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Cable Vault, Pull Box and Small Cable Vault Drainage Installation Details (IS-18)

Note: Include these details in the Contract Plans for any WSDOT Contract requiring drainage installation for Cable Vault, Pull Box or Small Cable Vault.

Drain Pipe Installation

This plan provides the necessary details to install drainage for Small Cable Vault, Pull Box or Cable Vault. 

View Plan Sheet (pdf 104 kb)

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Excavated trench
(Backfill not shown)
Drain Pipe 
(Backfill not shown)
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Existing sump drain
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The Sump Drain Installation is intended for new installation or when slope is adequate for drainpipe to reach daylight. (Preferred method)

The Side Entrance Retrofit is intended to retrofit an existing Vault or Pull Box when minimum of 2% slope for drainpipe to reach daylight cannot be achieved.

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(WinZip file contains the following file formats: .dgn, .dwg, and .doc files)

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