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Arc Protection Ground
TYPE APD
ARC PROTECTION FOR COVERED PRIMARY CONDUCTOR
ARC PROTECTION FOR COVERED PRIMARY CONDUCTOR
| Aluminum |
|---|
| APD |
- The APD helps prevent lightning induced burndowns of covered overhead aluminum primary conductors and allows users to comply with Article 276 of the National Electric Safety Code, 1981 Edition.
- The device protects covered conductor by shielding it from the usual concentration of arc energy generated during a lightning strike. Without the device, such arcs can puncture the conductor cover and ground to the neutral leaving a short section of conductor strands that are either completely destroyed or badly eroded and seriously weakened. (Conventional overcurrent protection equipment does not operate fast enough to protect these lightning exposed conductors.) APD lightning protectors add mass of the correct shape to the conductor in the area where it absorbs the terminus of arc energy. It is thus a partially sacrificed component during each strike yet retains enough of its original mass and configuration to accommodate several strikes without losing effectiveness or allowing the adjacent line insulator to be splattered with damaging metallic particles.
- APD lightning protectors are both laboratory tested and field proven with the same successful results. They are offered in two models. The high energy APD-80 model is designed to withstand multiple operations at 21,000 amperes fault current for ten (10) cycles without conductor damage. A low-energy APD-57 model is available for applications where fuses limit the destructive energy by clearing the fault more rapidly than circuit breakers.
| Material: | Castings - Aluminum alloy |
|---|---|
| Hardware-APD57-galvanized steel | |
| APD80-stainless steel | |
| Note: | A radial circuit requires an APD protector on the load side of the insulator only, while other circuit configurations, such as loops, require that they be installed on both sides of the line insulator. In both situations, they must be installed on all conductor phases and positioned outside the end of a tie wire. The covering must be stripped away over this distance including the area within the confines of a tie wire. Since an arc from one phase to the neutral will often expand to fault all three phases, the device must be installed on all three phases. |
| CATALOG NUMBER (WITH INHIBITOR) | MAX. O.D. OF CABLE JACKET-INCHES | CONDUCTOR RANGE O.D. IN INCHES | DIMENSION B-INCHES (MM) | APPROX. WT. 100 LBS. (KG) |
|---|---|---|---|---|
| (1) APD57XB (Fused circuits) | 0.906 | #1-4/0 STR. AAC #2-4/0 ACSR 0.31-0.57 | 1.06 (27) | 24 (11) |
| APD80XB | 1.200 | 2/0-556.5 Str. AAC 1/0-477 (18/1) ACSR 0.39-0.86 | 1.87 (48) | 66 (30) |
|
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