ITEM 631 SIGN LIGHTING AND ELECTRICAL SIGNS
631.01
Description
631.02 General
631.03
Materials and Equipment
631.04 Sign
Service
631.05 Signs
Wired
631.06
Disconnect Switch
631.07
Luminaire
631.08 Controls
631.09
Electrical Signs
631.10 Removal
631.11
Inspection and Testing
631.12 Method
of Measurement
631.13 Basis of
Payment
631.01 Description. This work consists of
furnishing and installing sign lighting or electrical sign equipment, complete,
tested, and ready for service.
631.02 General. Perform installations according
to the National Electrical
Safety Code, the National
Electrical Code and local codes for the area of installation. Furnish
overhead sign lighting and integrate electric power with roadway lighting
circuits.
Furnish
certified drawings according to 625.06.
Conform to the requirements
of Supplement 1063
for the installation or testing of electrical items installed under 631.08 and 631.09.
Protect wire and
cable by installing entirely within support structure interiors, enclosures,
junction boxes, and rigid or flexible conduit. Ensure that the methods,
materials, and locations of splicing and the methods of connecting and
identifying wire and cable conform to Item 625, Item 725, and the plans. Furnish grounding systems
according to 625.16.
Power
service is furnished under Item 625.
631.03 Materials and Equipment. Furnish
materials and equipment that are new, of first quality, of current design, and
free from defects.
Use
electrical parts, wire, switches, and other elements of the installations that
are of ample capacity to carry the required current without excessive heating
or drop of potential.
Ensure
that each item of equipment bears a nameplate, indelible marking, or brand that
identifies the type, model, catalog number, and manufacturer.
Furnish
materials conforming to the following:
Ground
rod.............................................................. 625.16
Sealing,
conduit....................................................... 625.12
Cable and wire,
600-volt.......................................... 725.02
Conduit,
rigid........................................................... 725.04
Ballast......................................................................
725.11
Power
service.......................................................... 725.19
Disconnect Switch .................................................. 725.19
Switch Enclosure.....................................................
725.19
Changeable message sign,
electric type.................... 731.03
Internally illuminated
fixed message sign................ 731.05
Sign flasher
assembly.............................................. 731.06
School speed limit sign
assembly............................ 731.07
Conduit,
flexible...................................................... 731.08
Timer with
enclosure............................................... 731.10
631.04 Sign Service. Sign service consists of
all cable and other equipment to provide a complete electrical service from
either an underground or overhead source to the disconnect switch.
Route
sign service cable from a pull box to the switch enclosure for overhead
supported signs by means of underground conduit, foundation conduit ell, and
the interior of the structural member supporting the enclosure.
Route
sign service for overpass structure mounted signs through underground and
structure attached conduit terminating at a switch enclosure. Attach the
conduit by 0.02-inch (0.5 mm) thick by 3/4-inch (19 mm) wide passivated stainless steel straps spaced at intervals of
not more than 5 feet (1.5 m).
Route
sign service cable from a distribution system direct drop to the switch
enclosure by means of a conduit riser with weatherhead.
Form a drip loop into the cable. Use either a cast aluminum or galvanized
ferrous metal weatherhead of a threaded design.
Attach the conduit by straps as described in the previous paragraph.
For
sign service, use single conductor stranded copper. When the connection
is to highway lighting distribution and circuit cable, use the same cable for
sign service. In other applications, use sign service cable rated at 600
volts minimum and not smaller than 4 AWG.
631.05 Signs Wired. Ensure that signs wired
complete the electrical system from the disconnect switch to the luminaires.
Furnish
continuous wiring from the disconnect switch to a junction box mounted on the
sign support or overpass structure. Install junction box in a manner that
allows sign removal as a unit by the disconnection of the wires and the removal
of sign attachment hardware. Install a junction box for each sign.
Furnish
continuous wiring from the junction box to the first luminaire and between
additional luminaires.
Use
wire rated at 600 volts, single conductor and not smaller than 10 AWG.
Route
wire on overhead sign supports from the disconnect switch enclosure through
structural member interiors. Support wire hanging within the interior of
steel vertical members by looping over the J-hook provided. After wiring
in the disconnect switch enclosure, seal the nipple in the enclosure back with
self-fusing high-dielectric insulating compound.
Assemble
flexible or rigid conduit on the sign structure or lighting support arms with condulets, and attach them to the structure by clamps
located within 6 inches (150 mm) of each conduit end and separated by not more
than 24 inches (0.6 m).
631.06 Disconnect Switch. Install
lighted signs with a disconnect switch within a lockable, weatherproof
enclosure. For the switch, use a two-pole (minimum), single-throw, fused
safety disconnect type, rated at 600 volts, 30 amperes with the fuse size
as specified. Furnish a solid neutral bar.
For
the enclosure, use stainless steel NEMA 250, Type 4. Furnish space for a chase
nipple in the enclosure back. Field drill a hole
through the enclosure and install the nipple. Ensure that enclosures also
have a screened 1/4-inch (6 mm) diameter weep hole located in the bottom
surface.
