Make sure to use galvanically compatible metals in lightning protection system components and surface materials on which the components are mounted. For example, do not connect copper to aluminum. For more information, see Table 1.
|CAUTION Do not use together metals that are not galvanically compatible. Bad matching accelerates their corrosion in the presence of moisture.|
With aluminum conductors, use only connection devices designed for aluminum. Make sure to use the right fastening torque.
- Stainless steel
- Monel (nickel–copper alloy)
- Galvanized steel
- Stainless steel
- Wrought iron
- Galvalume (an aluminum-coated sheet steel product)
Table 1 lists generic guidance on materials and their use in different environments and conditions. Consider the conditions and requirements of individual sites when deciding on materials and their use.
|In Open Air||In Earth||In Concrete||Resistance||Increased by||May be destroyed by Galvanic Coupling with|
|Copper||Solid||Solid||Solid||Good in many environments||Sulphur compounds||–|
|–||As coating||As coating||–||–||–|
|Hot galvanized steel123||Solid||Solid||Solid||Acceptable in air, in concrete, and in benign soil||High chlorides content||Copper|
|Stranded 4||–||Stranded 4||–||–||–|
|Steel with electro-deposited copper||Solid||Solid||Solid||Good in many environments||Sulphur compounds||–|
|Stainless steel||Solid||Solid||Solid||Good in many environments||High chlorides content|
|Aluminum||Solid||Unsuitable||Unsuitable||Good in atmospheres containing low concentration of sulphur and chloride||Alkaline solutions||Copper|
|Lead 5||Solid||Solid||Unsuitable||Good in atmospheres with high concentration of sulphates||Acid soils||Copper|
|As coating||As coating||–||–||–||Stainless steel|