The Series or Parallel structure of pressurized enclosure.

C

Ceeera

Member
Location
US
Occupation
Enginner
I saw the this structure in NFPA 496, but I've not found in IEC 60079-2.

Have you heard the parallel pressurized enclosure? there only mentioned about multiple enclosure.
 
OK, I will be the first to admit that I have no idea what you are talking about. How does the stuff you named relate to electrical installations or to the National Electrical Code?
 
Is the series or parallel meaning the way the panel receives its supply air via its own tubing (parallel). Or purged through already purged panel via connections pipe nipples? (Series)

Complete wild guess here.
 
Ceeera said:
I saw the this structure in NFPA 496, but I've not found in IEC 60079-2.

Have you heard the parallel pressurized enclosure? there only mentioned about multiple enclosure.
Click to expand...
The word "parallel" does not appear in the 2024 NFPA 496. Are you asking about more than one pressure supply to a single enclosure?
 
Thank you all for your replies!. My question is: if a pressurized equipment consists of multiple enclosures connected in parallel to a single protective gas supply line, is it necessary to install safety functions (e.g., alarm, flowmeter, etc.) on each enclosure?
What if the enclosures are connected in series to the same supply line instead?
 
Yes, each enclosure must monitor its purge system. There are failure modes that could result in any one (and only one) enclosure losing its purge.
 
Ceeera said:
Thank you all for your replies!. My question is: if a pressurized equipment consists of multiple enclosures connected in parallel to a single protective gas supply line, is it necessary to install safety functions (e.g., alarm, flowmeter, etc.) on each enclosure?
What if the enclosures are connected in series to the same supply line instead?
Click to expand...
If you have a supply line to each enclosure, each enclosure must be monitored. If you connect them in series, only the last is monitored.
5.2.6 ... Where internal compartments or adjacent enclosures are connected in series, the pressure or flow sensor shall be located at the downstream end of the series of compartments or enclosures.
Click to expand...
 
Ceeera said:
Thank you for the help!



Can I use this way if I get by UL 60079-2?
Click to expand...
I have no idea of what UL 60079-2 says as it is not available on UL's free viewing platform. In general, the NFPA standards and UL standards do not contradict each other.
 
You must log in or register to reply here.
Top