PART 1: GENERAL
1.01 GENERAL REQUIREMENTS
A. All general provisions contained herein or within any other Section of the Specification shall
be fully applicable to each and every other Section.
B. Works on all installations shall be carried out in a neat, efficient and workmanlike manner,
assuring satisfactory operation, maintenance and repair. Work shall be in accordance with the requirements of this Specification and shall fulfill its true intent and meaning. No deviations from this Specification and/or the Drawings shall be made without written approval of the Engineer.
C. This Specification and associated Drawings form a composite set of documents, intended for
the selection and installation of equipment having the general and specific characteristics as
D. Unless otherwise specifically stated, the installation shall be left complete, tested and ready
for operation in all respects and fully integrated and coordinated with all other trades.
E. The Contractor shall submit proof, if requested by the Engineer that the materials,
appliances, equipment or devices that are furnished and installed under the contract meet the
requirements of SASO, NEC and NFPA with regard to fire and safety hazards.
1.02 SCOPE OF WORK
A. Work under this division of the Specification shall include furnishing all labor, materials,
equipment and services to install the complete electrical system, putting into operation,
tested and commissioned as shown on the Drawings and as specified herein. The work
includes, but is not limited to, the following principal systems and equipment:
1. Incoming power supply from the electricity feeding source as shown on drawings.
2. Medium voltage power distribution system including MV switchgear, RMU, MV
Cables, power transformers, DC controls, battery charger unit, protective relays and
3. Low voltage power distribution system including LV distribution boards, LV cables,
bus ways, panel boards, etc.
4. Emergency power generation and distribution system including standby generator(s),
ATS, switchgears and all accessories.
5. Un-interruptible power supply system.
6. Electrical installations serving all mechanical plants (HVAC & Plumbing) including
all LV cabling, trays, disconnect switches and connections to equipment.
7. Electrical installations serving all special systems and equipment provided under other
divisions of the Specification such as elevators, arm barriers and other electrically-
8. All kinds of electrical raceways, boxes and fittings.
9. All kinds of wiring devices, dimmers, disconnect switches, starters, electric meters,
10. Interior, exterior, emergency, exit, street, flood, faÃ§ade and other special lighting.
11. Lightning protection system.
12. Earthing system.
13. All low current systems as detailed in the tender documents.
A. The entire Electrical Installation shall comply with the requirements of the latest editions of the
following standards in all respect, including current additions and/or amendments:
1. ANSI American National Standards Institute.
2. ASTM American Society for Testing and Materials.
3. BS British Standards.
4. BS 7671 Requirements for Electrical Installations.
5. CCITT International Telegraph and Telephone Consultative Committee.
6. CENELEC European Committee for Electrical Standardization.
7. IEC International Electrotechnical Commission.
8. IEE Wiring Regulation.
9. IEEE Institute of Electrical and Electronics Engineers.
10. IES Illumination Engineering Society.
11. IPCEA Insulation Power Cable Engineers Association.
12. ISO International Standardization Organization.
13. NEC NFPA 70National Electrical Code.
14. NEMA National Electrical Manufacturers Association
15. NFPA National Fire Protection Association.
16. SASO Saudi Arabian Standards Organization.
17. SEC Saudi Electric Co.
18. STC Saudi Telecom Co.
19. UL Underwritersâ€™ Laboratories.
1.04 ELECTRICAL SUPPLY
A. The Medium voltage electrical power supply from electricity supply authority shall be 3
phase, 13.8 kV Delta, 60 Hertz.
B. The Low voltage electrical power supply and distribution system shall be 3 phase, 4 wire,
and 60 Hertz earthed neutral system. The voltage rating shall be 380/220 Volts for all
buildings and facilities.
1.05 LIGHTING REQUIREMENTS
A. Lighting levels shall be in accordance with appropriate standards and agreed upon with the
Engineer. Low energy lighting shall be the preferred source in all areas. Based on standards set
forth by the Illumination Engineering Society (IES), the following maintained illumination
levels are recommended:
Area Illumination Level (Lux)
Offices 400 - 500
Conference rooms 400 - 600
Computer rooms 500 - 700
Reception/lobbies 100 - 150
Corridors/stairwells 100 - 150
Toilets/hand wash/ablution 100 - 200
Electrical/mechanical rooms 150 - 300
Storage rooms 150 - 250
Streets and open parking areas 10 - 30
Laboratories 300 - 500
Class room 300 - 500
1.06 EARTHING REQUIREMENTS
A. The earthing system shall comply with the following:
1. The National Electrical Code (NEC) - NFPA 70.
2. Any special requirements of the Statutory Electricity Supply Authority (SEC).
3. The International Electrotechnical Commission (IEC).
4. Any special requirements of separate earthing for low current systems in accordance
with relevant standards or manufacturerâ€™s recommendations.
