NFPA 297: Guide on Principles and Practices for Communications Systems
NFPA 297 通信系统的原理与操作指南
Deals with systems, their components, and operations that involve the transfer of information over a distance utilizing electrical or electronic means.
NFPA 297: Recommended Practice for Fire Fighting Equipment Preventive Measures Fire Signals and Fire Fighting Personnel in Metal Mines. - Editions Prior to 1997
Previously purchased through NFPA®’s Library, all NFPA documents published prior to 1997 are now sold through the NFPA Catalog. Click on the "Editions Prior to 1997" tab on this page, select the edition year of this NFPA document you wish to order and add it to your cart. You will be able to download your document at the end of the checkout process. Related notations are also included on several editions indicating significant changes. All editions are available to order in PDF format only. If you are looking for an edition of this that is 1997 or later, simply do a keyword search on the document number and edition year. Example: “NFPA 13 1999