleat: a component of a support system, which consists of elements spaced at intervals along the length of the cable or conduit and which mechanically retains the cable or conduit.

Cable Tray: A cable support consisting of a continuous base with raised edges and no covering. Cable Trunking: A manufactured enclosure for the protection of cables, normally of rectangular cross section, of which one side is removable or hinged.

Circuit: An assembly of electrical equipment supplied from the same origin and protected against overcurrent by the same protective device s. Circuit-breaker: a device capable of making, carrying and breaking normal load current and also making and automatically breaking, under pre-determined conditions, abnormal currents such as short- circuit currents. It is usually required to operate infrequently although some types are suitable for frequent operation.

Current carrying capacity of a conductor: the maximum current which can be carried by a conductor under specified conditions without its steady state temperature exceeding a specified value. Current-using equipment: Equipment which converts electrical energy into another form of energy, such as light, heat or motive power. Distribution board: An assembly containing switching or protective devices eg. Fuses, circuit- breakers, residential current operated devices associated with one or more outgoing circuits fed from one or more incoming circuits, together with terminals for the neutral and protective circuit conductors.

It may be included in the board or may be provided separately. Double Insulation: Insulation comprising both basic insulation and supplementary insulation. Duct: A closed passageway formed underground or in a structure and intended to receive one or more cables which may be drawn in.

Earth: the conductive mass of the Earth, whose electric potential at any point is conventionally taken as zero. Earth electrode: A conductor or group of conductors in intimate contact with, and providing an electrical connection to, Earth. Earth leakage current: A current which flows to Earth, or to extraneous-conductive-parts, in a circuit which is electrically sound.

This current may have a capacitive component including that resulting from the deliberate use of capacitors. Earthing: Connecting of the exposed-conductive-parts of an installation to the main earthing terminal of that installation. Earthing conductor: A protective conductor, connecting the main earthing terminal of an installation to an earth electrode or to other means or earthing.

Electric Shock: A dangerous physiological effect resulting from the passing of an electric current through a human body or livestock. Electrical Installation: An assembly of associated electrical equipment supplied from a common origin to fulfill a specific purpose and having certain co-ordinate characteristics. Emergency switching: An operation intended to remove, as quickly as possible, danger, which may have occurred unexpectedly.

Enclosure: A part providing protection of equipment against certain external influences and in any direction protection against direct contact.

Equipment: Any item for such purposes as generation, conversion, transmission, distribution or utilization of electrical energy, such as machines, transformers, apparatus, measuring instruments, protective devices, wiring systems, accessories, appliances and luminaries. Equi-potential bonding: Electrical connection maintaining various exposed-conductive parts and extraneous conductive-parts at substantially the same potential.

Exposed-conductive part: A conductive part of equipment which can be touched and which is not a live part but which may become live under fault conditions. External influence: Any influence external to an electrical installation which affects the design and safe operation of that installation. Fault: A circuit condition in which current flows through an abnormal or unintended path. This may result from an insulation failure or abridging of insulation. Conventionally the impendance between live conductors or between live conductor and exposed-or extraneous-conductive-parts at the fault position is considered negligible.

Fault current: A current resulting from a fault. Final circuit: A circuit connected directly to current-using equipment, or to a socket-outlet or socket- outlets or other outlet points for the connection or such equipment. Fixed equipment: equipment designed to be fastened to a support or otherwise secured in a specific location.

Flexible cable: A cable whose structure and materials make it suitable to be flexed while in service. Insulation: Suitable non-conductive material enclosing, surrounding or supporting a conductor. Isolation: A mechanical switching device which, in the open position, complies with the requirements specified for isolation.

An isolator is otherwise known as dis-connector. Live part: a conductor or conductive part intended to be energized in normal use, including a neutral conductor. Luminaire: Equipment which distributes, filters or transforms the light from one or more lamps and which includes any parts necessary for supporting, fixing and protecting the lamps, but not the lamps themselves, and , where necessary, circuit auxiliaries together with the means for connecting them to the supply.

For the purposes of the Regulations a lamp holder, however supported, is deemed to be a luminaire. LV switchgear and control gear assembly: A combination of one or more low-voltage switching device together with associated control, measuring, signaling, and protective, regulating equipment, etc, completely assembled under the responsibility of the manufacturer with all the internal electrical and mechanical interconnection and structural parts.

The components of the assembly may be electromechanical or electronic. The assembly may be either type-tested or partially type-tested see BS Part 1. Main earthing terminal: the terminal or bar provided for the connection of protective conductors, including equipotential bonding conductors, and conductors for functional earthing, if any, to the means of earthing.

Neutral conductor: the neutral conductor of a 3-phase 4-wire system or the conductor of a single phase installation which is earthed at the source of the supply. Normal voltage: Voltage by which an installation or part of an installation is designed. The following ranges of normal voltage r. Normally exceeding extra-low voltage but not exceeding V a. C between conductors and Earth. The actual voltage of the installation may differ from the nominal value by a quantity within normal tolerances.

Overcurrent: A current exceeding the rated value. For conductors the rated value is the current- carrying capacity. Point in wiring : A termination of the fixed wiring intended for the connection of current using equipment. Extraneous-Conductive- Parts. The main Earthing Terminal. Earth electrode s. The earthed point of the source, or an artificial neutral.

Residual current: The vector sum of the instantaneous values of current flowing through all live conductors of a circuit at a point in the electrical installation. Residual current device: A mechanical switching device or associated of devices intended to cause the opening of the contacts when the residual current attains a given value under specified conditions.

Resistance area for an earth electrode only. Ring circuit: A circuit arranged in the form of a ring and connected to a single point of supply.

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

The Regulations apply to the requirements of all electrical installations in or about buildings and any additions, alterations and extensions to the existing buildings and installations therein, in the Emirate of Dubai. The Regulations are not intended to take the place of a detailed specification or to instruct untrained persons or to provide for every circumstance. Where a difficult or special situation arises which is not covered or allowed for in the Regulations, the DEWA may be sought to obtain specific advice. The neutral is solidly earthed at DEWA's substations and shall not normally be earthed elsewhere in the electrical installations. All equipment, apparatus, materials and accessories used in the electrical installations shall be designed and rated for operation on this electric supply. All equipment, apparatus, materials and accessories used in the electrical installations shall be suitable for the purpose intended and capable of operating with satisfactory performance in the climatic conditions of the Emirate of Dubai which are as follows:. Ambient Air Temperature : 2.

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