5. Any requirements stated within the Specification.
6. The IEE Wiring Regulations, 16th Edition (1996).
B. The earthing system shall take the form of (TN-C) system for the distribution systems and
TN-S system in all buildings. The Contractor shall ensure that the installation of earthing system complies with the requirements as given in Section 16640.
C. The earthing conductor (the final conductor by which the connection to the selected means
of earthing is made) shall be of copper construction and shall comply with the requirements of NEC article 250 (NFPA-70).
D. All extraneous conductive parts of any equipment or building installation shall be protected
by equipotential bonding in accordance with the requirements of NEC article 250 (NFPA-
1.07 LOW CURRENT AND SPECIAL SYSTEMS REQUIREMENTS
A. Assign a specialist supplier/designer for all low current and special systems.
B. Specialist suppliers shall verify the design and submit shop drawings and materials based on
the requirements of the construction documents and related international standards.
C. Shop drawings and as-built drawings shall be stamped by the suppliers.
D. Suppliers shall support their submittals with catalogues and satisfactory calculations.
E. Bear the cost of any extra items found necessary to provide a properly functional system.
A. The Contractor shall be solely responsible for the proper co-ordination of all phases of the
work and timely delivery to the site of all equipment and materials for proper execution of the work.
B. Co-ordinate the work with all or any other disciplines to ensure proper phasing and
continuity of the Works. If it becomes necessary to remake any part of these works or that of any other discipline or trade as a result of poor or badly timed co-ordination, then all costs associated with remaking those works shall be borne by the Contractor.
C. Co-ordinate with all supply undertakings and authorities and include for attendance along
with all costs involved in re-directing existing services.
D. Take into consideration all statutory and local requirements issued by the Electricity Supply
Authority, Local Authority, Central Government, Broadcasting Authority, Telephone and Telecommunications Authorities along with any other requirements to be considered for the correct and legal operation of the Electrical and Telecommunication Installation or equipment connected to the Installation as part of this Contract. Pay all costs due to the requirements of any authority except for connection fees.
E. The Contractor shall be responsible for co-ordination with all Electrical and Mechanical
systemsâ€™ suppliers and shall include in his cost all the electrical requirements (even if they were not mentioned in the BOQ or drawings) to provide a fully functional system as specified and as recommended by the manufacturer or applicable codes. This shall also be applicable to all ancillary systems and equipment such as Security, Elevators, Audio-Visual, BMS and all low current systems.
1.09 CLIMATE CONDITIONS
A. External to buildings and in non-air conditioned spaces, all apparatus shall be rated for a
ambient temperature maximum of 55 oC, minimum of 0 oC, generally dusty desert
conditions, a maximum humidity of 100% RH, and an elevation of 100 meters above sea
B. In air conditioned buildings, all apparatus shall be rated for ambient temperature of 45 Â°C
maximum, minimum of 0 Â°C and a maximum humidity of 90% RH.
C. When equipment is installed in direct sunlight, it shall either be shielded from direct
radiation or suitably rated for additional solar gains. Cables shall always be shielded from direct sunlight.
D. All apparatus shall be rated for continuous service twenty four hours a day, seven days a
week throughout its normal rated life, except for necessary routine maintenance.
E. All equipment shall be rated for very harsh and corrosive environmental conditions which
persist at the project site. All buried installations shall be suitable for aggressive and salty
A. All works within the project and particularly above suspended ceilings or inside vertical
shafts shall be installed so as to be accessible for operation, maintenance and repair. If
necessary, deviations from the Drawings may be made to accomplish this, but no change
shall be made without written approval from the Engineer. Locations of access doors and
panels shall be approved by the Engineer before installation work is commenced.
1.11 STORAGE OF MATERIALS AND EQUIPMENT
A. Comply with Section 01600.
B. All material and equipment fixed or unfixed shall be protected against corrosion,
deterioration and ingress of foreign matter and moisture.
