OVERVIEW OF CABLES PERMITTED IN HAZARDOUS LOCATIONS
Selection of Cable and Cable Connectors for Hazardous Locations.
The NEC & CEC codes require that any cable for use in a Hazardous Location must firstly be permitted in the Explosive Atmospheres, and secondly be tested and approved for the application.
| Hazardous Location / Cable Type | Class I Division 1 | Class I Division 2 |
|---|---|---|
| NON-ARMORED TRAY CABLE | NOT PERMITTED | PERMITTED |
| POWER LIMITED TRAY CABLE WITH SERVED WIRE ARMOR | NOT PERMITTED | PERMITTED |
| IEEE 45 MARINE SHIPBOARD CABLE | PERMITTED (OFFSHORE INSTALLATIONS) | PERMITTED (OFFSHORE INSTALLATIONS) |
| MC-HL, ITC-HL | PERMITTED | PERMITTED |
| INTERLOCKED MC ARMOR & TECK | NOT PERMITTED (USA) PERMITTED (CANADA) | PERMITTED |
| Hazardous Location / Cable Type | Class I Zone 1 | Class I Zone 2 |
|---|---|---|
| NON-ARMORED TRAY CABLE | NOT PERMITTED | PERMITTED |
| POWER LIMITED TRAY CABLE WITH SERVED WIRE ARMOR |
NOT PERMITTED | PERMITTED |
| IEEE 45 MARINE SHIPBOARD CABLE | PERMITTED (OFFSHORE INSTALLATIONS) | PERMITTED (OFFSHORE INSTALLATIONS) |
| MC-HL, ITC-HL | PERMITTED | PERMITTED |
| INTERLOCKED MC ARMOR & TECK | NOT PERMITTED (USA) PERMITTED (CANADA) | PERMITTED |
| CABLE CONNECTOR TYPE / APPROVED CABLE TYPE | IEC (ZONE 1) | NEC CLASS / DIVISIONS | CEC CLASS / DIVISIONS | NEC CLASS / ZONES | CEC CLASS / ZONES |
|---|---|---|---|---|---|
| A2F (Non-Sealing Type for Non-Armored cables) | Ex d IIC & Ex e II | NOT PERMITTED (*) | NOT PERMITTED | Class I Zone 1 AEx e | Class I Zone 1 Ex d |
| Triton CDS (Non-Sealing Type for Braid & SWA Armored Cables) | Ex d IIC & Ex e II | NOT PERMITTED (*) | Class I Division 2, ABCD (#) | Class I Zone 1 AEx e | Class I Zone 1 Ex d |
| PX2K (Seal Type for Braid & SWA Armored Cables) | Ex d IIC & Ex e II | Class I Division 1 | Class I Division 1, ABCD | Class I Zone 1 AEx d | Class I Zone 1 Ex d |
| PXSS2K (Seal Type for Non-Armored Cables) | Ex d IIC & Ex e II | Class I Division 2 | Class I Division 2, ABCD | Class I Zone 2 AEx d | Class I Zone 2 Ex d |
| PXSS2K (Seal Type for Extra-Hard Usage Cord) | Ex d IIC & Ex e II | Class I Division 2, ABCD | Class I Division 2, ABCD | Class I Zone 1 AEx d | Class I Zone 1 Ex d |
Notes : (*) Under NEC wiring rules these products may be used in Division 2 in conjunction with terminal enclosures which do not incorporate arcing or sparking devices, i.e. when there is no internal source of ignition in the enclosure. (#) Under CEC wiring rules these products should not be interfaced with an explosion proof enclosure containing arcing and sparking devices, unless installed in conjunction with an approved explosion proof sealing fitting. |
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For any Explosion proof equipment installed in Class I Division 1 & Division 2 Hazardous Locations, or AEx d equipment installed in Class I Zone 1 or Class I Zone 2 Explosive Atmospheres, a compound barrier type (seal type) cable gland must always be used under the NEC - CEC wiring code rules.
Typical Class I Division 1 & Division 2 Sealing Methods
MC-HL Cable or other cable suitable for Class I Division 1 Hazardous Locations
Typical Class I Zone 1 & Zone 2 Sealing Methods
MC-HL Cable or other cable suitable for Class I Zone 1 Hazardous Locations
Note : (†) This condition is permitted provided the cable is not attached in the hazardous location to process equipment or devices that may cause a pressure in excess of 6 inches of water (1493 Pascals) to be exerted at a cable end. This applies when cables transit from Division 2 to Division 1, Non Hazardous and Zone 2 to Zone 1 and Zone 2 to Non Hazardous areas.
Typical Class I Zone 1 & Zone 2 Sealing Methods
MC-HL Cable or other cable suitable for Class I Zone 1 Hazardous Locations
Typical Class I Zone 1 & Zone 2 Sealing Methods
MC-HL Cable or other cable suitable for Class I Zone 1 Hazardous Locations
Note : (†) This condition is permitted provided the cable is not attached in the hazardous location to process equipment or devices that may cause a pressure in excess of 6 inches of water (1493 Pascals) to be exerted at a cable end. This applies when cables transit from Division 2 to Division 1, Non Hazardous and Zone 2 to Zone 1 and Zone 2 to Non Hazardous areas.
Typical Class I Division 1 & Division 2 Sealing Methods
MC-HL Cable or other cable suitable for Class I Division 1 Hazardous Locations
Note : (†) This condition is permitted provided the cable is not attached in the hazardous location to process equipment or devices that may cause a pressure in excess of 6 inches of water (1493 Pascals) to be exerted at a cable end. This applies when cables transit from Division 2 to Division 1, Non Hazardous and Zone 2 to Zone 1 and Zone 2 to Non Hazardous areas.
