The Table of Contents for this section is available.
The work covered by this section consists of the construction of junction boxes made from fiberglass reinforced polymer concrete as noted on the plans, complete with all necessary covers, conduits, duct, and hardware, in accordance with the requirements shown on the plans and the specifications.
The polymer concrete boxes shall be stackable, and shall have bolted covers and be sized as shown in the plans.
The polymer concrete material shall be an aggregate consisting of sand and gravel bound together with a polymer and reinforced with continuous woven glass strands. Minimum mechanical strength properties of the material shall be; 11,000 psi compressive, 1700 psi tensile, 7500 psi flexural.
The material shall meet minimum acceptance criteria for: chemical resistance, accelerated service exposure, simulated sunlight exposure, water absorption, flexural properties, and flammability in accordance with ASTM D543, D756, D1501, D560, D790, and D635 respectively.
Light vehicular traffic design shall be based on a 5000 pound load over a 10" x 10" area. Light vehicular design shall be provided.
The bottom box shall be open "footed" unless specifically noted as "closed" bottom on the plans.
A standard "Electric" logo shall be on the cover unless specifically noted otherwise on the plans. A minimum of 2 size 3/8" hex head stainless steel cover bolts and inserts shall be provided.
Backfill beneath and around the boxes shall be ABC in conformance with Section 1005.
The ground rod shall be 5/8" diameter, 8' long solid steel core with copper jacket. The ground rod clamp shall be one piece bronze with hex head screw. Both rod and clamp shall conform to UL Standard 467 "Electrical Grounding and Bonding Equipment".
Sealant for duct, conduit and the box cover shall be a putty-like compound which is non-hardening, non-oxidizing, and non-corrosive. It shall seal against the entrance of water, and shall have a service temperature range at minus 30F to 200F. It shall be clean, non-poisonous and non-injurious to human skin.
Conduits and duct shall be installed before the boxes are set in place.
Junction boxes shall be located as shown on the plans; except other locations, as approved by the Engineer, will be acceptable for better routing of conduit and duct, and to minimize drainage problems. Junction boxes are neither designed nor intended to be used where they would be subjected to roadway traffic loadings such in useable shoulders or pavements.
The bottom of the box shall not rest directly on conduits, ducts or cables.
The top of the box shall be on the same grade as the surrounding area except it shall be raised three inches (3") minimum to allow the backfill material to be sloped to prevent surface drainage from entering the box.
A ground rod shall be installed as indicated on the plans with bonding jumpers, etc. as required. Ends of conduit and duct shall be stubbed up vertical as near the top of the box as practical and shall be sealed. Wiring shall be arranged so that it will not lay in the bottom of the box.
Sealant shall be placed between the cover and box to prevent surface drainage from entering the top of the box.
1411-4 MEASUREMENT AND PAYMENT.
The quantity of electrical junction boxes to be paid for will be the actual number of junction boxes which have been installed and accepted. The quantity of electrical junction boxes, measured as provided above, will be paid for at the contract unit price each for "Electrical Junction Boxes __________" of the appropriate type and size. Such price and payment will be full compensation for all work covered by this section. Payment for the conduit, duct and wiring will be paid for under other contract items.
Payment will be made under:
Electrical Junction Boxes __________ Each