CSA/AM - ANSI LC 1/CSA 6.26
Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST)
|Publication Date:||1 January 2011|
This standard does not apply to CSST, whether coated or uncoated, intended for direct burial underground. Tubing shall be installed underground only when encased inside either an approved conduit or as part of an approved engineered system and in accordance with local codes and the manufacturer's instructions.