Box-Fill Calculations, Part XI

摘要

The National Electrical Code contains provisions that limit the numbers and sizes of conductors that can be installed in boxes and conduit bodies. Article 314 covers the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, depending on their use. Specifications for calculating the number of conductors in outlet, device, junction boxes and conduit bodies are in 314.16. While box-volume calculations are in 314.16(A), box-fill calculations are in 314.16(B). Provisions pertaining to conduit bodies (also referred to as condulets) are in 314.16(C). Boxes and conduit bodies enclosing conductors larger than 6 AWG (American Wire Gauge) must comply with the provisions of 314.28. Code in Focus columns in March and April covered some of the general requirements for conduit bodies in 314.16(0(1). This month, the discussion continues with conduit bodies.