PAL-AT Installation Manual
74
3. Connect one of the megger test leads to the red wire and the other lead to the pipe. The reading
should be “open” or greater than 20 megohms.
4. Check the white wire in a similar manner.
5. Connect one of the megger test leads to the red wire and the other lead to the white wire. The reading
should be “open” or greater than 20 megohms.
6. A good cable will have a reading of at least 20 megohms. If any reading is less than 20 megohms,
check the last connection for a short and repair the problem. The wire insulation may be damaged or
adhesive lined shrink tubing was not installed over a splice and the condition must be corrected.
10.5.3 Insulation Test with Wet Cloth
This insulation test checks for a short between the red and white wires or from either wire to the pipe. This
test should be performed when the ATP splice connections are completed at each field joint, before the
field joint insulation and jacket are installed.
The ATP cable must be disconnected from the PAL-AT panel when conducting the
insulation tests or damage to the equipment will result. A 500-volt megger is used to
measure the resistance between the wires and the carrier pipe. Make sure no one is
touching the wet cloth when the megger test is conducted.
7. If the jumper wire used in the continuity test is still installed, remove it.
8. Perform this test at the unconnected end of the length of ATP just added to the sensor string.
9. Place a saturated cloth on the splices and exposed ATP cable at the field joint. The water will enter
any damaged wire insulation and cause a low megger reading.
10. Connect one of the megger test leads to the red wire and the other lead to the pipe. The reading
should be “open” or greater than 20 megohms.
11. Check the white wire in a similar manner.
12. Connect one of the megger test leads to the red wire and the other lead to the white wire. The reading
should be “open” or greater than 20 megohms.
13. A good cable will have a reading of at least 20 megohms. If any reading is less than 20 megohms,
check the last connection for a short and repair the problem. The wire insulation may be damaged or
adhesive lined shrink tubing was not installed over a splice and the condition must be corrected.
14. Remove the wet cloth and dry the pipe before insulating the field joint.
10.6 Start of Run
The initial length of ATP cable from the PAL-AT panel is connected to the ATP cable at the start of the
pipe run as shown in figure 10-1.
The ATP cable should be connected to the cable plug in the PAL-AT panel as follows:
Before connecting the cable to the plug, route the excess cable in the enclosure so there will not
be excessive strain or twisting at the terminals. Connect the ATP red wire to the center terminal of the
cable plug. The white wire should be connected to either of the side terminals of the plug. Insert the plug
into the appropriate receptacle as shown. When removing the cable, grip the plug and pull it straight out
of the receptacle. Note the plug and receptacle are polarized so they can only be connected one
way.
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