توضیحات :
NFPA 170 – Standard for Fire Safety and Emergency Symbols
۲۰۲۱ Edition
Chapter 1 Administration
۱-۱ Scope. This standard presents symbol s used for fire safety, emergency, and associated hazards .
۱-۲ Purpose. The purpose of this standard is to standardize the symbol s used in representing fire safety, emergency, and associated hazards .
۱-۳ Retroactivity. The provisions of this standard reflect a consensus of what is necessary to provide an acceptable degree of protection from the hazards addressed in this standard at the time the standard was issued.
۱-۳-۱ Unless otherwise specified, the provisions of this standard shall not apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard . Where specified, the provisions of this standard shall be retroactive .
۱-۳-۲ In those cases where the authority having jurisdiction determines that the existing situation presents an un acceptable degree of risk, the authority having jurisdiction shall be permitted to apply retroactively any portions of this standard deemed appropriate.
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