I. General
324.1 |
Scope |
The wiring covered in this article is a field-installed system to be used for branch circuits under carpet squares.
324.2 |
Definitions |
The reader is referred to the Code for these definitions.
324.6 |
Listing Requirements |
II. Installation
324.10 |
Uses Permitted |
It can be used for general-purpose, appliance, and individual branch circuits; on floors that are hard, sound, or smooth made of materials like or similar to concrete, ceramic, composition, and wood; on walls in surface metal raceways; in damp locations; and on heated floors where the temperature is higher than 86°F if approved for those temperatures.
The voltage ratings are up to 150 V to ground and up to 300 V between ungrounded conductors. The current ratings are up to 20 A for general-purpose and appliance branch circuits and up to 30 A for individual branch circuits.
When on a floor, it must be covered with carpet squares. Release-type adhesive only is permitted. If it exceeds 2.3 mm (0.09 in.) above floor level it must be feathered or tapered at the edges to floor level. There are other requirements for corrosion resistance and metal-shield connectors.
324.12 |
Uses Not Permitted |
It cannot be used outdoors, in wet locations, in classified hazardous locations, where there are corrosive vapors present, or in residential, school, or hospital buildings.
324.18 |
Crossings |
324.30 |
Securing and Supporting |
324.40 |
Boxes and Fittings |
324.41 |
Floor Coverings |
324.42 |
Devices |
324.56 |
Splices and Taps |
324.60 |
Grounding |
III. Construction
324.100 |
Construction |
324.101 |
Corrosion Resistance |
324.112 |
Insulation |
324.180 |
Markings |
Article 90 Introduction
General
Wiring and Protection
Wiring Methods and Materials
Equipment for General Use
Special Occupancies
Special Equipment
Special Conditions
Tables
Annex C. Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size
Annex D. Examples
Annex E. Types of Construction