Electronics > Beginners
Desoldering station
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FlyingHacker:

--- Quote from: wraper on July 02, 2018, 12:08:25 am ---
--- Quote ---Most devices are only fused on the “live” wire here in the US. So say the piece of equipment has a short to case ground using a good power cable. This blows the fuse on the live wire. Now you move this equipment to another room to try it again to see why it’s not working. You decide to use the power cable that is already in the other room, which, unbeknownst to you, is the power cable with the hot/neutral reverse. You are barefoot on a concrete floor and plug the unit in while touching the metal case. The case in now live because the “neutral” wire is live and there is no fuse on that side.
--- End quote ---
Worst case circuit breaker will disconnect the line wire (and GFCI in modern installations). As long as case is earthed, you won't receive electric shock. If you think that fuse inside the device is supposed to protect you from electrocution, you couldn't be further from the truth.
EDIT: and if case was not earthed, the fuse would not blow in the first place if live wire got shorted to the case.

--- End quote ---

That is correct, but assume the sec9nd outlet has an open ground, or the user has already used a three prong to two prong adapater, bypassing the ground... (yes, getting far-fetched).

 And of course I don’t think a fuse is designed to protect people (other than from fire).

 There are definitely cases where a miswired cable will cause problems, and, again, arguing that a MIS-wired cable that is not wired to specs is just plain silly, not to mention irresponsible.

You may read about the advantages of polarization in many locations online. That is left as an exercise for the reader. Obviously, many people here thought it was important enough to implement it here decades ago.
wraper:

--- Quote from: FlyingHacker on July 02, 2018, 01:55:52 am ---That is correct, but assume the sec9nd outlet has an open ground, or the user has already used a three prong to two prong adapater, bypassing the ground... (yes, getting far-fetched).

--- End quote ---
Too far fetched. Blowing up a device in a good socket first and then plugging it into a faulty socket without earth to get electrocuted. Much higher chance is that line and neutral are reversed in the socket to begin with or device just failed in socket without Earth. In those cases it won't matter at all. Also dunno if you are aware, but IEC mains filters (Y capacitors between live wires and GND) are combined with a socked and are used before any fuse. So with them it completely does not matter at which wire fuse is used.
wraper:

--- Quote from: FlyingHacker on July 02, 2018, 01:55:52 am ---arguing that a MIS-wired cable that is not wired to specs is just plain silly, not to mention irresponsible.

--- End quote ---
Is miswired L/N acceptable? - No. Does it pose any danger? - No. This is what I have to say. You on the other hand made a big fuss, called it "terribly dangerous" even though xytronic does not even have anything to deal with Zhongdi.
Noidzoid:

--- Quote from: innkeeper on July 01, 2018, 11:01:17 pm ---there still in business maybe just email them .... http://www.xytronic.com

@FlyingHacker: xytronic 968 and the ZD-985 are not the same thing

--- End quote ---

Thanks for that, I've been to that url but the "contact us" links don't work on this device (or is it bad links).

You are right of course regarding the machines being different.  This is the one I am referring to...... http://www.xytronic.com/pi/p-968.htm
Noidzoid:

--- Quote from: innkeeper on July 01, 2018, 11:01:17 pm ---there still in business maybe just email them .... http://www.xytronic.com

@FlyingHacker: xytronic 968 and the ZD-985 are not the same thing

--- End quote ---

I did actually manage to get in touch with them and I got a reply saying they discontinued the 968 fifteen years ago and can't find a manual for it.

This made me think two things:

1: Have I made a big mistake acquiring this old machine?

or

2: Is the 968 a good machine as it is still being catered for with spares still available from the likes of Rapid after being discontinued so long ago?

Any thoughts gratefully received.
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