Class 1 Division 2 ventilation?
Class 1 Division 2 ventilation?
(OP)
NFPA 820, Table 4.2 indicates that a Residential Wastewater Pumping Station Wetwell is a Cass 1, Division 2 Location. If I specify Class 1, Division 2 rated submersible pumps, do I have to ventilate the wetwell or do I have to use a Combustable Gas Detector(CGD? If a CGD is used, does it have to be wired to the pump starters to cancel pump start if gas is detected?





RE: Class 1 Division 2 ventilation?
So, focus more on things like switches and brushes. Those are the things that need to be XP rated, or kept entirely out of the hazardous area.
In general, no, there's nothing to prohibit you from running the motor when an explosive gas is present in a ClI D2 area.
RE: Class 1 Division 2 ventilation?
I search for stuff like that on UL's website. Go to the main page, then pick certifications. You will have to do some research to find the UL category for the pump (the UL CCN). After you uncover that, you can search by the category to find a list of all approved manufacturers around the globe.
Best of Luck.
NEMA6P
RE: Class 1 Division 2 ventilation?
The tricky thing is making sure the level controls are properly rated. You need to either use Intrinsically Safe Relays (search that term) or Cl1D2 rated devices.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Class 1 Division 2 ventilation?
If it's a classified area, you must use rated equipment. This is probably to cover those occasions, even if infrequent, where the pump may be exposed.
Have a look at UL standard 1207 "Sewage pumps used in hazardous (classified) locations" for more info.
Safety First!
RE: Class 1 Division 2 ventilation?
Not true. From NEC 501.8(B):
". . . the installation of open or nonexplosionproof enclosed motors . . . without brushes, switching mechanisms, or similar arc-producing devices that are not identified for use in a Class I, Division 2 location, shall be permitted."
In Cl I Div 2 areas, your main concern is spark producing devices.
RE: Class 1 Division 2 ventilation?
Wm
RE: Class 1 Division 2 ventilation?
One thing that this brings up: Certain electronic devices may be labeled "non-incendive" for use in Div 2 areas, but I've never run across a motor or enclosure that is labeled or listed for Div 2. The code specifies that in a Div 2 area, if you don't have surface temperature issues or arcing/sparking devices, a "general purpose" enclosure is all that is required. Otherwise, enclosures must be rated for Div 1. Can anybody point me at a motor listed for Div 2 that isn't also listed for Div 1? I'd like to have that in my bag of tricks if it exists...
On the thermal cutout issue, that is a valid point if the motor is small. For small motors, impedance protection is better in this case.
Of course, your starter and stuff must be explosionproof unless it can be located outside the hazardous area.
Holla back!
Best to ya,
Old Dave
RE: Class 1 Division 2 ventilation?
Check UL's online certification directory at http://dat
RE: Class 1 Division 2 ventilation?
This is why I come to this forum. I had no idea UL was doing that.
Best to all,
Old Dave
RE: Class 1 Division 2 ventilation?
RE: Class 1 Division 2 ventilation?
Wm
RE: Class 1 Division 2 ventilation?
Wm