insulation of DC batteries structures 2

[odlanor]

Our standard is floating DC batteries.
Bseide this, structures of batteries room are isolated floor through insulators and the system is isolated from ground.
Is it necessary that insulation?

 

[stevenal]

No. Possibly a code violation too. NESC 143 requires metallic battery racks to be grounded.

 

[cranky108]

If they are a utility the NESC may not apply. This is an interesting issue, because corrosion can grow and form a high impedance path between the battery terminals and the rack, and because most substations don't have running water, there is a limit on how much washing can be done, and how to dispose of the wash water.