Sewage pumping station

[patc]

Can anyone tell me if stainless floats utilizing integral rubber cords are acceptable to be used in municipal sewage pumping wells. The voltage being applied is 120v. Some are terminated at terminal strips outside the well on intrinsically safe barriers others do not use the barrier. There is no listing on the float that would indicate that they are acceptable to be used in this environment. NFPA 820 lists this area as class 1 division 2.and approves extra hard usage cord, which these are, for this type of classification when flexibility is needed for the removal of equipment. Thank you

[ December 29, 2003, 01:49 PM: Message edited by: patc ]

 

[rick5280]

Re: Sewage pumping station

You will need to find out if the float is approved or not, by the manufacturer. If no marking, or if you can't find it, I would say that it is not approved for a classifed location, and can not be used.

Some cords do allow gases to wick up the outer covering, and could cause some problem.

Find out what type it is.

Rick Miell

 

[don_resqcapt19]

Re: Sewage pumping station

Is the switch in the float a mercury switch? If so 501.6(B)(1)(1) would permit its use in a Class 1 Division 1 area without a specific listing for use in classified areas.
Don
The post above should read Class 1 Division 2.
thanks, Rick!

[ December 29, 2003, 06:50 PM: Message edited by: don_resqcapt19 ]

 

[rick5280]

Re: Sewage pumping station

Good call Don. I pretty sure you meant in a Class1, Div 2 location, but the point is well taken.

I hadn't thought of the switching part of the float as being in a hermetically sealed chamber, but it would have to be.

My thought about this was the other end of the cable, and allowing gas to enter into the cord insides, and wick up to the junction box or other enclosure, where switching (arcing etc) could happen. You could not effectivaly seal off the cord, unless it was the type approved for such.

Rick Miell