Beatrice Lang
Metal antioxidants are used to prevent oxidation in electrical connections, which can cause additional resistance to electrical current. Antioxidant paste is a grease applied to a surface to prevent oxygen and moisture in the air from causing oxidization. While some sources suggest that antioxidant paste is not required for electrical connections, others argue that it is necessary for safety reasons, especially with aluminum wiring. The use of antioxidant paste depends on the specific conductor type and the manufacturer's instructions.
| Characteristics | Values |
|---|---|
| Purpose | Prevents oxidation of metal conductors, reducing resistance to electrical current |
| Application | Greased or pasted onto metal surfaces to prevent oxygen and moisture contact |
| Compatibility | Specific pastes for aluminum and copper conductors; not suitable for mixed use |
| Effectiveness | Reduces oxidation and increases connection longevity |
| Safety | Does not harm conductor metal, insulation, or equipment when used per manufacturer instructions |
| Code Requirements | Not always required by code, but often encouraged or cited as a defect if missing |
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What You'll Learn
Antioxidant paste for aluminium wiring
Metal antioxidants are compounds used to prevent oxidation in metal conductors, which can cause additional resistance to electrical current. Antioxidant paste is a grease applied to a surface to prevent oxygen and moisture in the air from touching that surface.
Aluminium wiring is susceptible to oxidation due to its reaction with oxygen in the air. This oxidation can cause an increase in electrical resistance, leading to heat build-up and potentially, fires. To prevent this, antioxidant paste can be applied to aluminium wiring. The paste acts as a barrier between the aluminium and the surrounding air, preventing oxygen and moisture from reacting with the metal.
Antioxidant paste is specifically designed for aluminium conductors and should not be used with copper wires. Copper has a much slower buildup of oxide, and oxidation typically only becomes an issue when the copper is heavily tarnished. For aluminium conductors, it is recommended to use a suitable antioxidant electrical grease and wire oxide layer removal per the manufacturer's instructions.
It is important to note that the use of antioxidant paste with aluminium wiring is not always required. For example, pigtailing copper to aluminium with a solid wire does not necessitate the use of antioxidant paste. Additionally, some termination connectors do not require the use of antioxidant paste, but users should evaluate end-use conditions such as humidity, corrosion exposure, and temperature range extremes to determine if antioxidant paste is appropriate for their application.
When using antioxidant paste, it is crucial to follow the manufacturer's instructions and guidelines. The compound is conductive, so it should be used sparingly, and any excess should be removed. Proper surface preparation, such as cleaning the conductor with a wire brush or cloth, is also essential to ensure effective application.
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Antioxidant paste for copper wiring
Antioxidant paste is a grease applied to a surface to prevent oxygen and moisture in the air from interacting with it. This interaction is known as oxidation and can cause additional resistance to electrical current. Antioxidant pastes are made for use with both aluminium and copper conductors, but it is important to use the correct paste for the specific conductor type.
Copper has a much slower buildup of oxide than aluminium, so antioxidants are not usually used with copper conductors. Oxide buildup does not become a conductive issue until the copper is heavily tarnished. However, tarnished copper wire should never be used to make a wire connection. It is important to use freshly stripped copper or discard ends of wire that have been stored for a long time. This ensures a bright copper stranding and a new gas-tight wire termination joint.
Some sources imply that antioxidant paste must be used with all connections, including copper/stainless wire mechanical connections. For example, one source suggests using a copper antioxidant paste called Kopr Shield. Another source recommends using anti-oxide compounds Noalox and Deox, which are helpful on the threads of screw lugs.
It is important to follow manufacturer instructions when using antioxidant paste. The guidelines for these compounds can be found on the container.
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Aluminium wire manufacturers' instructions
Aluminium wiring is often considered less safe than copper wiring, but it can be made safer by applying an antioxidant paste. Antioxidant paste is a grease applied to a surface to prevent oxygen and moisture in the air from interacting with that surface, thereby preventing oxidization.
