Bend Radius for MV Cable entering ATC Chamber

[JimmyDeanxs]

Hello,

I have a weird question about cable bend radius of 25kV 3/C & 3G cable entering a substation ATC chamber. I have a manufacturer recommended minimum bend radius of 21", structural team has left me approximately 12" from the top of the cabinet cable entry point to the top of the cable tray rung running above it. Question is, can the cable bend radius be fulfilled while entering the enclosure? Or does it have to be fulfilled before entering the enclosure so the cable enters on straight or perpendicular to the enclosure?

Unfortunately, I don't have a lot of resources or experience with these types of installations and EOR gives copy paste, "follow NEC requirements for bend radius" statements.

Any ideas or guidance is much appreciated.

 

[Julius Right]

See: NEC ARTICLE 328
Medium Voltage Cable: Type MV
Type MV cable shall be installed, terminated,
and tested by qualified persons.
Informational Note: Information about accepted industry practices
and installation procedures for medium-voltage cable are
described in ANSI/NECA/NCSCB 600-2014, Standard for Installing
and Maintaining Medium-Voltage Cable and in IEEE 576-2000,
Recommended Practice for Installation, Termination, and Testing of
Insulated Power Cables as Used in Industrial and Commercial Applications
.
328.30 Support. Type MV cable terminated in equipment or
installed in pull boxes or vaults shall be secured and supported
by metallic or nonmetallic supports suitable to withstand the
weight by cable ties listed and identified for securement and
support, or other approved means, at intervals not exceeding
1.5 m (5 ft) from terminations or a maximum of 1.8 m (6 ft)

IEEE 576/2000
IEEE Recommended Practice for
Installation, Termination, and Testing of
Insulated Power Cable as Used in Industrial and Commercial Applications
7.3 Shielded cables The minimum bending radius for all cables with metallic shield is 12 times the diameter of the individually shielded conductors or 7 times the overall diameter, whichever is greater.
For multiconductor or multiplexed single-conductor cables having individually shielded conductors,
the minimum bending radius is 12 times the diameter of the individually shielded conductor or 7 times
the overall diameter, whichever is greater.