FieldSmart
®
Fiber Active Cabinet (FAC) 400
Installation Manual
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Proprietary Information: Not for use or disclosure except by written agreement with Clearfield.
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Installing a Foundation Vault
A foundation vault constructed of composite materials provides a flexible cabinet mounting option. Because foundation
vaults stand approximately three feet tall, you can either bury the vault below ground to provide a pad-like mounting fixture
with underneath access for maintenance and splice case storage, or you can install the vault above ground to serve as a
riser in areas subject to heavy snow, mud, or flooding.
Installing a foundation vault requires excavating the installation site, trenching cable conduit, creating a gravel foundation
base, and placing the vault on the foundation base.
Foundation vaults ship configured with knockouts for conduit entry and mounting fixtures (threaded inserts) for anchoring
the cabinet to the top of the vault. Specific features and dimensions vary by manufacturer and model. Contact your sales
representative for Clearfield -certified supplier information.
Foundation Vault Requirements
When preparing for and installing a foundation vault, observe the following guidelines. Refer to the vault drawings
for guidance.
Guidelines
Follow these guidelines to ensure proper foundation support for the cabinet. Adjust for local conditions or practices
as required.
• Foundation vaults have a typical height of 36 inches, the depth of which to bury can vary:
• When serving as an above-ground riser, install the vault at least 6 inches below-grade (typical).
•
When serving as a pad-like fixture, install the vault with a minimum of 1 inch above-grade exposure (typical).
• Use 2.5-inch conduit (maximum) for outside plant cables. See drawing below for entry locations.
• Use 1-inch conduit (maximum) for AC cable. See drawing below for entry location.
• Include pull cords in all cable conduits.
Refer to the vault manufacturer’s instructions for additional guidelines