1. NONINCENDIVE INSTALLATIONS FOR CLASS I DIV 2 AREAS

2. NONINCENDIVE OPTIONS
Nonincendive Component
Nonincendive Equipment
Nonincendive Circuit
Nonincendive Field Wiring

3. Nonincendive Component
A component having contacts for making or breaking an incendive circuit and the contacting mechanism is constructed so that the component is incapable of igniting the specified flammable gas–air or vapor–air mixture.
The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion.

4. Nonincendive Component
Unaware of any use in the process industries
Possible application water heater protection in residences

5. Nonincendive Equipment
Equipment having electrical/ electronic circuitry that is incapable, under normal operating conditions, of causing ignition of a specified flammable gas–air, vapor–air, or dust–air mixture due to arcing or thermal means.

6. Nonincendive Equipment Advantages
Maintenance while the instrument is live
Enclosure could be simpler for the vendor
“T” ratings not applicable
Sealing of the wires could not be as strict

7. Nonincendive Circuit
A circuit, other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment, is not capable, under specified test conditions, of igniting the flammable gas–air, vapor–air, or dust–air mixture

8. Nonincendive Circuit
A circuit, other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment, is not capable, under specified test conditions, of igniting the flammable gas–air, vapor–air, or dust–air mixture
Seems to be a less capable version of nonincendive equipment in that only part of a device might be nonincendive

9. Nonincendive Field Wiring
Wiring that enters or leaves an equipment enclosure and, under normal operating conditions of the equipment, is not capable, due to arcing or thermal effects, of igniting the flammable gas–air, vapor– air, or dust–air mixture.
Normal operation includes opening, shorting, or grounding the field wiring.

10. Nonincendive Field Wiring Methods
Nonincendive field wiring may use unclassified locations wiring methods
Nonincendive field wiring systems shall be installed in according to the related control drawing
Simple apparatus, not shown on the control drawing, may be use in a nonincendive field wiring circuit
The simple apparatus cannot interconnect a nonincendive field wiring circuit to another circuit

11. Nonincendive Field Wiring Methods
Nonincendive field wiring shall be installed according to with one of the following:
In separate cables
In multiconductor cables where the conductors of each circuit are within a grounded metal shield
In multiconductor cables or in raceways where the conductors have insulation with a 0.25 mm minimum thickness

12. CONTROL DRAWING

13. CONTROL DRAWING Entity Concept often used
Nonincendive Field Wiring Apparatus connects nonincendive field wiring
Validation of the design is required using quantitate methods

14. ENTITY CONCEPT Nonincendive Field Wiring is Intrinsically Safe “Light”
Nonincendive Field Wiring Apparatus is like a IS Barrier
Engineering calculations are similar to an IS installation
The segregation is less so its cost is less than IS
Lower burden during maintenance and looser wiring practices allowed that ordinary Div 2 practices

15. Class I Div 2 Wiring Methods

16. NONINCENDIVE MARKET
Few devices marketed strictly for nonincendive field wiring services
Nonincendive field wiring practices using IS components not explicitly allowed by the NEC

17. NEC (B) (2) (a)
Intrinsically safe apparatus having a control drawing requiring the installation of associated apparatus for a Division 1 installation shall be permitted to be installed in a Division 2 location if the same associated apparatus is used for the Division 2 installation

18. Nonincendive Field Wiring Apparatus

19. Nonincendive Field Wiring Apparatus

20. Nonincendive Field Wiring Apparatus

21. Nonincendive Field Wiring Apparatus

22. REFERENCES
API 14F Electrical Systems for Offshore Petroleum Facilities
API 540 Electrical Installations
ISA Equipment in Hazardous Locations 2013
ISA Non-Incendive 2015
ISA TR Electrical Equipment in a Class I, Division 2 & Zone 2 Hazardous Locations
NFPA 70 National Electrical Code 2014
NFPA 70 National Electrical Code 2017

23. DISCUSSION