Low voltage question

[SunEagle]

Not to be rude but 48v could not burn up butter.

I wouldn't place a wrench between the terminals of a 12volt battery.

[Mike90250]

Actually, in a bathtub, you can get a pretty bad shock from 48V. Once the water has reduced your skin resistance, 48V can be down right nasty. When dry, it's pretty safe to touch.

[Salts]

Not to be rude but 48v could not burn up butter.

Have you ever shorted the terminals of a 12 volt car battery with a wire or a wrench?

If you use a 12 volt switch on a 48 volt system, it will probably work for a while if you're using it in a very low power application. It won't be safe, but I'm guessing it would work, for a while anyhow. When it stops working, it might stop working because the contacts welded themselves shut and you will be unable to open the switch.. or it might stop working because the contacts have been corroded away over time because they're not rated for the higher voltage and they stop making a connection.

Unlike plumbing stuff where you can mop up and dry the water, electrical mistakes are not always very forgiving as they tend to either kill you or start fires.

Are you sure you want to ride that train?

[Salts]

Actually, in a bathtub, you can get a pretty bad shock from 48V. Once the water has reduced your skin resistance, 48V can be down right nasty. When dry, it's pretty safe to touch.

Or add some salt to the water...

[-robw-]

I wouldn't place a wrench between the terminals of a 12volt battery.

Amps

[sdold]

Amps

It takes amps to produce power, along with the volts. If no amps flow, the butter will not melt.

[-robw-]

Actually, in a bathtub, you can get a pretty bad shock from 48V. Once the water has reduced your skin resistance, 48V can be down right nasty. When dry, it's pretty safe to touch.

I work telecom and pots 100+ ring volts. Even in rain I don't care. Feel it, sure, but it's more an inconvenience. How 2 1/4 inch contacts made to handle 300+ amps can't handle it remains unanswered.

[-robw-]

Have you ever shorted the terminals of a 12 volt car battery with a wire or a wrench?

If you use a 12 volt switch on a 48 volt system, it will probably work for a while if you're using it in a very low power application. It won't be safe, but I'm guessing it would work, for a while anyhow. When it stops working, it might stop working because the contacts welded themselves shut and you will be unable to open the switch.. or it might stop working because the contacts have been corroded away over time because they're not rated for the higher voltage and they stop making a connection.

Unlike plumbing stuff where you can mop up and dry the water, electrical mistakes are not always very forgiving as they tend to either kill you or start fires.

Are you sure you want to ride that train?

Amps

[-robw-]

It takes amps to produce power, along with the volts. If no amps flow, the butter will not melt.

Never tried it but I assume this is correct. So, if 300 amps x 24 v will work with this particular switch, why won't 50 amps x 48 v.? It's true, but it makes no sense to me.

[Mike90250]

Never tried it but I assume this is correct. So, if 300 amps x 24 v will work with this particular switch, why won't 50 amps x 48 v.? It's true, but it makes no sense to me.

The higher voltage sustains an arc more than lower voltage. The arc damages the contacts. With an MC4 connector, the damage to the plated contacts is instantaneous and a connector mated or demated in a powered circuit, is ruined.

With heavier contacts, there is still damage, but not as apparent on the first couple of cycles.

We're telling you there is a difference and you should not do it. But we're not inspecting you and you are going to do whatever you want, regardless what we advise you.

[-robw-]

The higher voltage sustains an arc more than lower voltage. The arc damages the contacts. With an MC4 connector, the damage to the plated contacts is instantaneous and a connector mated or demated in a powered circuit, is ruined.

With heavier contacts, there is still damage, but not as apparent on the first couple of cycles.

As hard as it for me to comprehend 48v doing any damage to plate steel, you have described the result perfectly. It would pass energy for an hour or so, and then just stop.

I guess your explanation is why the following 2 ANL's have different surfaces. A 12 and 60 volt ANL:
12.jpg60v.jpg

[ButchDeal]

As hard as it for me to comprehend 48v doing any damage to plate steel, you have described the result perfectly. It would pass energy for an hour or so, and then just stop.

well here is 24V doing some welding... https://www.youtube.com/watch?v=PV5oLPLUzrM

[neweclipse]

How 2 1/4 inch contacts made to handle 300+ amps can't handle it remains unanswered.

We have tried very hard here...You are talking apples to oranges...you may as well give up...you see what you want and ignore what your mind is incapable of understanding...give up!

[SunEagle]

Amps

It still comes down to "resistance". Low resistance can cause a burn even in a 48V circuit.

Again do what you want but don't say we didn't warn you that using a low voltage rated switch on a higher voltage circuit is not safe.

[Salts]

well here is 24V doing some welding... https://www.youtube.com/watch?v=PV5oLPLUzrM

I have a Miller 251 MIG welder and I usually set it for around 18 to 19 volts for 1/4 inch plate. I might jack it up to 21 for 1/2 inch plate.

I'm 100% confident when I say it WILL melt butter.