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Calculation for cable pulling tensions & sidewall pressure S t d .of 5 2IEEE 5 -1 9 8 The calculations are preformed in accordance with the IEEE Std. 525-1992 (Revision
IEEE guide for the design and installations of cable system in substations. Purpose To calculation for cable pulling tensions & sidewall pressure of the longest cable. 1. Data 1.1 Duct bank Type
HDPE
Inside diameter (D)
144.6 mm 5.6929 in.
Cross section area (AD) 25.4542 in.
2
1.2 Cable Configgulation
Three cables cradled
Type
22 kV XLPE Copper cable
Size
249mm
2
Outsize diameter (d)
42 mm 1.6535 in.
Cross section area (Ad) 2.1474 in.
2
Weight (w)
3.35 kg/m 2.2514 lb/ft
2. General calculations 2.1 Conduit fill (3*ad/AD)*100 %
Fill (%)
25.3095
%
Allowable fill limits of 40 % for one cable 2.2 Jam ratio (J) This inside diameter of a field bent conduit is usually increased by 5% J
1.05*D/d % 3.62 %
Jamming cannot occur (>3.0) 2.3 Maximum allowable pulling tension K A
8 lb/kcmil 473.653 kcmil
Tmax
2*K*A lb
Tmax
7578.4488 lb
(Tension strength of Copper) (Cross section area of conductor) (The maximum permitted tension)
7 )
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When using a basket-weave type pulling grip applied over a lead-sheathed cable,
s
fo llo w
-500 lb/ft for single-conductor power cable #8 AWG (8.37 mm ) and smaller 2
-300 lb/ft for single-conductor power cable #6 AWG (13.3 mm ) and larger 2
Cable head grip Cable feed-in
Duct bank
Pulling lubricant
NASCO
The coefficent of friction
f=
0.3
Reel back tension on cables
T1 =
100
Configgulation
Three single cables in triangular configuration
lb
Weight correction factor ( c ) c=
1+ 4/3 * (d/(D-d) ) 2
1.2234 Length of Cable, m
Length of Cable, ft Tension, lb T1+(Length of cable * w * f * c)
20
65.6
154.22 lb
69.94
50
164.1
235.56 lb
106.83
100
328.1
371.12 lb
168.31
200
656.2
642.23 lb
291.26
300
984.3
913.35 lb
414.22
500
1640.5
1,455.58 lb
660.13
This is within the maximum allowable tension of 1500 lb
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io n
o f IE E E
Std. 525-1987)
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