What shall be minimum thickness of firewall in between two transformers and wh

What shall be minimum thickness of firewall in between two
transformers and which code specifies it ?

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What shall be minimum thickness of firewall in between two transformers and which code specifies i..

Firewalls between transformer (Firewall) shall be provided with 230mm thick RCC or 355mm thick brick wall.

You can refer NFPA 850 for reference.

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