Interior and Exterior Lighting Installation Method Statement

By | April 14, 2024

Below method statement covers installation and connection of all interior and exterior lighting, lighting control devices and wiring devices according to the approved shop drawings, project specifications and other related codes.

One of the purpose of this method statement is to coordinate the exact location and position of all lighting fixtures, switches, outlet boxes and connection to lighting control system as per architectural, mechanical, structural and RCP drawings.

Necessary Tools & Equipment

Below is list of necessary tools for the installation of exterior and interior lights.

  • Mini Hacksaw Frame with Blades
  • Choke Lime Powder with sufficient length of Thread
  • Measuring Tape
  • End Cutter
  • Ladder / Scaffolding
  • Manual Auger Bit
  • Hammer
  • Drill Machine
  • Portable hand tools
  • Grinding Machine
  • Spirit level & water level
  • Centre punch
  • Wooden hammer
  • Electrical drill (only for surface installation works)
  • Diagonal- cutter pliers
  • Shank screwdriver

General Requirements for Lighting Installation

All interior and exterior lighting fixtures shall be UL listed and comply with the requirements of ANSI, NEC and SASO.

Ensure that all relevant documents have been approved prior to commencing installation, and that the latest revisions of shop drawings, specifications including approved procedures are distributed to concerned personnel who will carry out the work for the lighting installation.

Make sure that all personnel are qualified to perform the electrical installation work and are fully familiar with all the tools and equipment’s to be utilized.

Check materials that these are not damaged before issuing from warehouse and transporting to the work area.

All materials of unapproved/damage condition or low quality shall be immediately segregated from the job site to a quarantine area.

Reflected ceiling plans are to be checked to ensure exact positions of fixtures with respect to structural members, ducts, pipes, other installations and ceiling panels/tiles, where required.

Conduit / wire way installation shall be complete between lighting fixtures, control switches, junction boxes, electrical cabinet and splicing points prior to the installation of conductors.

Verify that bushings are installed in each junction box, pull box and electrical cabinet prior to cable pulling.

Check the conductors installed are as per approved drawings and correct cable type, size and color coding has maintained.

Daily housekeeping shall be conducted after work, especially to remove left-over materials from the work area.

Coordination shall be done with other disciplines prior to starting any lighting installation work.

Interior Lighting Installation Method

Ensure fixtures level are installed, aligned and parallel or square to building lines at uniform heights as shown on the approved shop drawings and final height adjustments are made prior to the

Make sure that nameplate details, numbers of circuits and panel board location, elevation are in accordance to shop drawing & Project requirements.

Provide fixtures/ fixture outlet boxes with hangers, brackets and flanged bolted fittings, to support weight of fixture.

Fixtures to be mounted on outlet boxes to fixture studs.

Provide one point of support in addition to the outlet box fixture stud for individually mounted fixtures longer than 600 mm.Interior and Exterior Lighting Installation Method Statement

Provide two stem hangers for individually mounted pendant fixtures.

Stems are to have suspension aligners and are to be of suitable length for suspending fixtures at required height.

For Suspended ceilings: provide suspend fixtures directly from building structure.

For Solid ceilings: Coordinate dimensions of recesses in ceilings with exact fixture dimensions and structural elements.

Ensure that fixtures are arranged in continuous rows with minimum spacing between fixtures so that individual fixture can be removed without dismantling remaining fixtures.

Cover plates are to be installed over fixture outlet box or opening in ceiling or metal frames of the lamps are to be earthed properly.

Install flush recessed fixtures to completely eliminate light leakage within fixture and between fixture and adjacent finished surface.

After fixtures are installed ensure that ventilation channels are kept free prior to the requirement of fixture design.

Ensure that enclosed fixtures are installed with reasonably insect/dust tight, and complete weather-proof are installed for weather conditions.

Place new lamps in fixtures immediately prior to handover. Lamps used for temporary services are not to be used for final lamping of fixtures.

Lamps in each fixture are installed with set level, plumb, square with ceiling and walls in accordance to manufacturer’s instruction and approved material submittals.

For grid type suspended ceilings, install a minimum of four ceiling support system rods or wires for each fixture.

Support clips, fasten to fixtures and ceiling grid members at or near each fixture corner.

Clean fixtures internally and externally after installation.

Exterior Lighting Installation

Make sure that the flood light poles, lighting standards and columns are assembled as per the manufacturer’s instructions and inspected to ensure all accessories are fitted and securely fixed.