The use of antioxidant paste is not always required. For instance, it is not necessary when pigtailing copper to aluminium with solid wire, or when using 63 and 65 connectors. However, it is important to follow manufacturer instructions, as well as any relevant codes and standards, when installing aluminium wiring. Rule 12-118(2) requires that a joint compound be used with stranded aluminium conductor connections, but not with solid aluminium conductors. It is also recommended to coat the bare ends of solid aluminium conductors with an approved joint compound, although this is not required by code.
When using antioxidant paste, follow these steps:
- Use a wire brush or cloth to clean the conductor.
- Apply antioxidant paste to both the connector and conductor.
- Connect the joint and remove any excess compound.
Always seek help from a professional electrician before attempting any electrical work yourself.
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National Electrical Code (NEC) reference
Antioxidant compounds are used to prevent oxidation at the conductor/connector interface. Oxidation can cause additional resistance to electrical current. Antioxidant paste is a grease applied to a surface to prevent oxygen and moisture in the air from touching that surface. These compounds do not harm the conductor metal, insulation, or equipment when used correctly.
The National Electrical Code (NEC) does not have a specific requirement for the use of antioxidants on electrical connections. However, there are a few references in the NEC that are relevant to this discussion:
- NEC 110.3(B): Installation and Use states that "Equipment that is listed, labelled, or both shall be installed and used in accordance with any instructions included in the listing or labelling." This means that if a manufacturer's instructions recommend the use of an antioxidant compound, then it is required for installation and use.
- NEC 110-14 mentions inhibitors but does not mandate the use of antioxidants.
- The Aluminum Association, along with the National Electrical Contractors Association, developed the NEIS Standard (National Electrical Installation Standard), which is also known as NECA/AA 104-2000. This standard recommends "Wire brush the conductor and apply a listed joint compound." This supports 110.12 "Mechanical Execution of Work," but it is not mandatory.
It is important to note that while the NEC does not specifically require antioxidants, many manufacturers recommend their use. The guidelines for the use of these compounds can be found on the product label or the container. It is always recommended to follow the manufacturer's instructions to ensure safe and proper installation.
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Anti-oxidation compounds
Antioxidant compounds are used to prevent oxidation in metal conductors, which can cause additional resistance to electrical current. These compounds are typically in the form of a grease or paste applied to the surface of the conductor, creating a barrier that prevents oxygen and moisture in the air from coming into contact with the metal and causing oxidation.
While some sources suggest that the use of antioxidant compounds is not always required, especially with solid aluminium conductors, it is generally recommended for stranded aluminium conductor connections. This is because aluminium is more susceptible to oxidation, which can lead to electrical fires if left untreated. The antioxidant compounds help to reduce oxidation at vital connection points, increasing the longevity of the electrical components.
It is important to note that different types of metals require specific antioxidant compounds. For example, aluminium wire manufacturers typically recommend using suitable antioxidant electrical grease, while copper conductors, which have a slower buildup of oxide, usually do not require antioxidants unless heavily tarnished.
The use of antioxidant compounds should be done in accordance with manufacturer instructions, as incorrect installation can lead to issues. These compounds are designed to be conductive, so they should be used sparingly, and any excess should be removed. Additionally, it is important to follow proper torque specifications to ensure effective results.
By utilising antioxidant compounds correctly, electricians can improve the safety and performance of electrical connections, preventing oxidation and reducing the risk of electrical fires.
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Frequently asked questions
Metal antioxidants are compounds that prevent oxidation at electrical connections. They are usually applied in the form of a grease or paste to prevent oxygen and moisture from reaching the surface of the metal.
Oxidation can cause additional resistance to electrical current, which can lead to electrical fires. Antioxidants increase the longevity of electrical connections and prevent such issues.
No, it depends on the type of metal and manufacturer instructions. For instance, copper conductors/wires do not usually require antioxidants due to their slow buildup of oxides. However, for older panels and wiring, antioxidants are essential to prevent fires.
It is important to follow manufacturer instructions for electrical connections. Some manufacturers now do not require antioxidant pastes for their products. However, in some cases, building officials may insist on the use of antioxidant paste for safety reasons.