C. All material and equipment shall be kept clear of the floor or ground by means of wooden
dunnages and shall be protected against weather with durable waterproof wrapping and other
D. The Contractor shall be liable for any loss due to delivery, storage or site security problems.
1.12 PREVENTION OF NOISE AND VIBRATION
A. Provision shall be made to minimize noise and vibration. However, different manufacturer's
equipment will have varying sound and vibration characteristics. The Contractor shall be
responsible for ensuring that equipment installed does not transmit unnecessary noise or
B All equipment installed in plant rooms and outside areas shall not be audible in occupied
C. Any vibration isolators, isolating bases, flexible connections, silencers, other acoustic
treatment or anti-vibration precautions necessary shall be included in the rates for equipment.
D. In individual cases, the suspension shall ensure that the natural frequency of the vibratory
system in the vertical direction is not more than 1/3 of the exciter frequency and shall not exceed 25 Hz.
E. Submit proof of the selected noise proofing measures to the Engineer before commencement
F. Submit to the Engineer for information the noise level generation by the plant selected so
that structural soundproofing measures can be evaluated. This means either data on the acoustic capacity level in relation to frequency, or the sound pressure level measured at 1 meter from the plant at octave median frequencies from 63 Hz to 4000 Hz. Details of the spatial and operational conditions shall also be given.
G. All costs of noise sound level measurements and any repeat measurements, necessary if
acoustic requirements are not met, shall be allowed for by the Contractor.
H. Coordinate and comply with the requirements of noise control as applicable and as given in
A. All moving parts of machinery shall be protected by strong guards to adequately protect all
personnel working on or in the vicinity of equipment. The guards shall be constructed in
such a manner that the movement of drive belts and rotation of shafts may be readily
observed without removal of the guard.
B. All 'live' parts of electrical equipment shall be protected in such a way to adequately protect
all personnel working on or in the vicinity of equipment from injury.
C. Wherever possible, all protective guards shall be supplied by the equipment manufacturer.
All guards shall be strongly attached to equipment and shall be designed to be easily
removed for access, servicing, adjustment and maintenance.
1.14 SIGNS AND NOTICES
A. All signs and notices shall be in Arabic and English with the Arabic version being above or
to the right of the English version.
B. A schedule of all signs and notices with proposed Arabic translations shall be approved by
the Engineer prior to manufacture.
1.15 MOUNTING HEIGHTS
A. Mounting heights of equipment above finished floor level shall be coordinated with
architectural details and other disciplines/equipment. Any discrepancy found between these heights and other details shall be brought to the notice of the Engineer for clarification and final decision. Unless otherwise indicated in Drawings, mounting heights of electrical devices shall be as follows:
1. Panel board: 1800 mm (Top of panel above FFL).
2. Isolating switch: 1250 mm.
3. Light switch: 1250 mm (100 mm from door frame horizontally).
4. Dimmer switch: 1250 mm.
5. Push button station: 1250 mm.
6. Wall mounted telephone/intercom: 1250 mm.
7. Fire alarm manual call point: 1250 mm.
8. Fire alarm sounder: 2100 mm.
9. Fire alarm panel: 1800 mm (top of panel above FFL).
10. Power outlet: 300 mm.
11. Data/Telephone outlet: 300 mm.
12. TV/Radio outlet : 300 mm.
13. Wall mounted speaker: 2100 mm.
B. Where accessories with varying mounting heights (e.g. light switch and socket outlet) are
shown in approximately the same location on plan, their center lines shall be aligned vertically.
C. Where wall mounted accessories are shown adjacent to each other they shall be mounted with
their wall plates separated by a horizontal distance of 14 mm (edge to edge), or as instructed by
1.16 LABELING AND IDENTIFICATION
A. Each item of the Electrical Installation including electrical switchgear, control gear,
equipment, devices, etc. shall be fitted with a non-corrodible label clearly indicating its
function giving at least the following information:
1. Manufacturerâ€™s name.
2. Country of origin.
3. Type/model number or code.
4. Rated voltage, current and frequency (as applicable).
5. Short circuit breaking capacity with time.
6. Compliance mark of the international standard(s).
B. Prior to final testing, confirm that all labeling is intact over the whole site and that all cables
have been fitted with circuit markers. 13800 Volt cables shall be clearly labeled "DANGER
High Voltage" every two meters of their exposed length.
C. All conductors shall have their outer covering colored to suit the phase to which they are
D. An instruction notice giving details of first aid treatment for electric shock shall be
positioned in an approved position in each switch room.
