Sealing Open Ducts

Sealing Open Ducts
This article is an interpretation of the 2002 National Electrical Code

. Please verify this
information with all local inspection agencies.
25701 Science Park Drive
Cleveland, Ohio 44122
216-464-3400
1-800-3CARLON (322-7566)
www.carlon.com
According to the 2002 National Electrical Code, Article 300.7, cable, raceways or
sleeves subject to different temperatures and condensation shall be sealed…
300.7 Raceways Exposed to Different Temperatures.
(A) Sealing. Where portions of a cable, raceway, or sleeve are known to be
subjected to different temperatures and where condensation is known to
be a problem as in cold storage areas of buildings or where passing from
the interior to the exterior of a building, the raceway or sleeve shall be
filled with an approved material to prevent the circulation of warm air to a
colder section of the raceway or sleeve. An explosion proof seal shall not
be required for this purpose.
Carlon

…offers a wide range of plugs, duct plugs, and split plugs in a variety of
styles and sizes to accommodate most installation requirements. Products
include Reducer Plugs, Plugs, Plugs with Pull Tabs, Universal Duct Plugs
(Blank), and Split Plugs for Innerduct/Cable Sealing.
Gross Automation [phone] · www.carlonsales.com · [e-mail]