Nec Cable Bending Radius

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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 withoutmetallic shielding or armor

Thickness of

Conductor

Insulation

Inches

Overall Diameter of Cable,

Inches

1.000 and

1.001 to

2.001 and

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

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

Control

—...

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

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

Nec Cable Bending Radius

Documents

Transcript of Nec Cable Bending Radius

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