issued and posted on DEWA website from time to time. The objective of the regulation is to provide consumers, consultants, contractors, electrical engineers . To view the PDF documents supporting accessibility options, please DEWA Regulations for Electrical Installations: Use of CT Operated Meter for Amps Connection Domestic Water Meter Installation in Villas and Sheds- Guidelines. To provide guidelines to all the major developers and the consultants in regard to the DEWA's The technical requirements that are necessary to be submitted to DEWA for planning any riastanufulthep.gq
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Download as PDF, TXT or read online from Scribd. Flag for . Guidelines on requirement of PF improvements is also given in Section of the. Regulatons. Regulations Handbook-DEWA - Download as PDF File .pdf), Text File .txt) or read online. requirements, DEWA Protective Rules & Regulations to work in the. DEWA-Water(New Regulation).pdf - Download as PDF File .pdf), Text File .txt) or read online. DEWA Water Regs.
Each of the existing cable should be encased by new mm dia split duct and all ducts plus two spare ducts should be encased by concrete to be called as Concrete Duct Bank. There concrete duct bank should extend at least one meter away, from edges of the proposed road. No part of parking area should be constructed over underground cable joint and ush type Link box.
Flush type cable route marker should be installed over the cable route at maximum interval of 50 meters for straight cable run.
Figure: 1. New spare ducts end to end to be provided, if not possible and maintain minimum 1. Height limit gantries: Installation of temporary height limit gantries about 5. Crash barrier: Temporary concrete crash barriers need to be installed around nearby tower foundation Fig 4. Horizontal clearance: Minimum horizontal clearance of about 40m and 30m from tower concrete foundation to edge of road and bridge to be ensured for kV and kV OHL respectively.
Vertical Clearance: Minimum vertical clearance of about Permanent Height limit gantry: Permanent heights limit Gantry of about 5. Scafolding protection: Scafolding to be provided for road crossing, during Tower Construction activities Figure: 4.
If any particular locations are required to cross over the Extg. Any item for such purposes as generation. Earthing conductor: A protective conductor.
Earth Earth electrode resistance: Earth electrode: A conductor or group of conductors in intimate contact with. Emergency switching: An operation intended to remove. Conventionally the impendance between live conductors or between live conductor and exposed-or extraneous-conductive-parts at the fault position is considered negligible.
A circuit condition in which current flows through an abnormal or unintended path. This may result from an insulation failure or abridging of insulation.
Electrical Installation: An assembly of associated electrical equipment supplied from a common origin to fulfill a specific purpose and having certain co-ordinate characteristics.
A part providing protection of equipment against certain external influences and in any direction protection against direct contact.
External influence: Any influence external to an electrical installation which affects the design and safe operation of that installation.
Connecting of the exposed-conductive-parts of an installation to the main earthing terminal of that installation. This current may have a capacitive component including that resulting from the deliberate use of capacitors. Equi-potential bonding: Electrical connection maintaining various exposed-conductive parts and extraneous conductive-parts at substantially the same potential.
Electric Shock: A dangerous physiological effect resulting from the passing of an electric current through a human body or livestock. Earth Fault current: A fault current which flows to Earth.
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. Earth leakage current: A current which flows to Earth. 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. The components of the assembly may be electromechanical or electronic.
An isolator is otherwise known as dis-connector. Main earthing terminal: C between conductors and Earth. Flexible cable: A cable whose structure and materials make it suitable to be flexed while in service.
The assembly may be either type-tested or partially type-tested see BS Part 1. LV switchgear and control gear assembly: A combination of one or more low-voltage switching device together with associated control.
Neutral conductor: Fixed equipment: Suitable non-conductive material enclosing. Normal voltage: Voltage by which an installation or part of an installation is designed. Normally not exceeding 50V a. The actual voltage of the installation may differ from the nominal value by a quantity within normal tolerances. Normally exceeding extra-low voltage but not exceeding V a. The following ranges of normal voltage r.
For the purposes of the Regulations a lamp holder. Equipment which distributes. Fault current: A current resulting from a fault. Live part: Flexible cord: Final circuit: A circuit connected directly to current-using equipment. A mechanical switching device which. Point in wiring: A termination of the fixed wiring intended for the connection of current using equipment. It may also be capable of making. Short-circuit current: An overcurrent resulting from a fault of negligible impedence between live conductors having a difference in potential under normal operating conditions.
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. Ring circuit: A circuit arranged in the form of a ring and connected to a single point of supply. An assembly of switch gear with or without instruments.
Switch gear: An assembly of main and auxiliary switching apparatus for operation. Earth electrode s. Resistance area for an earth electrode only. Space factor: The ratio expressed as a percentage of the sum of the effective overall cross-sectional area of cables forming a bunch to the internal cross-sectional area of the conduit.
A current exceeding the rated value. XLPE as insulation of cable: Cross linked polyethylene complying with BS A mechanical device capable of making. A conductor used for some measures of protection against electric shock and intended for connecting together any of the following parts. A luminaire track system is not regarded as a socket-outlet system. The main Earthing Terminal. 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.
