External splice boxes require a 4in grommet 6.25in down. Standard location for internal splice boxes is 6in down. For grommets used with internal splice boxes, determine the nipple size being used, either 1in or 1-1/4in SB1 through SB4 requires a 1in grommet. Step 4: Determine requirements for splice box and grommet.
For existing installations, only 1in above grade is necessary. Note: This includes 2in for settling in new installations. The top of the riser should extend a minimum 3in above the finished grade level. Step 3: Determine the height of the riser. Step 2: Verify that the riser diameter is compatible with the riser tank adapter and tank hole size. Note: We recommend a 30in diameter riser when the depth is greater than 3ft. Effluent filters typically require a minimum 18in diameter access riser.Duplex pump systems require a 30in diameter access riser.Simplex pump systems require a minimum 24in diameter access riser.Step 1: Determine the diameter of the riser needed for your application: Electrical splice boxes/junctions safely house spliced wire connections between an electrical control panel and equipment such as effluent pumps and float switches.
Bulk pipe available in 13ft (3.96m) sections for 12in and 18in nominal diameter (300mm and 450mm DN) pipe and in 14ft (4.27m) sections for 24in nominal diameter (600mm DN) pipe.Heights available in 3in (76mm) to 13ft (3.96m) nominal increments for 12in and 18in nominal diameter (300mm and 450mm DN) risers and to 14ft (4.27m) nominal increments for 24in nominal diameter (600mm DN) risers.Available in 12in, 18in, and 24in nominal diameters (300mm, 450mm, and 600mm DN).This means that a 24’’x 14’’ riser kit has an inner diameter of 24 inches and a height of 14 inches. The first number in their names is their inner diameter in inches, and the second number is their height in inches. Ultra Rib Access Risers are used to provide access to tanks and also as valve enclosures in water and wastewater systems. 24' x 14' Septic Tank Riser Kit Overview: Our septic tank riser kits are measured by their inner diameter and height.
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