24
MS Motors
Electrical Installation
Submersible Power Cable
Power is transmitted from the starter/controller to the
submersible motor through a marine duty power cable,
typically consisting of three flexible stranded conduc-
tors of the proper size to carry the motor full load
amperes (FLA) at its rated voltage. AWWA standards
require a separate ground wire to be provided (ie. 3-
wire cable systems are equipped with three power
conductors and a ground wire of the same size).
Proper cable selection is a function of motor load,
voltage, available space, length (setting depth) and
environment.
Typical conductor insulation materials are synthetic
rubber (RW, RUW, TW, etc.), plastic (PVC, XPLE, etc.)
or special polymer (FPE, hypalin, EPR - EPDM, etc.).
Special cable insulations are often recommended or
required for sever duty or special applications such as;
gas, hydro - carbon, heat, variable frequency, etc.
Cable can be provided as three or more separate indi-
vidual or, twisted conductors, molded side by side in a
flat cable configuration or three conductors with a round
common jacket. Refer to Table 4 for general submers-
ible power cable physical data (weight and diameter).
Armored cable is also available for special applications,
but is typically not employed in the water supply
industry. Cable is supported and attached to column/
drop pipe by means of cable clamps, tape or bands.
One extra foot of cable for each fifty feet of length
should be allowed plus an additional ten to fifty feet for
surface connections.
(Table 4) Typical Submersible Power Cable Physical Data
Cable Size
600 Volt (115, 208, 230, 460 and 575 Volt Motors)
5000 Volt (2300 Volt Motors)
Type I
Type II
Type III
Type IV
3 Conductors and ground in a
Common Jacket (4 wire total)
3 Conductors and ground in Sep-
arate Jackets (4 wire total)
3 Conductors in a Common
Jacket (3 wire total)
3 Conductors in Separate
Jackets (3 wire total)
AWG
MCM
O.D. (in)
Wt. (lbs./ft.)
O.D. (in)
per Cable
Wt. (lbs./ft.)
for 4 Cables
O.D. (in)
Wt. (lbs./ft.)
O.D. (in)
per Cable
Wt. (lbs./ft.)
for 3 Cables
14
.39
.16
.19
.10
12
.43
.20
.21
.13
10
.64
.32
.27
.18
8
.76
.44
.31
.29
1.02
.69
.39
.43
6
.91
.65
.36
.43
1.10
.85
.43
.52
4
1.02
.90
.42
.64
1.21
1.12
.47
.71
2
1.15
1.26
.48
.97
1.33
1.46
.53
.99
1
1.34
1.68
.58
1.26
-
-
-
-
0
1.43
2.0
.62
1.54
1.51
2.09
.62
1.49
00
1.53
2.41
.67
1.91
1.61
2.56
.66
1.87
000
1.64
2.89
.72
2.36
-
-
-
-
0000
1.80
3.58
.78
2.93
1.82
3.40
-
-
250
1.97
5.88
.90
4.82
-
-
-
-
300
2.09
6.60
.95
5.62
-
-
-
-
350
2.20
7.34
1.00
6.50
2.51
4.8
-
-
400
2.34
8.18
1.05
7.25
-
-
-
-
500
2.25
9.30
1.13
8.87
-
-
-
-
1. Types I and II cables are typically insulated and jacketed with synthetic rubber, PVC or XLPE.
2. Types II and IV are often supplied paralleled in a flat cable configuration, or in a twisted configuration for smaller sizes.
Type I and II cable include 3 power conductors and a ground conductor.
3. AWWA minimum stranding and insulation requirements; No. 10 and smaller - 7 strand/ Class B, No. 9 through No. 2 - 19 strand/ Class C, No. 1
through 4/0 - 19 strand/ Class B. Minimum conductor area to meet minimum ICEA (Insulated Cable Engineers Association) code for operation in free air.
4. Verity actual cable weight per foot with manufacture for greater accuracy, as weight and diameter will very with insulation system and manufacture.
MS.book Page 24 Wednesday, January 26, 2005 3:25 PM
Содержание MS 4000
Страница 1: ...GRUNDFOS PRODUCT GUIDE MS Submersible Motors 60 Hz...
Страница 47: ...47...
