SECTION 680 -- PORTABLE CONSTRUCTION LIGHTING
680.01 Description. Whenever the Contractor's operations are being conducted at night,
the Contractor shall provide artificial lighting as may be necessary to provide for safe and proper construction and inspection of the work . This work shall consist of furnishing, installing, maintaining, moving and removing lighting for nighttime work operations.
680.02 Materials. All lighting equipment will be furnished as required and retained by
the Contractor after the work is completed. Material and/or equipment are not required to be new but shall be in good operating condition and in compliance with applicable safety and design codes. Prior to beginning nighttime operations, the Contractor shall submit a lighting plan showing the type and location of lights proposed for use during night work. It shall clearly show the location of all lights necessary for ever y aspect of work to be done at night. In addition to the lighting plan, the Contractor shall submit catalog cuts giving the specific brand names, model numbers and ratings of the lighting equipment. The lighting plan shall include power ratings, photometric data, and lighting calculations confirming that the illumination requirements will be met by the layout. Night work shall not begin until the Contractor has submitted the above mentioned lighting plan meeting the requirements set forth in this specification. The Contractor shall take lighting level measur ements in the presence of the Engineer at locations designated by the Engineer to verify compliance with the lighting plan and the specifications. Field light level measurements shall be equal to or exceed required light levels.
680.02.1 Tower Lights. Tower lights shall consist of lighting fixtures mounted on a
tower up to thirty (30) feet in height. The tower light fixtures shall be heavy duty flood, area, or roadway style with wide beam spread. The tower shall be sturdy and free-standing without the aid of guy wires or bracing. Th e power supply shall be of sufficient capacity to operate the light(s) and shall be located for the shortest safe routing of cables to the fixtures. Tower lights shall be of sufficient wattage and/ or quantity to provide an average maintained horizontal luminance in accordance with Subsection 680.02.3.
680.02.2 Machine Lights. All moving equipment used during night time operations shall
have a balloon lighting system or equivalent system and a flashing amber light on the equipment. In lieu of a flashing amber light, the Contractor may install four square feet of approved reflective material on the equipment in a location that will be seen by the traveling public. This lighting system shall illuminate the work area in each direction of travel of the equipment. Work area shall be de fined as 30 feet in front and 30 feet behind moving equipment. Machine lights shall be heavy duty flood, area, or roadway style with wide beam spread mounted on su pports attached to the construction machine at a height of no more than thirteen (13) feet. The power supp ly shall be of sufficien t capacity to operate the light(s) and shall be securely mounted on the machine. Electrical grounding of generators to frames of machines on which they are mounted shall be done in conformance with the National Electrical Code (NEC). The light fixtures shall be of sufficient wattage and/or quantity to provide an average maintained horizontal luminance in accordance with Subsection 680.02.3. Machine lights are in addition to conventional automotive type head lights, which are necessary for maneuverability.
680.02.3 Lighting Levels . The submitted lighting plan shall indicate how the Contractor
intends to accomplish the lighting of the work ar ea(s). Work areas shall be classified into one (1) of the following categories depending on the type of work to be accomplished: CATEGORY I - Category I work areas will be lit to five foot-candles (5 fc). This category of work includes general work zone safety and visual tasks with large objects. CATEGORY II - Category II work areas will be lit to ten foot-candles (10 fc). This category of work includes work around all co nstruction equipment and visual tasks that require greater accuracy such as inspection of pavi ng and resurfacing activities. CATEGORY III - Category III work areas will be lit to twenty foot-candles (20 fc). This category of work includes activities that requir e the highest visual efficiency. These tasks present higher levels of visual difficulty and require significant attention from the observer, such as crack and pothole filling, joint sealing, critical connection and maintenance involving electrical connections and moving mechanical parts. Lighting equipment shall be placed so the uniformity ratio, average maintained to minimum, shall not be greater than 10:1.
680.03 Construction Requirements.
680.03.1 Lighting Systems . Tower lights may be used when the night work is confined
to a fairly small area and is essentially a stationary operation. A balloon lighting system or equivalent system shall be used when the night work is not confined to a small area and is essentially a continuous moving construction operation. Use of tower lights in lieu of balloon lights will be considered when the number of machines, type of work, or need for inspection justify their use as decided by the Engineer. The work area where traffic control devices are being set up or repositioned at night shall be illuminated. If night work requires the use of a flagger, then the flagger must be illuminated by balloon lighting or equivalent system providing ten foot-candles (10 fc). The illuminated work area shall be large enough so that the movements of all personnel and equipment engaged in the work will be contained in the area. The Contractor shall provide sufficient fuel , spare lamps, generators, and personnel qualified to operate the lights to assure that they will be maintained in operation during night work. Existing roadway lights shall not eliminate the requirement for the Contractor to provide lighting. Consideration may be given to th e amount of illumination provided by existing lights in determining the wattage and/or quantity of lights to be provided, if noted in the Contractor's submitted lighting plan.
630.03.2 Glare Control. All lighting shall be designed, installed, and operated to avoid
glare interference with roadway traffic or discom fort for residences adjoining the roadway. The Contractor shall locate, aim, and adjust the lights to provide the required level of illuminance and uniformity in the work area w ithout the creation of objectionable glare. The Engineer shall determine when glare ex ceeds acceptable levels, either for traffic or adjoining residences. The Contractor shall provide shields, visors, or louvers on luminaries as necessary to reduce objectionable levels of glare. Lighting systems should not be aimed higher than 30° from straight down unless the fixture has been specifically designed to prevent glare. In no case shall the main beam of the light be aimed higher than 60° above straight down. The lights should be set as far from traffic as practical and aimed in the direction of, or perpendicular to, the traffic flow.
680.04 Method of Measurement. Portable construction lighting, by tower and/or
machine lighting systems, will be measured for payment only when a pay item for portable construction lighting is included in the contr act. Otherwise, portable construction lighting will be considered incidental to other contract items and no direct payment will be made. When a pay item for the portable construction lighting is provided in the contract, measurement will be made at the contract lump sum price. Partial payments for this pay item will be made as follows:
1.50% of the lump sum price on the first monthly estimate after using the lighting system.
2.25% of the lump sum price on the first monthly estimate made after 50% of scheduled night work that requires construction lighting is completed.
3.25% of the lump sum price on the first monthly estimate after the completion of all scheduled night work that requires construction lighting.
680.05 Basis of Payment. Portable Construction Lighting, as measured above, shall be
paid for at the contract lump sum price, which price shall be full compensation for furnishing, operating and maintaining everything necessary to provide a portable construction lighting system. Payment will be made under: 680-A: Portable Construction Lighting - lump sum SECTION 681 - ROADWAY LIGHTING SYSTEM
681.01 Description. This work consists of furnishing; installing, testing, erecting,
constructing and assembling all materials to ensure a properly operating roadway lighting system in accordance with the plans and specifications.
681.02 General Provisions.
681.02.1 Tests and Inspection. The complete job shall be, during and/or after
Source: Mississippi Standard Specifications for Road and Bridge Construction, 2017 Edition. Pages 701–702 of 1,113.