ABB Furse RB205-FU Earth Rod

Code: 7TCA083120R0024
  • Threaded copperbond earth rod
  • 5/8″ diameter
  • 1,200 mm length

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Three types of Furse earth rods are available. The RB205-FU copperbonded steel cored rod is the most popular due to its strength, corrosion resistance and comparatively low cost.

Quality earth rods are commonly made from either copperbonded steel, solid copper or stainless steel. Solid copper and stainless steel rods offer a very high corrosion resistance at the expense of lower strength and higher cost.

Copperbond rod  

Furse copperbond earth rods probably offer the installer the best and most economical.

Furse rods are made by molecularly bonding 99.9% pure electrolytic copper to a low-carbon steel core. They are not of the sheathed type. They are highly resistant to corrosion, and because the steel used has a very high tensile strength, they can be driven by power hammers to great depths.

The counter-bored couplings are made from high copper content alloy; commercial brass is not used.

Solid copper rod

Furse solid copper earth rods offer greater resistance to corrosion. They are ideally used in applications with very aggressive soil conditions, such as soils with high salt content.

Stainless steel rod

Stainless steel rods are used to overcome many problems caused by galvanic corrosion, which can occur between dissimilar metals buried nearby. Furse stainless steel earth rods are highly resistant to corrosion.

Thread and shank diameters

Confusion often arises between thread and shank diameters for threaded rods.

The thread rolling process, used by quality rod manufacturers, raises the surface of the rod so that thread diameter (B) is greater than shank diameter (A) (see drawing). All threads are Unified National Coarse (UNC-2A).

Diameter of rod

One common misconception is that the diameter of the rod has a drastic effect on lowering earth resistance. This is not true! Doubling the diameter of the rod only reduces the resistance value by 9.5% (which means increasing the weight and cost of the rod by approximately 400%).

Thus, the rationale is: Use the most economical rod that soil conditions will allow you to drive. This is one way to ensure you don’t waste money on over-dimensioned rods.

Part no. ABB order code Nominal diameter (”) Length (mm) Shank ‘A’ (mm) Thread ‘B’ UNC (”) Weight each (kg)
RB105 7TCA083120R0014 ؽ 1,200 12.7 9⁄16 1.18
RB110 7TCA083120R0016 ؽ 1,500 12.7 9⁄16 1.55
RB115 7TCA083120R0017 ؽ 1,800 12.7 9⁄16 1.76
RB125 7TCA083120R0019 ؽ 2,400 12.7 9⁄16 2.36
RB205-FU 7TCA083120R0024 Ø⅝ 1,200 14.2 1.53
RB210 7TCA083120R0028 Ø⅝ 1,500 14.2 1.88
RB215 7TCA083120R0034 Ø⅝ 1,800 14.2 2.29
RB220-FU 7TCA083120R0040 Ø⅝ 2,100 14.2 2.51
RB225 7TCA083120R0043 Ø⅝ 2,400 14.2 3.00
RB235 7TCA083120R0047 Ø⅝ 3,000 14.2 3.79
RB305 7TCA083120R0049 ؾ 1,200 17.2 ¾ 2.19
RB310 7TCA083120R0054 ؾ 1,500 17.2 ¾ 2.73
RB315 7TCA083120R0058 ؾ 1,800 17.2 ¾ 3.27
RB320-FU 7TCA083120R0063 ؾ 2,100 17.2 ¾ 3.83
RB325 7TCA083120R0066 ؾ 2,400 17.2 ¾ 4.35
RB335 7TCA083120R0069 ؾ 3,000 17.2 ¾ 5.44
UL Listed copperbond earth rod
RB225-UL 7TCA083120R0087 Ø⅝ 2,440 14.2 3.00
RB235-UL 7TCA083120R0092 Ø⅝ 3,048 14.2 3.79
RB325-UL 7TCA083120R0088 ؾ 2,440 17.2 ¾ 4.35
RB335-UL 7TCA083120R0089 ؾ 3,048 17.2 ¾ 5.44

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Title Size
RB205-FU Datasheet 90 KB

Additional information

Weight 0.09 kg