Minimum Bending radius for Instrumentation cables and conduits

[NickParker]

I have the below conductors to be bunched together and passed in a PVC sleeve around 50 Meters. I have to check the minimum cable bend radius for both the conductors and the sleeve.

1) 16P X 16AWG - 2 Separate conductor (Shielded twisted pair cables Type TC XLPE insulated cables).
2) 1P X 16AWG - 3 Separate conductors (Shielded twisted pair cables Type TC XLPE insulated cables).
3) 2P X 16AWG - 1 Conductor (Shielded twisted pair cables Type TC XLPE insulated cables).

Does anyone can help me out if the NEC has a specific formula for minimum cable bend radius less than 600v (not 300.34) and not in a table?

 

[waross]

50 meters is not a sleeve, it is a conduit. A sleeve is a short piece of conduit or tubing to provide mechanical protection to a cable, often for a floor penetration.
Many sleeves are one foot to two feet long. A sleeve seldom exceeds five or six feet in length.
From the Canadian Electrical Code:
Radii of bends in conductors
The radii of bends in conductors shall be sufficiently large to ensure that no damage is done to the conductors
or their insulation, covering, or sheathing.

Radii of bends in raceways
(1) Where conductors are drawn into a raceway, the radius of the curve to the centreline of any bend shall be
not less than as shown in Table 7.
(2) Bends shall be made without undue distortion of the raceway and without damage to its inner or outer
surfaces.

Conduit bending tools will bend to an acceptable radius.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[7anoter4]

All above cable may be run in a minimum 2.5" conduit. The the minimum radius has to be 15" [NEC Table 2 Radius of Conduit and Tubing Bends]
According to manufacturer recommendations [see for instance Belden Cabling Solutions for Industrial Applications pag.88] the minimum bending radius has to be 10*overall dia.
Aircraft Electrical Wiring Interconnect System (EWIS) Best Practices[pag.11]:
The proper bend radius for wire on aircraft should be 10 times the outside diameter of the largest diameter wire in the bundle for one side supported (3 times for two sides supported.) Standard industrial practice and is in AC 43.13-1b.
In your case 16p of 16 AWG TC=1.035"[Bend.rad=10.4"]