Hazardgard^® Compliance

All Friedrich Hazardgard air conditioners are designed and tested to obtain the highest compliance ratings:

UL Certifications National Electrical Code, NFPA 70 ARTICLE 501: Class 1, Division 2, Group A / B/ C / D, Temperature Class T4 / T4A* ARTICLE 505: Class 1, Zone 2, Group IIA / IIB / IIC, Temperature Class T4 / T4A*

ATEX/IECEx Certifications ATEX II 3 G Ex nA nC IIC T4 Gc IECEx Ex nA nC IIC T4 Gc KSA registered model in accordance with SASO 2681

Hazardgard Model UL Certifications ATEX/IECEx SASO 2681 SH15M30A X SH20M30B X X SH20M50A X SH24N20 X SH20N50AT X X SH24N20AT X X

Temperature Classification

Electrical equipment, like hazardous location air conditioners, that may be exposed to specific hazardous gases or vapors in the area where it will be used, cannot reach temperatures that exceed 80% of the auto-ignition temperature of those gases or vapors. Hazardgard has a T4 rating which means that its surface temperature should not exceed 135°C or 275°F.
The dual frequency (50/60 Hz) Hazardgard^® models SH24N20 & SH24N20AT have T4A rating which means that the suface temperature should not exceed 120° C or 248° F

Electrical Equipment Label Temperature (C) Temperature (F) T1 450°C 842°F T2 300°C 572°F T2A 280°C 536°F T2B 260°C 500°F T2C 230°C 446°F T2D 251°C 483.8°F T3 200°C 392°F T3A 180°C 356°F T3B 165°C 329°F T3C 160°C 320°F T4 135°C 275°F T4A 120°C 248°F T5 100°C 212°F T6 85°C 185°F

The above chart illustrates that 200°C is the maximum surface temperature for any electrical equipment with a temperature classification of T3 or higher.