E. Manufacturer's or Contractor's names or trademarks shall not be exhibited anywhere through
the installation without the prior approval and permission of the Engineer with exception that
the Contractor's name and address may be fixed in an approved position on the main
F. All labels shall be in English and Arabic.
1.17 VERMIN PROOFING
A. All items of electrical equipment shall be adequately vermin proofed.
B. Where cables enter or leave the bottoms of switchboards, or pass through pipe ducts, they
shall be sealed by the use of hard wood plugs treated with vermin repellent and surrounded
by mastic sealant.
C. All spare pipe ducts shall be similarly sealed by the use of solid hard wood plugs.
D. Alternative methods of vermin sealing will be accepted, but the written comments of the
Engineer must be obtained prior to installation.
1.18 FIRE AND SAFETY PRECAUTIONS
A. The whole of the works shall be carried out with care and so arranged as to minimize the risk
of fire and the extent of damage resulting from any outbreak of fire.
1.19 POWER SHUT DOWN PROCEDURES
A. During the course of construction a situation may arise when a power outage or shut down of
an existing facility will be required to facilitate power connection of a new installation with the existing facility in operation, or power connection between different phases of a new construction. For such situations or any other situation which requires power shut down of an existing facility under operation, submit a work plan for approval to the Engineer, indicating therein the temporary arrangements he shall make to maintain the continuity of power supply to the existing facility.
B. The activities of the work plan shall be scheduled in such a way to cause minimum
inconvenience to the users or occupants of the existing facility (e.g. shut down during
holiday or after working hours) and in proper coordination with all concerned authorities.
The work plan shall include, but not limited to the following:
1. List of activities prior to power shut down.
2. List of various authorities to be coordinated prior to power shut down.
3. Sequence of various activities for shut down of power supply.
4. Time duration of each activity.
5. Shut down duration for various activities.
6. Alternate power supply arrangement to maintain continuity of power to the existing
7. Reliability of alternate power supply arrangement.
8. Step-wise sequence of activities for restoration of power supply.
C. The cost for the provision of activities and other interim arrangements for the continuity of
power supply to the existing facility during power shut down procedures shall be deemed to
be included in the total price of the tender.
1.20 PENALTY FOR DAMAGE TO EXISTING UTILITIES
A. Study the location of all existing utilities and any other facilities, and perform the Work so as
not to damage them. In the event that any of such facilities are damaged by the Contractor, the same shall be immediately repaired by the Contractor at his cost and responsibility.
B. In the event that the Contractor damages the existing utilities or facilities listed below, the
Contractor shall pay to the Client, in addition to the repair costs, an amount specified below:
1. Power Cable, Control Cable: An amount equal to 100% of Instrument Cable actual
2. Telephone Cable: An amount equal to 100% of the actual repair costs.
3. Fresh Water Line: An amount equal to one 100% of the actual repair costs.
4. Sewer Line: An amount equal to 100% of the actual repair costs.
1.21 SHORT CIRCUIT AND PROTECTION STUDY
A. Obtain the services of the major Electrical Equipment manufacturer to provide a complete
computerized study of fault current and coordination of relays, fuses, circuit breakers, and all other protective devices. The Contractor shall coordinate with the electricity supply authority to include protection settings and fault levels of the electricity supply authority feeders and circuit breakers in the study.
B. The study shall include all feeders at medium voltage and low voltage system.
C. The Contractor shall obtain all data, characteristic curves and all necessary information from all
other trades in connection with his work to provide complete study for the system.
D. The study shall include, but not be limited to the following:
1. Fault current available at each major equipment bus.
2. A tabulation of all protective relay and circuit breaker trip settings and recommended
fuse sizes and types.
3. Transformer damage curves in accordance with manufacturer recommendations.
4. Motor starting profile for largest motor in each control center.
5. A complete set of time-current coordination curves on logarithmic scale sheets.
E. The short circuit and protection study shall be bound in a standard A4 size report. The final
selection and settings of all protective devices shall be based on this study. The complete study
shall be approved by the Engineer. Protective devices shall be adjusted, tested, and calibrated in
the field prior to energizing the equipment per the settings listed in the study.
1.22 SPARES AND CONSUMABLES
A. Provide an unpriced list of spares and consumables to manufacturerâ€™s recommendation for 1
yearâ€™s operation for every item of plant and system at the time of tendering.
PART 3: EXECUTION