Shocking reminder to install ferrule, then install wire, one-at-a-time.

[Recovering EE]

They both hurt
Both cook tissues from the inside

But you can feel the difference
One a shaking spastic pain
One is burning clenching pain

Both kill equally well

My high school physics teacher cooked a hot dog by plugging it into a standard 120V AC outlet, using a "suicide cord" terminated with a couple of forks.

He wore gloves.

I'll never forget that demo, and it gave me a real respect for 120V AC out of the wall...

...but it did smell delicious!

 

[Offgrid Jungle]

They used to sell a hotdog cooker that used a probe in each end

 

[Recovering EE]

They used to sell a hotdog cooker that used a probe in each end

View attachment 250754

Holy smokies Batman!

I think the same geniuses thought that was a safe thing to do as those that marketed Lawn Darts (Jarts).

 

[Crowz]

They used to sell a hotdog cooker that used a probe in each end

View attachment 250754View attachment 250755

Those worked GREAT!

 

[DPC]

DC also disrupts your heart - just in a different way.

Stops it...

I felt that too.
Lucky for me once i got off it my heart rhythm returned to normal.
125 volt DC exciter for an MG set...

The happiest place on earth.
No not really but I so miss this plant.
Photos from the good old days way before me.
Lots of DC and open bus industrial nob and tube stuff you just don't see anymore...


I never took pictures inside
But when built nothing had guards
And it was very easy to get a poke off stuff

You learn quickly in a place like that

Touching things can be deadly

Work with one hand when doing live tests and trouble shooting
Stand on rubber mats
Use insulated gloves
Never touch one machine and another at the same time
Even in un grounded systems
Never be a path of continuity whilst trouble shooting or testing

 

[thomBangor]

Why would you work with live DC if not with live AC? For the same voltage and enough amperage, DC is more dangerous. My theory is that most people's DC experience is with low voltage (and limited amperage). Thus the attitude. Is this why?

AC interferes with heart rhythm so it can/will kill you. DC not as heart-interfering. So, the injuries caused by DC are more severe, but less life threatening.

Also, since you need to complete the loop, AC only requires touching 1 wire if another part of you is conducting to ground. DC requires touching both wires.

 

[thomBangor]

Why oh why are you doing it live?

Mainly because it didn't occur to me to disconnect the MC4 upstream.

I was wiring up the cutoff switch, so no cutoff switch before that. Only way I know of (now) to kill the power before the cutoff switch is to disconnect the MC4 upstream.

 

[hex4def6]

Also, since you need to complete the loop, AC only requires touching 1 wire if another part of you is conducting to ground. DC requires touching both wires.

I'd be very careful assuming that. You could have strange capacitance or paths through the inverter completing the circuit, so to speak.

I was removing old panels from my roof early in the morning, and I managed to get bitten when an MC3 connector that I pulled apart exposed the wire. It was only about 150VDC, rather than the full 500VDC of the array, but I definitely felt a shock.