Okonite wire and cable - bending radius
Installation Practices
Minimum Bending Radii

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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 without
metallic 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



Type of Cable

Minimum 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 jacket 15

 

Power and control cables with
metallic 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

Non-armored, wire shielded

Power
12...
.
10*.
12...
15...

.
7...
12...
**...

.
12...
**...
12...
15...

8...

8...

***..

Control
12...
.
10*.
12...
15...

.
7...
12...
**...

.
12...
**...
12...
15...

...

...

...

* 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 portable
power and control cables used on
take-up reels and sheaves



Type of Cable

Minimum Bending
Radius as a Multiple
of Cable Diameter

0 - 5 kV

Over 5 kV

6

8

 


ENGINEERING TECHNICAL CENTER

Every effort has been made to ensure the accuracy of this presentation.
However, information is subject to change. Not responsible for typographical errors.

The Okonite Company
102 Hilltop Road
Ramsey, New Jersey 07446
Phone 201-825-0300
Fax 201-825-3524
info@okonite.com

Made In the USA