Grounding short section of metallic conduit or raceway used solely for protecting NM from physical damage without junction?
You don't have to bond the conduit if it's only there to &quot;provide support or protection of cable assemblies from physical damage&quot;, according to 250.86 ex. 2.

National Electrical Code 2014
Chapter 2 Wiring and Protection
Article 250 Grounding and Bonding
250.86 Other Conductor Enclosures and Raceways. Except as permitted by 250.112(I), metal enclosures and raceways for other than service conductors shall be connected to the equipment grounding conductor.
Exception No. 2: Short sections of metal enclosures or raceways used to provide support or protection of cable assemblies from physical damage shall not be required to be connected to the equipment grounding conductor.