358.30 Securing and Supporting. EMT shall be installed as a
complete system in accordance with 300.18 and shall be
securely fastened in place and supported in accordance with
358.30(A) and (B).
(A) Securely Fastened. EMT shall be securely fastened in
place at intervals not to exceed 3 m (10 ft). In addition, each
EMT run between termination points shall be securely fastened
within 900 mm (3 ft) of each outlet box, junction box, device
box, cabinet, conduit body, or other tubing termination.
Exception No. 1: Fastening of unbroken lengths shall be permitted to be
increased to a distance of 1.5 m (5 ft) where structural members do not
readily permit fastening within 900 mm (3 ft).