Cable Sizing; Splicing The Cable; Fitting The Cable Plug To The Motor - Grundfos 5SQ-90 Installation And Operating Instructions Manual

5. Cable sizing

Single-phase 60 Hz maximum cable length motor service to entrance:
Motor rating
Volts hp
115 0.5
230 0.5 300
230 0.75
230 1.0
230 1.5

6. Splicing the cable

Splice the drop cable with the motor cable. If the
splice is carefully made, it will be as efficient as any
other portion of the cable and will be completely
watertight.
There are a number of cable splicing kits available to-
day - epoxy-filled, rubber-sealed, etc. Many perform
well if the manufacturer's directions are followed
carefully. If one of these kits is not used, we recom-
mend the following method for splicing the motor
cable to the drop cable:
1. Examine the motor cable and the drop cable care-
fully for damage.
2. Cut the motor leads off in a staggered manner.
3. Cut the ends of the drop cable so that the ends
match up with the motor leads.
Be sure to match the colors.
4. Strip back and strip off one inch of insulation from
each lead, making sure to scrape the wire bare to
obtain a good connection.
Be careful not to damage the copper conductor
when stripping off the insulation.
5. Insert a properly sized Sta-Kon™-type connector
on each pair of leads, again making sure that col-
ors are matched.
Using Sta-Kon™ crimping pliers, indent the lugs.
Be sure to squeeze down hard on the pliers, partic-
ularly when using large cable.
6. Form a piece of electrical putty tightly around
each Sta-Kon™. The putty should overlap on the
insulation of the wire.
7. Use a good quality tape such as #33 Scotch Water-
proof or Plymouth Rubber Company Slipknot Grey.
Wrap each wire and joint tightly for a distance of
about 2½ inches on each side of the joint.
Make a minimum of four passes over each joint
and overlap each pass approximately one inch to
ensure a completely watertight seal.
Note: Do not lower or lift the pump using the motor
cable.
14 12 10
65 100 160
480 760
190 300 470
140 220 350
130 210 330
Copper wire size
8 6 4
260 410 660
1210 1930 3060
750 1190 1890
560 890 1420
520 830 1320

7. Fitting the cable plug to the motor

The cable plug supplied with the motor is factory-
greased. Check that the plug is greased correctly,
see fig. 5.
Fig. 5 Greasing of plug
To fit the cable plug, proceed as follows:
1. Check that the cable is of the correct type, cross-
section and length.
2. Check that the mains on the location has correct
connection to ground.
3. Check that the motor socket is clean and dry.
4. Press the cable plug onto the motor socket.
The plug will only fit one way, see fig. 6.
5. Fit and tighten the four screws, see fig. 6.
When the plug has been fitted, there must not be
a clearance between the motor and the cable plug.
Fig. 6 Fitting the cable plug
2 0 00
1050 1680
4870
3010 4800
2260 3600 4540
2110 3360 4230
7