EGA & Corrosive/Wet Locations - Sections 20 & 22 Flashcards
If retrofitting an old installation under the Class and division system, where would someone find rules pertaining to the zoning of explosive gas atmospheres?
Annex J20.
If a conduit is buried anywhere under a zone classified area of a gas station, is it considered hazardous?
Yes, it is in a zone 1 area.
If a gas tank vent pipe has a mushroom cap, how is the zoning around it developed?
A spherical radius of 900 mm from the outlet will be zone 1;
Beyond that, up until 1.5 m radius will be zone 2;
All cylindrical area beneath above zoning will be zone 2.
Is the floor of an aircraft hangar considered hazardous?
Yes, up until 450mm above grade.
In general, are pits hazardous?
Yes, vapor usually pools there.
In a commercial repair garage, how far above grade would an adjacent office need to be to not be considered hazardous?
50 mm.
Should you light a cigarrette while fueling?
Probably not.
What does “category 1” mean?
A wet location.
Where will one find non-hazardous enclosures in the CEC?
Table 65.
If a conductor passes from a cat 1 or 2 location into a dry location, the conductors on the dry side will be __________.
Higher up;
So that the moisture collects in the cat location.
Should aluminum be used when wiring your friend’s barn?
No.
What is considered adequate ventilation for a barn?
3 air changes per hour;
as per the national farm building code of canada.
