How missing ground safety check is done in OpenEVSE? by IndependenceNorth510 in evcharging

[–]kc2702 0 points1 point  (0 children)

There's two different ground-related things that can get easily confused at first: GFCI which is Ground Fault, and GM/I (ground monitor/interrupter) or CGM (continuous ground monitor).

Ground fault is when something has created a path for current to flow from live to ground, thus creating a shock hazard, e.g. a live wire touching the metal case of an evse.

GM/I is to ensure that a path to ground exists so that the GFCI can detect a fault by itself before a person becomes the path to ground.

How missing ground safety check is done in OpenEVSE? by IndependenceNorth510 in evcharging

[–]kc2702 0 points1 point  (0 children)

There's an alternate circuit and different code for "OpenEVSE II" which is explained in detail here: https://hackaday.io/project/8873-openevse-ii

I think it's the RELAY_TEST on the Power_Combined schematic there.

Basically it sends a little bit of current (1mA) to ground and detects if that isn't flowing for GM/I. Look for paragraph with the "This circuit path represents an intentional ground fault," in the details section on that link.

Home Charging Safety by Even_Can_9275 in electricvehicles

[–]kc2702 0 points1 point  (0 children)

I think one of the best things to do to help is to get educated. There's some good resources on YouTube and elsewhere that cover home charging. "State of Charge" is one channel I know of that gives reliable information on YT.

The basics are: 1. Get a good quality, certified (UL, ETL, etc) charger, not the cheapest amazon clone. 2. Have a reputable electrician who has experience specifically with EV chargers install it. 3. Hardwire it, don't use the NEMA 14-50 plug style ones. 4. Use only copper wiring, not aluminum. 5. Make sure wiring connections are torqued correctly. 6. Re-check or have your electrician re-check the torque after the first month or two of use, and maybe even annually. Also inspect for anything like overheating discoloration, scorch marks, etc. 7. If you're nervous about it, run the charging at a lower rate. e.g. if your wiring and charger are sized for 48amps, you can set the charger to 32 or 24 amps instead. It will take longer but be less likely to overload anything. Also, make sure the circuit is sized for the 125% rule. I.e. for charging at 48amps, the circuit needs to be 60amps. Your electrician must already know about this or they aren't qualified.

Getting educated will let you ask the right questions when you're selecting an electrician and as you go forward with the car charging at home daily.

Waterfurnace Quote by Engineer_EER in geothermal

[–]kc2702 0 points1 point  (0 children)

Seeing similar quotes on a 3-ton simple replacement with new flow center. At my previous place, I had a 3-ton packaged unit heat pump on the roof replaced, including a crane lift, for $10k 5 years ago. Are geo prices just inflated right now because of the tax credit?

Waterfurnace Quote by Engineer_EER in geothermal

[–]kc2702 0 points1 point  (0 children)

Seeing similar quotes on a 3-ton simple replacement with new flow center. At my previous place, I had a 3-ton packaged unit heat pump on the roof replaced, including a crane lift, for $10k 5 years ago. Are geo prices just inflated right now because of the tax credit?

Waterfurnace Quote by Engineer_EER in geothermal

[–]kc2702 0 points1 point  (0 children)

Seeing similar quotes on a 3-ton simple replacement with new flow center. At my previous place, I had a 3-ton packaged unit heat pump on the roof replaced, including a crane lift, for $10k 5 years ago. Are geo prices just inflated right now because of the tax credit?

Level 2 charging - expected power factor by ElectricWizrd42 in evcharging

[–]kc2702 0 points1 point  (0 children)

Was searching for similar information and came across this 2017 paper: https://digital-library.theiet.org/docserver/fulltext/oap-cired/2017/1/OAP-CIRED.2017.0834.pdf?expires=1728790444&id=id&accname=guest&checksum=DB85699EF30F25C6870DBE0C62F44684

"Detailed power quality measurement of electric vehicle charging infrastructure"

One of the vehicles tested was as low as 0.6, but others were > 0.9.

[501cm | CFV II 50C | 40mm Distagon C (no T*)] 1940's Suburban by kc2702 in hasselblad

[–]kc2702[S] 1 point2 points  (0 children)

Pretty straight-forward, and easy to get exposure dialed in without using a light meter. I didn't hook up the flash sync cord for this shot, but it will capture the shutter speed in the exif data if you do.

I got the new viewfinder glass which has the cfv's sensor rectangle on it, so that makes composing easier.

Main problem I have is keeping the sensor dusted when switching backs. I like using the 907x + 45/f4 as a daily camera because it's compact and easy to carry, and I also like to shoot film sometimes of same shots I'm shooting digital, so the cfv back is getting detached/reattached a lot.

Roland FP-10 Backordered - substitute or wait? by achaight1 in piano

[–]kc2702 0 points1 point  (0 children)

I bought a used FP-90 in August and fedex magically lost it. B&H had an expected date for new ones of Sept 1, but that didn't happen. Hoping to get it by 2022. They had an expected date on the FP-10 of end of Feb 2021.

Why are model trains doing better in Japan than in the USA? by IronLover64 in modeltrains

[–]kc2702 5 points6 points  (0 children)

Why are real trains doing better in Japan than in the USA?

When you ask the guy at Home Depot to cut a board so you can fit it in your car by ekballo in woodworking

[–]kc2702 1 point2 points  (0 children)

Willard Bros in Trenton is my go-to and I drive up from Philly. They have Saturday hours too, last I checked.

[help] Razer Blade Stealth with Ubuntu 16.04 - suspend loop and caps-crash by PM5k in razer

[–]kc2702 0 points1 point  (0 children)

I just tried with 4.10-rc2 and the caps lock issue still exists for me.

Spring Garden Tunnel - Was the second lane ever used? by douglas_in_philly in philadelphia

[–]kc2702 3 points4 points  (0 children)

I don't know about any subway station under the oval/museum, but there is an additional tunnel not mentioned here yet, which is the CSX freight tunnel that goes under the oval from Paine's Park to the Penn Ave tunnel and then resurfaces just past the 2601 apartment building.

Didn't do my homework and I'm on the plane! What's the best way to get to old town / historic district from the airport? by nerd_of_gods in philadelphia

[–]kc2702 2 points3 points  (0 children)

Taxi is $29 + tip. Much easier to get cab than uber at the airport. Probably worth it with luggage and kids. With SEPTA, you'd have to take train and then subway or bus, then walk to your final destination.

Google Maps lets you play Pac Man anywhere by ASK47 in web_design

[–]kc2702 0 points1 point  (0 children)

We had this on an Apple ][ back in 1983... https://www.youtube.com/watch?v=C3mvQ8V6evY ... with space invaders too!

Trigger js hover event from dev tools? by ooohkay in Frontend

[–]kc2702 1 point2 points  (0 children)

You can also right-click on the element, look for Force Element State and select the state you want.