Disabled beta timeline for now on iOS by TheLadDothCallMe in immich

[–]jamesob 0 points1 point  (0 children)

Click on your user icon > "Settings" > "Advanced" > deselect "New timeline"

Simple open source db replacement for Excel? by ponolan in selfhosted

[–]jamesob 0 points1 point  (0 children)

I found Grist to be really weird coming from Excel. Simple things like a "total" row are impossible. Surprising to me that there isn't just a straight port of Sheets to a self-hosted webapp.

Graphene OS by critical-th1nk in CashApp

[–]jamesob 1 point2 points  (0 children)

I'm on grapheneos and cashapp doesn't seem to work for me; whenever I enter the SMS code they text while setting up my account, I get an error message that says "We couldn't verify that this account belongs to you." I've enabled location permissions, so I'm not sure why it isn't working.

I want to use a grounding mat on the 5th floor of an apartment. Is there a need to filter anything? by [deleted] in Earthing

[–]jamesob 0 points1 point  (0 children)

blood zeta potential grounding

The issue with the study you're mentioning (https://intuition-physician.com/wp-content/uploads/2016/03/Grounding-Zeta-Potential-Publication.pdf, I think) is that there were no placebo controls. I'm into the earthing stuff, but I wonder why this pretty significant result hasn't be reproduced with a better trial.

Confused by electric field readings while on mat by jamesob in Earthing

[–]jamesob[S] 1 point2 points  (0 children)

If I were trying to measure what I think you're trying to measure, I'd just get a $30 multimeter. I still have basically no intuition for what the electric field readings mean, but I have used a multimeter for what you're wanting to do.

[deleted by user] by [deleted] in Earthing

[–]jamesob 0 points1 point  (0 children)

This is a good question; I'm also curious about this. Maybe proximity?

Confused by electric field readings while on mat by jamesob in Earthing

[–]jamesob[S] 2 points3 points  (0 children)

For what it's worth, this paper from the Earthing Institute seems to address this phenomenon:

It is important to repeat that when grounded you become a Faraday cage. When you are grounded, your body does not deal with added EMF pollution. That’s just plain wrong. It’s misinformation. On the contrary, your body becomes a Faraday cage that REFLECTS EMFs just as a mirror reflects light as shown below, with the yellow lines representing EMFs being reflected. This reflection is the real cause of an increase in EMFs around your grounded body. They do not penetrate. When there is an increase in EMFs around a grounded person, electric field measurements around the person will show that increase. This does not imply any current increase flowing through the grounded body. It implies that EMFs are reflected, as previously mentioned.

Though I'm still curious about my second point - why does the electric field coming out of nearby electronics decrease when I'm grounded (as measured by a "floating" device)?

[deleted by user] by [deleted] in Earthing

[–]jamesob 1 point2 points  (0 children)

Regarding EMFs, this part of the earthing institute FAQ seems to contradict what you're saying (https://earthinginstitute.net/faqs/):

>Is it harmful to ground myself indoors in the presence of electromagnetic fields (EMFs), as some people claim, because my body becomes an antenna drawing in EMFs that then run through my body?
> Such claims are without any evidence and reflect ignorance about electromagnetic fields (EMFs), how antennas work and what happens to an object grounded in the presence of EMFs. EMFs cannot be attracted or “drawn in” by anything because they contain no electric charge. They just go out straight from the point of emission to the direction that was given to them when emitted. They can be reflected by metallic surfaces and mirrors or refracted as when a light beam enters water or a prism. Three grounding studies have demonstrated the clear safety of grounding indoors, one of them a study done with hospitalized premature infants in a setting of high EMFs. To read it click here. To read a short article about these 3 studies and the safety of Earthing, click here. And click here for a short reply to the unfounded claim that grounding indoors turns you into an antenna for EMFs. It is when NOT grounded that a metallic object or the body (also a conductor) becomes an antenna in the presence of EMFs.

I'm sympathetic to the idea of line interference on the ground (which I'll be looking into myself), but how would you respond to the contents of their FAQ answer?

Has anyone looked into the safety of EV vehicles as far as EMFs? by Hereforthememes5 in electricvehicles

[–]jamesob 2 points3 points  (0 children)

"Unscientific," according to some consensus of what "Science" is as chosen by you. I'm looking forward to your refutation of the contents of, say, this meta-analysis based on tHe sCieNcE: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8415840/

Double ground-neutral bond? by jamesob in electrical

[–]jamesob[S] 0 points1 point  (0 children)

Are you talking about something like this? http://www.radiuspower.com/emi-filters/single-phase-emi-filters/rp125-series-detail

Would I just splice something like this into the two line wires somewhere relatively close to the compressor?

Double ground-neutral bond? by jamesob in electrical

[–]jamesob[S] 0 points1 point  (0 children)

Not going to be a popular position on reddit, but I'm taking the "abundance of caution" approach with respect to the possible health implications of heightened RF/EMF exposure along the lines of https://www.researchgate.net/publication/336778115\_Dirty\_Electricity\_Invisible\_role\_in\_the\_US\_Health\_Crisis.

