2-2 / Installation 2808B
The installation of equipment in hazardous areas must comply with the National Electrical
Code ANSI/NFPA-70, and ANSI/ISA S82.01, S82.02, & S82.03 standards. Transmitters
certified for use in hazardous areas will have the mark of the certifying agency inscribed on
the Transmitter data plate.
The checklist that follows emphasizes some key points of safety with regard to installations
in hazardous areas.
1. All Transmitter wiring that passes through hazardous areas must be enclosed in metal
conduit. The point where the conduit connection feeds into the Transmitter’s housing
must be properly secured to prevent entry of gases or other ignitable substances into the
Transmitter. Explosion-proof wiring practices must be followed to prevent flashback
through the conduit.
2. The cover of the Transmitter must be screwed in hand tight and fully seated. The cover
must be replaced if it is damaged or shows stripped threads.
3. The cover of the unit must always be in place and secured when the Transmitter is
powered. The cover must never be loosened or removed unless the atmosphere is made
safe or all electrical power is removed from the Transmitter.
WARNING: Removing the cover of a Transmitter while it is operating in a hazardous area
is dangerous and could result in fire or explosion.
Figure 2-1 - Dressing of Wire Leads
2.3 ELECTRICAL WIRING NOTES
All wiring connections cited in the text and illustrations must conform to the National
Electrical Code, and local authority. Only technically qualified persons should perform
wiring procedures.
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