Seals..

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tshephard

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Can a single seal provide both the enclosure/apparatus seal and the boundary seal if it is with 18 inches of the apparatus and also within 10 feet of the boundary, and other rules followed (continuous rigid, listed reducers, etc...) or is one required to satisfy each section?
 
I don't see any reason why you can't use a single seal for both the enclosure and boundary seals as long as you comply with the rules for both.
 
tshephard said:
Can a single seal provide both the enclosure/apparatus seal and the boundary seal if it is with 18 inches of the apparatus and also within 10 feet of the boundary, and other rules followed (continuous rigid, listed reducers, etc...) or is one required to satisfy each section?
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Not sure of your particular circumstances, but look at 501.15(A)(3)..or (B)(1)..:)
 
'Through... ingenuity...' I have ended up with equipment 32 inches from a boundary.
A single seal seems to meet the needs of 2 code sections, I just wondered if they would be considered exclusive - boundary seal only for boundary clause, apparatus seal only for apparatus.
Logic and common sense did not seem to exclude a single seal, I am just checking the semantics and my logic with those who are more familiar and experienced.

Thanks!
 
Maybe

Maybe

There is no code language to support an answer but the code does allow one seal to serve for two enclosures that are within 36 inches of each other.

It should also be noted that boundry seals can be up to 10 feet off the boundry only when there is no fittings (no threaded connections that can vapors can migrate into) except for one reducer bushing. Your example must also meet this requirement.

While i would accept this if i were your inspector, i would not want to risk getting red tagged because your inspector does'nt agree.
 
we have a large room that is in a x proof building , idon,t know if it is c1 div 1 or c1 div2. there is a sump pump 10' below the first floor, it is a sewer , would this be c1 div1? What type of motor [120v] and float would i beable to install? and would i need a seal coming up through the floor? any input or help thank you.
 
puckman said:
we have a large room that is in a x proof building , idon,t know if it is c1 div 1 or c1 div2. there is a sump pump 10' below the first floor, it is a sewer , would this be c1 div1? What type of motor [120v] and float would i beable to install? and would i need a seal coming up through the floor? any input or help thank you.
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i believe sewers are cl1 div1. methane.

the floats that i have installed are the floating buoy type with
mercury switches inside. they were listed cl1 div1, and the levels
are set by the amount of free line you have, and the anchor point of
the line. the application was a bar screen room in a sewage treatment
plant. you can get them with up to 4 sets of contacts, from what i've
seen.

pump for raw sewage? there's all sorts of specialty equipment for this
type of service, including muffin munchers... (don't ask)...... :-(

as for seals, if you aren't leaving a classified area for a different level of
classification, i'd say no, as both the floats and pump should be
intrinsically safe. me, i'd put them in, anyway. you don't have to pour
them if they aren't needed, and you won't have to repipe them if they
are needed. and the price of two eys's is not worth having to revisit the
area, IMHO.

as for installing float levels in sewage sumps, my personal experience
is to do it before breakfast. being in a bar screen room with a full
stomach will be promptly corrected. on a positive note, when you do
hurl, it just goes down thru the grating, and into the inflow.... nothing
to clean up......:smile:

a bit of trivia about bar screen rooms.... the bar screen picks up much
the drug money flushed down the drains, and they keep a washing machine
on the premises for laundering the money. it's tan, but it spends.
 
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