FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Which substance can reduce the possibility of damage when pulling electrical cables through rigid conduit?

  1. Lubricating oil

  2. Powdered soapstone

  3. Water

  4. Grease

The correct answer is: Powdered soapstone

When pulling electrical cables through rigid conduit, using a lubricant such as powdered soapstone can help reduce the possibility of damage. Powdered soapstone acts as a dry lubricant that decreases the friction between the cable and the conduit walls, making it easier to pull the cable through without causing abrasions or other damage. This is why powdered soapstone is the most suitable substance for this purpose. Water is not suitable for this application as it can cause corrosion and damage to the electrical cables. Grease, while a lubricant, may attract dirt and debris, leading to potential issues with the electrical system. Lubricating oil, although a common lubricant, may not provide the same level of dry lubrication and friction reduction as powdered soapstone specifically designed for pulling cables through conduit.