Ensure that the conductors, warning tapes installations are done as per approved shop drawings and project specifications.

Make sure that conductors are installed of correct size and proper color coding has been maintained.

Ensure that Holding down and plumb adjusting nuts, washers, locknuts or nuts are of stainless steel or cadmium plated.

Make sure that lightings installed are easily accessible for operation, maintenance and repair etc.

Luminaires and supports are to be attached to allow aiming for indicated light distribution.

Floodlights are to be mounted on specially designed brackets to allow swiveling in any desired direction and locking firmly in final position.

Fasten luminaires to suitable structural supports.

Tighten electrical connectors and terminals according to manufacturer’s torque tightening values.

Clean fixtures internally and externally after installation.

Testing of Lighting Fixtures

Perform illumination level test to determine level and uniformity at selected locations.

Perform operational test for each fixture after installation.

Insulation resistance and continuity tests are to be carried out on each circuit with circuit breakers in open position and lamps not installed.

Perform operational test for all circuit breakers and control gears with lamps installed.

Voltage at terminals of ballasts are to be recorded on final columns of each circuit and at distribution panel.

Perform electrical supply interruption demonstration i.e. proper operation of emergency lighting system.

Perform Insulation resistance and continuity test for each circuit and circuit breaker for equipment before Energization.

Perform operational test for all circuit breakers and control gears with lamps installed.

Perform Earthing resistance tests which includes measurement of earth electrode resistance at final points of circuits and continuity of protective conductors.

Test normal operation of lighting units after installing luminaires.

Measure light intensities at night. Use calibrated photometers. Ensure Intensity and uniformity of illumination are checked.

Malfunctioning fixtures and components should be repaired or replaced.

Test results are to be recorded using approved format on site.

Installation of Lighting Control Devices

Outlet boxes, switches, socket outlets, plugs, switch disconnect, lighting contactors and dimmers shall be as per project specifications.

All lighting control devices and components shall comply with the applicable standards of SASO, NEMA, NEC, B8 and ANSI.

Lighting control devices are mounted according to manufacturer’s instructions.

For suspended devices: Mounting heights are to be bottom of the unit and to centre.

For wall-mounting devices: Mounting heights are to be centre of unit.

Install wiring between sensing and control devices according to manufacturer’s instructions.

Ensure that master selector switch panel comprise set of switch buttons of normally Open type assembled in one-unit comprising box and cover with individual switch per circuit.

Bundle, trail and support wiring in enclosures.

Ensure Proper Grounding is done for the equipment.

Tighten electrical connectors and terminals with torque wrench to manufacturers torque tightening values.

Proper identification shall be done to identify components and control wirings.

Clean equipment and devices internally and externally and repair damaged finishes.

Exact locations of outlets and switching devices are to be determined from interior finishing and detailed approved drawings.

Any condition that would place an outlet in an unsuitable location is to be referred to the engineer.

Locate switches at strike sides of doors.

Mounting heights for outlet boxes and switches are to be uniform within similar areas.

Mount lighting switches at 1350 mm (100mm from door frame, horizontally) and socket outlets at 300 mm from finished floor level respectively.

Mount switches with long dimension vertical and operating handle, if of toggle type up when in on position.

Make neat openings for recessed outlet boxes allowing for thickness of finishing and use extension rings if required.

Install exposed boxes and plates plumb, square and parallel to finished wall surface.

Exposed plates covering recessed boxes are to rest neatly on wall surface without gaps and fully covering the box.

Grouped outlets are to be arranged neatly so that use of fittings is convenient and clear.

Water and explosion proof fittings shall be installed securely to achieve required degree of protection.

Where appliance is designed to adapt directly to outlet box, extend wiring to incoming terminals inside appliance.

Where appliance is not designed to adapt to outlet box, install connecting wiring in flexible conduit firmly fixed to outlet box cover plate and to terminal box on appliance.

Where three or more switches are ganged, identify each switch with approved legend engraved on wall plate.

Receptacles should be identified by panel board and circuit number from which served.

Use machine printed, pressure sensitive, abrasion resistant label tape on face of plate and durable wire markers or tags within outlet boxes.

Lighting Connection Requirements

Single pole switches are to switch the phase wire, do not run neutral wire through switches having neutral shunt or bridge.

Exposed outlet boxes should be securely fastened to wall with machine screws.

Tighten electrical connectors and terminals as per manufacturers torque tightening values using torque wrench.

Internally clean devices, outlet boxes and enclosures.

Replace stained or improperly painted wall plates or devices.

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