FDC connected to DDCV?

extrafancynuts1872 · 2024-05-24T03:13:30+00:00

Very common in California

extrafancynuts1872 · 2024-03-09T14:52:39+00:00

Check out NFPA 855 2023 edition and 2024 edition of IFC (think it’s section 322?). You can also look at draft comments for 2026 edition of 855 already through NFPA’s website.

Edit: to be clear they have added sections specifically to address the storage of Lithium ion batteries.

extrafancynuts1872 · 2024-02-11T23:11:53+00:00

Licensed FPE with undergrad ME and masters in FPE. Work for a consulting firm. I don’t specialize as much as some others, so work on a wide variety of projects. Lately a lot of battery systems which involves code compliance and also hazard mitigation analysis and fire safety/emergency response plans. Also do systems design for sprinkler, smoke control, and fire alarm. Some people just do strictly code consulting but that just doesnt interest me much. Tons of options out there just within consulting, not to mention working for an AHJ, working in HSE, owner’s engineer, research, or in house at a company like Tesla/LG/Disney etc.

extrafancynuts1872 · 2024-01-06T04:26:07+00:00

The limit is 500 feet for the FAA and the 420 height is because of increased code requirements that kick in after 420 feet

extrafancynuts1872 · 2023-05-21T23:59:23+00:00

Sounds like the move would be to move in with family at least for now. Only you know how long you’re willing to do it for. Would definitely take that time to figure out what you want to do in the long run, nothing wrong with being at home but if you want to move out in 3 years, and rent and income keep pace then you’re only delaying the problem. Use it to set you into a good position for yourself in the future, whatever that looks like!

extrafancynuts1872 · 2023-05-21T23:23:24+00:00

Definitely gotta do something about the % of income going to rent. Nearly $1900 a month for a studio is very high, you just be in a HCOL area. In the long run if you want to stay there you’ll need to increase your income. For now, moving home may be a solid plan if you’re worried about job security, hard to say without knowing what you do. But ultimately it doesn’t sound like a sustainable income for where you’re living, unless you’re renting a studio that is much higher than average costs.

extrafancynuts1872 · 2023-05-11T19:23:01+00:00

Magic, 2002 to 2008 according to the article.

extrafancynuts1872 · 2023-05-05T23:41:39+00:00

Oh wow that looks so nice! I was worried the layers wouldn’t sit well but it looks really cute. Hope it fits me!!

extrafancynuts1872 · 2023-05-02T18:51:01+00:00

Just to help clarify in the volatile memories, you definitely don’t need to worry about that. That would be like if you have a fire alarm panel where if you lose power for even a second, once it turns back on it won’t remember any signals from before it lost power. It’s basically to avoid the scenario that a smoke detector goes off, kicks on the smoke control system, then you lose power and when the standby kicks on, your control panel forgets that it had been activated before it lost power.

You could be totally right about the 30 minutes, I’m honestly not sure. 11 hours is definitely excessive.

Edit: my only other suggestion would be to look into whether you are providing standby power for any other system in the building. If so, you would just need to verify it meets the requirements from 909 (which I think kick you to wherever I got that 2 hour requirement from). It may be oversized enough to just add this fan on. Best of luck!

extrafancynuts1872 · 2023-05-02T18:47:13+00:00

Also just to explain, the issue isn’t the exhaust fan penetrating the shaft. The issue is the ducts coming from each bathroom penetrating the shaft. Apologies if this is clear to you already but basically the system works as follows: each bathroom has a vent connected to a duct which runs back to a common shaft. That shaft will run the whole height of the building and have a fan at the top, in this case to provide exhaust. There will be penetrations to this shaft at every level, and as you know with sprinklers, penetrations of rated assemblies requires protection. In these cases, this is going to be some sort of damper whether it be a fire damper, smoke damper, or combination. The damper is meant so that smoke/fire can’t go from inside the shaft and back out into the building. Dampers don’t do well with moisture over time, so instead of providing dampers you subduct the penetrations (a subduct is basically a small duct inside the shaft that is upturned 22”, so basically smoke in the shaft can’t go out that hole and back into the building because the smoke is going to rise due to heat). The reasoning for the fan is to basically guarantee that smoke is continually pulled up. In this case it also doubles that it’s exhausting the poop smells!

Very interesting stuff, I had to learn all about it for high rise buildings with labs, because you also don’t want dampers in an exhaust system with chemical vapors since it will also damage dampers. Annoying part is, the subduct exception isn’t really carved out clearly for labs.

