Nec Cable Bending Radius
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Transcript of Nec Cable Bending Radius
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Engineering Technical Center
Okonite Home Page
Contact Okonite
.
The following are the minimum values for the radii to which insulated cables may be bent for
permanent training during installation. These limits do not apply to conduit bends, sheaves or
other curved surfaces around which the cable may be pulled under tension while being installed.
Larger radii bends may be required for such conditions to limit sidewall pressure. In all cases the
minimum radii specified refers to the inner surface of the cable and not to the axis of the cable.
The minimum bending radii for both single and multiple-conductor cable with or without lead
sheath and without metallic shielding or armor are as follows:
Power and control cables withoutmetallic shielding or armor
Thickness of
Conductor
Insulation
Inches
Overall Diameter of Cable,
Inches
1.000 and
Less
1.001 to
2.000
2.001 and
over
Minimum Bending Radius as
a Multiple of Cable Diameter
.156 and less 4 5 6
.157 to .315 5 6 7
.316 and
over 7 8
Twisted pair instrumentation cable
Minimum
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Type of Cable
Bending
Radius as a
Multiple of
Cable Diameter
Armored, wire type or corrugated sheath or interlocked type 7*
Non-armored, without shielded conductors 6
Non-armored, metallized-polyester or braid shielded 8
Non-armored, flat or corrugated tape shielded 12**
*With shielded Conductors 8
**For longitudinally applied corrugated shield with PVC
jacket15
Power and control cables withmetallic shielding or armor
Minimum Bending
Radius as a Multiple
of Cable Diameter
Type of Cable
Armored, flat tape or wire type
Armored, smooth aluminum sheath, up to;
...0.75 inches cable diameter
...0.76 to 1.5 inches cable diameter
...over 1.5 inches cable diameter
Armored, corrugated sheath or
...interlocked type
...with shielded single conductor
...with shielded multi-conductor
Non-armored, flat or corrugated
...tape shielded single conductor
...tape shielded multi-conductor
...multi-conductor overall tape shield
...LCS with PVC jacket
Non-armored, concentric neutral
Non-armored, flat strap shielded
Power
12...
.
10*.
12...
15...
.
7...
12...
**...
.
12...
**...
12...
15...
8...
8...
Control
12...
.
10*.
12...
15...
.
7...
12...
**...
.
12...
**...
12...
15...
—...
—...
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Non-armored, wire shielded ***.. —...
* with shielded conductors 12
** 12 times single conductor diameter
or 7 times overall cable diameter — whichever is greater
*** See Power and control cables without metallic shielding
above
LCS = longitudinally applied corrugated shield
Rubber jacketed flexible portablepower and control cables used ontake-up reels and sheaves
Type of Cable
Minimum Bending
Radius as a Multiple
of Cable Diameter
0 - 5 kV
Over 5 kV
6
8