ICC 500 - 702.6

[anbm]

Does anyone has a detail to meet this code rule?
Enclosed metal surfaces within tornado shelters shall be electrically bonded and grounded where required by article 250 of NFPA 70 or by the AHJ.

 

[anbm]

correction made below....

Exposed metal surfaces within tornado shelters shall be electrically bonded and grounded where required by article 250 of NFPA 70 or by the AHJ.

 

[don_resqcapt19]

Are the exposed metal parts likely to become energized? If so they would be required to be bonded by the EGC of the circuit that could energize the metal parts. If not, there is no bonding requirement.
The following is the definition of likely to become energized. Note this is in the 2023, has been in the NEC style manual for a long time, and was put into Article 100 because few people use the style manual.

Energized, Likely to Become. (Likely to Become Energized)
Conductive material that could become energized because of the failure of electrical insulation or electrical spacing. (CMP-5)