API API-SIEE Dumps Questions Answers

The correct answer isC. NFPA 70 requires thatmetal raceways and metal enclosures be metallically joined together into a continuous electrical conductor. This requirement is fundamental because threaded conduit systems are not only mechanical connections, but also part of theequipment grounding and bonding path. Applying Teflon tape or similar nonconductive thread sealant to conduit threads can interfere with electrical continuity across the joint, which defeats the code intent for bonding and grounding.

From an API source inspection and quality surveillance perspective, the inspector must verify that conduit systems, fittings, and enclosures are assembled in a way that preserves electrical integrity, especially where grounding continuity is critical for personnel safety, fault-current return, and hazardous-location protection methods. The use of Teflon tape is therefore not accepted as a general practice on threaded conduit connections because it can compromise the metallic path. Option A is incorrect because the rule is not limited to Class I, Division 2. Option B is incorrect because water exclusion does not override bonding requirements. Option D is also incorrect because Teflon tape does not create an approved explosion-proof vapor seal.

The correct answer isB. NFPA 70, which governs installation requirements for electrical raceway systems, limits conduit runs between pull points such as outlet boxes, junction boxes, conduit bodies, or pull boxes tono more than the equivalent of four quarter bends, or 360 degrees total. This rule applies to rigid metal conduit and is intended to ensure that conductors can be installed, pulled, and replaced without excessive mechanical stress or insulation damage.

From a source inspection and quality surveillance perspective, this requirement is important because conduit routing directly affects installation quality, conductor integrity, and maintainability. Excessive bends increase pulling tension and sidewall pressure, making conductor damage more likely during installation. Too many bends can also complicate future maintenance and cable replacement. During inspection of electrical systems, the source inspector verifies that conduit design, fabrication details, and installation-related drawings align with code requirements and do not introduce nonconforming field conditions.

Option A exceeds the code limit. Options C and D introduce bend-radius conditions that do not replace the fundamental NFPA 70 maximum of360 degrees between pull points. Therefore,Bis the verified answer.