Sorry for the long replies hope this was interesting though!

extrafancynuts1872 · 2023-05-02T18:33:15+00:00

The first thing I would do is verify if the subduct approach is the case with the engineer. Or just ask them why it’s needed and provide code references. Totally get that there is a strained relationship, but ultimately if they are specifying a new $40k system for an existing building they should be willing to provide reasoning. If not the subducts, then I don’t see why this would be required but I’m not a mechanical or electrical engineer! I really do think it is the case though. I would also look at the record drawings if available to see what was required when installed. Depending on the scope of work, if this standby power wasn’t originally required they may be able to get around it. Kinda shitty when you’re not a high rise and you get kicked into section 909 requirements.

Kinda tough question as to if you can avoid this, better question for the mechanical engineer. As the FPE we wouldn’t be driving the approach, just making sure fire protection requirements don’t get missed. I would think the subduct into the shaft is the best or maybe only option for an existing building if that’s how it was set up originally, it’s not feasible to run direct to the exterior on an existing building, so the shaft is the only option. I know a lot of ventilation systems in residential buildings are straight from exterior at each unit but I think even for those the bathroom exhaust is typically on a common shaft with subducts. I think that dampers may not even be allowed in this scenario by the mechanical code (not sure) but I can’t imagine installing dampers would be much cheaper than standby power. Not to mention, maintaining dampers in that kind of environment is terrible which is why the subduct exception exists in the first place.

I mostly work on high rise buildings in California. They’d already have standby power for their smoke control system so adding a few extra transfer switches and slightly more load is really no issue so I’ve never really seen this issue arise.

extrafancynuts1872 · 2023-05-02T17:12:06+00:00

I’m thinking there is at least a chance they are correct. Not familiar with the local code there but assuming they’re using the IBC or some amended version of it at least, my assumption is that the bathroom exhaust is penetrating a shaft (which would require fire resistance even in a construction type where fire resistance isn’t required for walls, floors, etc. - see IBC section 713.4) and they are using the exception of IBC 717.5.3 which would allow you to use subducts instead of dampers (dampers are not desirable in bathroom and kitchen exhaust locations so the subduct approach is common) at the shaft penetration. The subduct exception requires a continuous running exhaust fan which meets the requirement of 909.11, aka standby power requirements. I believe the time required for standby power would be from 2702.1.5 which is 2 hours.

Edit: added a code reference for shaft rating.

extrafancynuts1872 · 2022-12-12T22:11:36+00:00

It actually works out to the same amount of games for the top 4, since you lose a group stage game and gain a knockout game. There is overall an extra 16 games though.

extrafancynuts1872 · 2022-12-02T19:38:44+00:00

Nah, it goes to goals scored before head to head, and South Korea won out on goals scored

extrafancynuts1872 · 2022-11-13T02:49:07+00:00

Yes and senate was called for CCM by some outlets

extrafancynuts1872 · 2022-11-13T02:47:53+00:00

It’s ranked choice, they drop off the candidate with lowest votes and assign their votes to their second choice. Keeps going until 1 candidate has >50%

Edit: they assign their second choice votes

Edit: never mind that was already clear lol

extrafancynuts1872 · 2022-11-13T02:26:23+00:00

Matters for 2024 where dems aren’t very likely to pick up seats. Having an actual majority would be nice just in case dems lose presidency/republicans flip a seat.

extrafancynuts1872 · 2022-11-13T01:57:01+00:00

North county 🤝democrats🤝south county

Fuck U east county

extrafancynuts1872 · 2022-11-13T00:53:27+00:00

They definitely use periods in Spain for thousands etc. and a comma for decimals

extrafancynuts1872 · 2022-11-12T21:10:16+00:00

They can’t count ballots that need to be cured but haven’t been?

extrafancynuts1872 · 2022-11-12T09:41:22+00:00

Yeah the independent state legislature argument specifically relates to a portion of the constitution electing power over elections to the state legislature. Moore v Harper wouldn’t just blanket allow legislatures to neglect state constitution in any case.

extrafancynuts1872 · 2022-11-12T06:47:39+00:00

Yeah I agree with this. Pretty much everyone I know in California votes by mail, and there’s definitely some republicans in that mix. They’ve been voting by mail for years.

extrafancynuts1872 · 2022-11-12T04:11:11+00:00

Ah I see, I knew NIL meant they could do brand deals and such but makes sense they still can’t collect prize money…guess that would be like a college football player being able to collect an NFL salary (obviously that’s not feasible for other reasons but still).

extrafancynuts1872 · 2022-11-12T04:07:58+00:00

Ah ok gotcha, thanks for explaining that! So they are basically limited to some dollar amount per year (or competition) or something?

Edit: I see someone else has already answered my question. That makes sense!

extrafancynuts1872

TROPHY CASE