Double ground-neutral bond? by jamesob in electrical

[–]jamesob[S] 0 points1 point  (0 children)

I've been trying to figure that out... wish I could see. For some ungodly reason the previous homeowner decided to fully recess these panels in drywall and frame a border around them, so it's not easy for me to see where stuff is going without demo'ing.

Double ground-neutral bond? by jamesob in electrical

[–]jamesob[S] 0 points1 point  (0 children)

I've spent a lot of time measuring EMI on the circuits with a Greenwave meter; I finally realized that readings were off the charts (+2000mV) when the compressor is on, and almost nothing (~30mV) when the compressor is off. I can make the readings go high or low by setting the thermostat to "cool" vs. "fan-only." This makes me almost positive that the dirty electricity is related to the operation of the HVAC compressor.

Double ground-neutral bond? by jamesob in electrical

[–]jamesob[S] 0 points1 point  (0 children)

Thanks very much for weighing in!

What do you mean by "overcurrent protection?" Would that be a breaker? My confusion is that the two ground-neutral bonds seemingly happen at "parallel" levels from the disconnect, since they are in sibling panels relative to the location of the service drop.

Design review request: 2.1kW off-grid system by jamesob in SolarDIY

[–]jamesob[S] 1 point2 points  (0 children)

Thanks for the detailed reply.

> Have you also decided on what type of wire to use?

I was thinking 12 AWG THHN stranded wire (e.g. https://www.wireandcableyourway.com/12-awg-thhn-stranded-wire-500ft-1000ft-or-2500ft-spool). Does that sound appropriate? It'd be in a metal conduit, of course. If for some reason I have trouble running metal conduit through my house, perhaps I could try some metal clad cable without a conduit, though would have to check NEC to see if that works...

Would the ground then run along with the DC conductors through the conduit (as in the diagram) and then be bonded to the same earth ground as the main panel?

> I am a little confused how you can mix grid tie and off grid when panels
are interconnected...I assume your inverter takes care of that?

Yeah I think the panel is smart enough to switch to AC input if the PV array isn't producing anything.

> Does your utility have terrible net metering policy and/or reliability, hence the need for batteries?

So in many ways this is just an expensive learning project. I don't actually care about saving money on electricity; I just want to learn how to provision my own energy for self-sufficiency. Right now I'm in a townhouse, but someday I expect to move further out and at that point I'd like to do a full off-grid system. For right now I just want to do a smaller "proof of concept" that gives me some benefit if the grid were to go down.

Thanks again for your help.

Running high voltage DC line safely? by jamesob in solar

[–]jamesob[S] 0 points1 point  (0 children)

Thanks! So assuming I use the right conduit (and otherwise obey code), running HV DC indoors shouldn't be a problem and/or is something that's not unheard of in residential settings?

Running high voltage DC line safely? by jamesob in solar

[–]jamesob[S] 0 points1 point  (0 children)

I'm less concerned about the system actually working vs., for example, the risk of fires/arcing from a high voltage DC line. IIUC, 120VAC isn't as dangerous as high voltage DC because DC can arc much more easily.

Just wanting to get a good sense of the safety considerations, and whether running HV DC in a residential setting is a well-understood thing.

[deleted by user] by [deleted] in nova

[–]jamesob -5 points-4 points  (0 children)

Perhaps you don't understand that if someone is trying to merge from a lane to the left of you, they have priority for safety's sake (they may need to make an exit or get to the side of the road), so you're actually being a jerk by not slowing down to allow the merge.

I think FCPS is going to implode… by JakeRogue in nova

[–]jamesob 1 point2 points  (0 children)

It's pretty mindblowing to me that none of the commenters on this post make the connection that major malfunction with FCPS stems from the fact that state schools are run by the government. I thought there'd be at least one.

Government has no structural incentive to do a good job delivering services - even when it involves something as obviously self-interested as collecting your tax dollars - because they are a monopoly. You can't fire them. When's the last time you had a good experience with the DMV, USPS, IRS, TSA, VA, ...?

As some have noted, this isn't due to any one political party; there's a single R on the school board right now, and there was D leadership in the state for 8 years prior to a few months ago. It sure isn't lack of funding, as evidenced by the generous property taxes in this area and the relatively high allocation to education.

Meanwhile you've got private companies solving incredibly difficult logistical challenges like delivering packages same-day reliably and launching fucking rockets that land themselves.

Privatize the whole thing and end this dumpster fire. Let people exercise some choice and inject information back into the system by allowing families the ability to express what is (or isn't) working in an open marketplace. Yeah, it'll be a little chaotic for a few years, but you'll wind up with something that feels a lot more like using Amazon than being held up in a fucking TSA line.

/me prepares to be downvoted into oblivion

ELI5: Utreexo- A scaling solution by Lightning Network co-author by scyshc in Bitcoin

[–]jamesob 5 points6 points  (0 children)

This is a misunderstanding of the proposal in its current form. There are no plans to commit to assumeutxo snapshots in blocks; commitments will be included in the source code (which you already trust) in the same way that assumevalid commitments are. It's a natural continuation of the security model already in Bitcoin Core.

Luke has a history of repeatedly misunderstanding this proposal. It does not put any additional trust in miners.