FOUR-WAY, MERCURY VAPOR

Specification

1.0 Four-Way, Mercury Vapor Internally Illuminated Traffic Signs

1.1 Standard size 24” x 30” (custom sizes are available upon request).

1.2 Messages—All standard traffic sign messages are available.

2.0 General Description

2.1 Four-way traffic signs shall be capable of displaying four messages in four directions, at one time.

2.2 Messages shall be permanently visible. Daytime illumination is not necessary.

2.3 Four-way traffic signs are serviceable from either of the two access doors, and all components shall be easily accessible.

3.0 Functional Requirements

3.1 All messages shall be clearly legible, attracting attention under any lighting conditions.

3.2 The sign shall consist of an aluminum sign housing and two door assemblies; four traffic sign faces (blank or printed messages); complete electrical enclosures; all necessary hardware (less final mounting); and lighting system.

3.3 Lighting will be provided by one (1) 250-watt mercury vapor lamp, deluxe white.

3.4 All ballasts shall be encased and potted, and shall be provided by a major manufacturer with proven dependability. Ballasts shall be rated 250 watts, 120 volts, 2.4 amps, 60 cycle.

3.5 Sockets shall be porcelain, mogul base with a ½” pipe nipple mounting.

3.6 All wiring shall be 600 volts, 90°C, #18 AGW soft annealed copper wire.

3.7 All wire connections shall be made with insulated, compression wire nuts.

3.8 All primary wiring terminations shall be made to a barrier type terminal block.

3.9 An internal on/off switch shall be provided for maintenance.

4.0 Mechanical Construction

4.1 The basic sign housing shall consist of a top and a bottom pan formed from 3003 T-12 aluminum sheet, .063” in thickness.

4.2 Top and bottom pans are continuous TIG (Tungsten Inert Gas) welded in each corner to four legs of 6063 T-6 extruded aluminum.

4.3 Internal framing consists of four 1 1/2” x 1 1/2” x 1 1/8” aluminum angles bolted to the top pan and welded to each of the four legs, then bolted through the top pan to a 1-1/2" iron mounting hub.

4.4 Wire entry shall be through the mounting hub into the lamp box containing the terminal block.

4.5 Bottom reinforcement shall be achieved by the ballast shelf, formed of .063” aluminum and riveted to the bottom by ten (10) 3/16” x 3/8” aluminum barrel rivets.

4.6 Wire shall be routed through a 3/8” aluminum flexible conduit from the ballast to the lamp box in the top of sign.

4.7 A light diffuser of 1/8” prismatic polycarbonate plastic shall be mounted around the bulb. This diffuser shall provide even lighting to each of the four sign faces.

4.8 Two doors of .125” extruded aluminum shall have one side removable to gain access to the sign face. (No required for normal maintenance).

4.9 The two doors shall be mounted to two opposite sides of the sign case, each by two 3” x 1 1/16” open aluminum hinges, and one #3, stainless steel quarter-turn link lock.

4.10 The remaining sides shall have face retainers fabricated of .063” aluminum. The retainers shall be bolted to the housing bottom by two #10, 24 x 1/2" stainless steel nuts and bolts and shall secure the sign face into its track.

4.11 Drainage shall be provided by four 1” drain screens located at the corners of the housing bottom.

4.12 Finish on sign housings shall be two coats of exterior sign enamel, applied after the surface material is acid-etched and primed with zinc-chromate primer.

4.13 Sign face shall be of .125” white translucent polycarbonate with messages printed on the exterior.

For more information, contact

Jim Livingston livingston52@sbcglobal.net

or Christy Merkel cmerkel@trafficsignsinc.com.

Thank you for your interest!

Last Updated: October 2006