Furnish
each enclosure with at least one padlock. Use padlocks with a bronze or
brass lock body and a corrosion protected steel
shackle. Key all padlocks for a project alike, and obtain the appropriate
master key number from the maintaining agency.
When
specified, furnish and install bracket assemblies on existing overhead sign
supports or on concrete structures. Use bracket assemblies made of steel,
galvanized according to 711.02, or
aluminum.
631.07 Luminaire. Include a lamp of the wattage
specified.
Locate ballasts
integral with the luminaire. Furnish weatherproof ballast housings made
from corrosion resistant materials.
631.08 Controls. When specified, furnish
photoelectric controls when sign lighting is fed by uncontrolled circuits.
When specified,
furnish and install the timer with enclosure to provide automatic school speed
limit sign operation.
631.09 Electrical Signs. Furnish
changeable message signs that conform to the Contract Documents. The pay
item will specify if the display capabilities are limited message or unlimited
message. The Contractor may use line units of these types as inserts in a
panel sign, singly or grouped to provide a multiline sign. Hardware and
software shall be complete to operate and maintain the sign.
Furnish
internally illuminated signs consisting of the single or double face
type. The sign support is furnished under another pay item. Furnish
suspended signs that hang plumb, are properly oriented, and locked in place.
Furnish sign
flasher assemblies consisting of a pair of flashing beacons. The sign,
support, and foundation are furnished under other pay items.
Furnish
school speed limit sign assemblies that conform to the Contract Documents.
School speed limit sign assemblies consist of a reflectorized SCHOOL SPEED
LIMIT 20 DURING RESTRICTED HOURS (S5-H1) sign fitted with a pair of flashing
beacons arranged above and below.
631.10 Removal. Carefully remove sign lighting
equipment (such as luminaires, disconnect switches, or ballasts) and electrical
signs. Removed items become the property of the Contractor.
631.11 Inspection and Testing. Ensure that
the sign lighting systems and electrical signs meet all requirements of the
ground, cable insulation, and performance tests specified in 625.19. Correct lamps, ballasts, and
transformers that failed during the performance test by replacing the faulty
component; the entire test period will not require restarting.
During
the performance test, make final adjustments to sign lateral position and
aiming angles of luminaires to eliminate excessive brightness and glare, and to
obtain optimum sign face reflected brightness, uniformity of illumination,
visibility, and legibility, to the satisfaction of the Engineer.
631.12 Method of Measurement. All of
the following methods of measurement include all hardware necessary to securely
mount the associated item including angles, plates, tubes and channels.
The
Department will measure Sign Service by the number of complete units for each
support, and will include conduit, conduit riser, weatherhead,
fittings, cables, trenching, and backfilling.
The
Department will measure Sign Wired and Sign Wired, Overpass Structure by the
number of complete units of wiring for each individual sign, and will include
junction boxes, rigid or flexible conduit, condulets,
clamps, wires, and connectors.
The
Department will measure Disconnect Switch with Enclosure by the number of each,
and will include field drilling and padlocks.
The
Department will measure Switch Enclosure Mounting Bracket Assembly by the
number of each, and will include two brackets and field drilling.
The
Department will measure Ballast and Photoelectric Control by the number of each
separate item.
The
Department will measure Luminaire by the number of each, and will include lamps
and luminaire attachment hardware.
The
Department will measure Changeable Message Sign by the number of each, and will
include cabinet, external enclosures, conduit, electrical, electronic and
auxiliary components, and remote control units to provide a fully functional
unit.
The
Department will measure Internally Illuminated Fixed Message Sign by the number
of each, and will include lamps and ballasts.
The
Department will measure Sign Flasher Assembly by the number of each, and will
include beacons, flasher control unit with enclosure, and lamps.
The
Department will measure School Speed Limit Sign Assembly by the number of each,
and will include sign, beacons, flasher control unit with enclosure, and lamps.
The
Department will measure Timer with Enclosure by the number of each, and will
include field drilling and padlocks.
The
Department will measure Removal of sign lighting equipment or electrical signs
by the number of each like items removed.
631.13 Basis of Payment. The
Department will pay for grounding systems under Item 625.
The
Department will pay for accepted quantities at the contract prices as follows:
Item
Unit
Description
631
Each
Sign Service
631
Each
Sign Wired
631
Each
Sign Wired, Overpass Structure
631
Each
Disconnect Switch with Enclosure, Type ___
631
Each
Switch Enclosure Mounting Bracket Assembly
631
Each
Ballast, Type ___
631
Each
Photoelectric Control
631
Each
Luminaire, Type ___, with ___-watt Lamp
631
Each
Changeable Message Sign, (Limited, Unlimited) Message
631
Each
Internally Illuminated Fixed Message Sign, Type ___
631
Each
Sign Flasher Assembly
631
Each
School Speed Limit Sign Assembly,
___ inches ´ ___ inches
(___ mm ´ ___ mm)
631
Each
Timer with Enclosure
631
Each
Removal of (Luminaire, Disconnect Switch, Ballast, etc.)