Earthing clamps with scraping jaw (milling earthing lathe) (CLPBR-12 and CLPBR-16) are versions derived from the standard models or earthing clamps.
These special earthing clamps are provided with profiled jaws so that to allow the removal of layers of oxides, impurities and protective paint from the elements where they will be mounted, simultaneously with the tightening of the clamp, the ultimate goal of this operation for getting an appropriate contact resistance.
These clamp models are recommended for use on short-circuiting devices known to be applied in installations where ground plates include painted or rusted metallic elements. The most familiar examples of such circumstances are lattice poles for high voltage lines or on the painted bars of ground straps existing in power stations.
The body of earthing clamps is a copper-aluminium alloy cast item. The scraping jaw, the elastic elements of the pressing system and the driving screw are made of steel, zinc-coated against corrosion.
| Clamp type | CLAMP WITH SCRAPING JAW,
REDUCED VERSION (CLPBR-12) |
CLAMP WITH SCRAPING JAW,
NORMAL VERSION (CLPBR-16) |
| Code | P 2366-0-00 | P 2277-0-00 |
| Nominal short-circuit for t = 1 s Isc (kA) | 12 kA/1s | 16 kA/1s |
| Clamp body execution procedure | Cast body | Cast body |
| Material | Copper alloy | Copper alloy |
| Weight (kg) | 0.62 | 1.2 |
| Thickness of conductor bar where the phase clamp can be applied (mm) | 11 mm | 17 mm |