WCULPEPPER
Member
- Location
- Meridian,MS,USA
I'm sure I readit somewhere in the NEC that you can install a dry-type transformer in a suspended ceiling as long as it isn't larger than 50kVA, but now I can't find it again. Does anyone know where it is?
suspended ceilings
- Thread starter WCULPEPPER
- Start date
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450.13 Accessibility. All transformers and transformer vaults
shall be readily accessible to qualified personnel for inspection
and maintenance or shall meet the requirements of 450.13(A)
or 450.13(B).
(B) Hollow Space Installations. Dry-type transformers
600 volts, nominal, or less and not exceeding 50 kVA shall
be permitted in hollow spaces of buildings not permanently
closed in by structure, provided they meet the ventilation
requirements of 450.9 and separation from combustible materials requirements of 450.21(A). Transformers so installed shall not be required to be readily accessible.
Pete
shall be readily accessible to qualified personnel for inspection
and maintenance or shall meet the requirements of 450.13(A)
or 450.13(B).
(B) Hollow Space Installations. Dry-type transformers
600 volts, nominal, or less and not exceeding 50 kVA shall
be permitted in hollow spaces of buildings not permanently
closed in by structure, provided they meet the ventilation
requirements of 450.9 and separation from combustible materials requirements of 450.21(A). Transformers so installed shall not be required to be readily accessible.
Pete
WCULPEPPER
Member
- Location
- Meridian,MS,USA
I found 450.13 and though it would apply but I swear I thought I read some where about the suspended ceiling location. Must have dreamed about it.
Gregg Harris
Senior Member
- Location
- Virginia
- Occupation
- Electrical,HVAC, Technical Trainer
I found 450.13 and though it would apply but I swear I thought I read some where about the suspended ceiling location. Must have dreamed about it.
300.22 Wiring in Ducts Not Used for Air Handling, Fabricated Ducts for Environmental Air, and Other Spaces for Environmental Air (Plenums). The provisions of this section shall apply to the installation and uses of electrical wiring and equipment in ducts used for dust, loose stock, or vapor removal: ducts specifically fabricated for environmental air; and other spaces used for environmental air (plenums).
(C) Other Spaces Used for Environmental Air (Plenums). This section shall apply to spaces not specifically fabricated for environmental air-handling purposes but used for air-handling purposes as a plenum. This section shall
70-144 not apply to habitable rooms or areas of buildings, the prime purpose of which is not air handling.
Informational Note No. 1: The space over a hung ceiling used for environmental air-handling purposes is an example of the type of other space to which this section applies.
Informational Note No. 2: The phrase ?Other Spaces Used for Environmental Air (Plenum)? as used in this section correlates with the use of the term ?plenum? in NFPA 90A-2009, Standard for the Installation of Air-Conditioning and Ventilating Systems, and other mechanical codes where the plenum is used for return air purposes, as well as some other air-handling spaces.
(3) Equipment. Electrical equipment with a metal enclosure, or electrical equipment with a nonmetallic enclosure listed for use within an air-handling space and having adequate fire-resistant and low-smoke-producing characteristics, and associated wiring material suitable for the ambient temperature shall be permitted to be installed in such other space unless prohibited elsewhere in this Code.
There has been several industry white pages on this subject that you may have read.
Informational Note No. 2: The phrase ?Other Spaces Used for Environmental Air (Plenum)? as used in this section correlates with the use of the term ?plenum? in NFPA 90A-2009, Standard for the Installation of Air-Conditioning and Ventilating Systems, and other mechanical codes where the plenum is used for return air purposes, as well as some other air-handling spaces.
(3) Equipment. Electrical equipment with a metal enclosure, or electrical equipment with a nonmetallic enclosure listed for use within an air-handling space and having adequate fire-resistant and low-smoke-producing characteristics, and associated wiring material suitable for the ambient temperature shall be permitted to be installed in such other space unless prohibited elsewhere in this Code.
There has been several industry white pages on this subject that you may have read.
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