HAZLOC Standards

Hazardous locations standards in the USA are developed by one of a number of standards development organisations accredited by ANSI, such as UL, FM, and NFPA.

A selection of US standards are presented below, alongside the IEC standard covering the same material.

USA standards

Type of protection Symbol IEC Standard USA
General requirements IEC 60079-0 UL 60079-0
ISA 60079-0
FM 3600
Flameproof enclosures d IEC 60079-1 UL 60079-1
ISA 60079-1
FM 3615
UL 1203
Pressurized enclosures p IEC 60079-2 FM 3620
ISA 60079-2
Powder filling q IEC 60079-5 UL 60079-5
ISA 60079-5
Oil immersion o IEC 60079-6 UL 60079-6
ISA 60079-6
Increased safety e IEC 60079-7 UL 60079-7
ISA 60079-7
Intrinsic safety i IEC 60079-11 FM 3610
ISA 60079-11
UL 913
UL 60079-11
Type of protection 'n' n IEC 60079-15 FM 3611
ISA 60079-15
ISA 12.12.01
UL 60079-15
UL 1604
Encapsulation m IEC 60079-18 UL 60079-18
ISA 60079-18
Intrinsic safety i IEC 60079-11 FM 3610
ISA 60079-11
ISA 61241-11
Encapsulation m IEC 60079-18 ISA 60079-18
ISA 61241-18
Protection by enclosure t
tD
DIP
IEC 60079-31 FM 3616
ISA 60079-31
ISA 61241-1
UL 1203
Pressurization pD IEC 61241-4 FM 3620
ISA 61241-2
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