PVC as insulation or sheath of cable: Polyvinyl Chloride Compound complying with BS Overload current: An overcurrent occurring in a circuit which is electrically sound. The earthed point of the source. For conductors the rated value is the current- carrying capacity. Adequate level of illumination shall be provided to facilitate safe operation at all time. In some circumstances a substation may be required for connected load less than KW.
A minimum space of mm shall be provided in the front and mm on the sides. Panels with rear access doors shall have. Point of supply shall be made available only at one location. Where more than one incoming supply is available. These requirements shall be confirmed in the issue of DEWA's No Objection Certificate which shall be revalidated at the end of every six month period. P2 Manufacturer may include any other markings that he considers to be included.
Three CLTs shall be provided for each metering. In some circumstances consumer may be permitted to provide the KWh meter and CTs. Removable links of adequate length shall be provided in the bus bar of each phase to enable easy maintenance and replacement of CTs. Generally all apparatus. 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 Single core cables armoured with steel wire or tape shall not be used for a.
For lifts and similar applications rubber insulated or PVC insulated flexible cable complying with BS shall be used. Typical selection of the cable. Yellow and Blue phases as evenly as possible. BS 31 and shall be hot dip galvanized to class 4 protection.
Steel conduits and fittings shall comply with relevant specifications in BS BS BS Part. Flexible steel conduits and fittings shall comply with BS Part 1. The phase busbar. The trays shall be provided with upstands on both sides. An integral isolator shall be provided for isolation of the incoming supply. Bus Bars. The assemblies shall be constructed only of materials capable of withstanding the mechanical.
Apparatus forming part of the assembly shall have clearances. Cables shall be fastened securely by purpose made clips. The neutral bar shall be of the same cross section as the phase bus bar. Ammeter with CTs applicable.
The Circuit Breakers. The switchgear. Switches installed for control of discharged lighting shall have a current rating not less than twice the steady state continuous current of the circuit. Re-wirable type fuses shall not be permitted in any type of wiring installation.
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 cooking appliance shall incorporate an integral earthing terminal. The minimum current rating shall be 5 A. Use of cooker control unit incorporating a general purpose socket — outlet shall be avoided. For industrial use the switches shall be metal clad. The industrial plugs and socket —outlets shall comply with BS and shall be with switch. 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.
Weather proof switches shall be used for all outdoor installations. The circuit breaker accessories. All terminals shall be housed in suitable recess with a splash proof removable cover. The safety isolation transformer shall comply with BS The final connection to the heater shall be made from a flex outlet plate mounted adjacent to the heater.
Where three or more units are installed they shall be balanced as nearly possible lover a three phase supply. RMS to earth. Water heater shall be connected to a separate final sub-circuit from the distribution board. Segregation of low voltage and extra low voltage circuits shall be in accordance with Regulation 7. The heater shall incorporate an integral earthing terminal adjacent to the phase and neutral terminals. A maximum of two air-conditioning units are permitted to connect on a single phase supply.
The source of supply for safety lighting shall be either maintained or non-maintained type as appropriate to suit individual applications. Each room air-conditioning unit shall be connected to a separate final sub-circuit.
Double pole switches with neon indicator of appropriate rating shall be provided for control of water heaters. Double pole switch. When motor starting gear is energized from an auxiliary circuit. Starters shall be provided with overload relays of the thermal type with automatic compensations for variation in ambient temperature between 2.
Type of Supply Rating of Motor Max. An emergency stop push button shall be incorporated in the control gear.
All electric motors shall be adequately protected against overload. All electrical switch-rooms and operational areas shall be provided with adequate number of emergency light fittings. 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.
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 isolator may be integral with the control gear or separate.
The safety light fittings shall also incorporate appropriate sign in Arabic and English such as 'EXIT' and directional arrows. Where large number of motors above HP are proposed. 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. Such means of isolation shall effectively interrupt the supply on all phases. The light fittings shall normally incorporated necessary battery and charger within.
The full details of the equipment. All starters. The installation shall ensure that there will be no possibility to parallel generator supply with DEWA supply under any circumstances or conditions.
A kitchen area may need separate circuits. 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. A current demand or 13 A shall be assumed for each 13 A switched socket outlet circuit.
Prior approval from DEWA shall be obtained for every installation. A minimum of W shall be considered for each normal lighting and fan points.
A current demand of 15 A shall be assumed for each 15 A switched socket-outlet circuit. A maximum of ten socket-outlets in room other than kitchen may be connected to a ring circuit. A minimum of Watts per point may be considered for each 13 A switched socket-outlet. A radial final sub-circuit may be installed to serve a maximum of five 13 A. Adequate mechanical and electrical interlock between the incomer circuit breakers or isolators of both generator and DEWA supplies shall be provided.
Fluorescent lamp assessed as 1.