2 quick questions... April 28, 2015 11:07PM |
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Re: 2 quick questions... April 29, 2015 12:31AM |
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Re: 2 quick questions... April 29, 2015 12:34AM |
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Re: 2 quick questions... April 29, 2015 03:27AM |
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Re: 2 quick questions... April 29, 2015 07:58AM |
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Quote
tadawson
Typical color codes are black - line, white - neutral and green - ground (in the US at least) and brown - line, blue - neutral, green - ground internationally. I can't say that I have ever seen purple - any chance it's just a funky brown? In any case, multi voltage power supplies these days are not terribly picky about line/neutral reversal, since they will be getting two hot legs (at least in the US) on a 220v service anyhoo. If it's a 120v only power supply, then it may well matter very much . . . In any case, it pays to get it right . . .
- Tim
Re: 2 quick questions... April 29, 2015 11:22AM |
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Re: 2 quick questions... April 29, 2015 11:35AM |
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Re: 2 quick questions... April 29, 2015 11:59AM |
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Re: 2 quick questions... April 29, 2015 09:00PM |
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Quote
DonaldJ
Have you tried using a multimeter?
Re: 2 quick questions... April 30, 2015 11:36AM |
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Re: 2 quick questions... April 30, 2015 12:04PM |
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If he has a polarized plug (and a properly wired outlet) a multimeter would tell which colored wire is connected to which spade. So he could could hook up the line to the hot and neutral to the neutral. It likely doesn't matter, but in case it does...Quote
alan richard
What will a multimeter tell him?
That AC supply has neither +ve or -ve
-a
Re: 2 quick questions... April 30, 2015 03:54PM |
Registered: 8 years ago Posts: 158 |
Thanks everyone. Concerning getting a new wire, will it actually be red and black so I don't need a multimeter?Quote
itchytweed
Quote
DonaldJ
Have you tried using a multimeter?
+1 on the multimeter testing as well. On the two wire plug, the narrow spade is the hot side and the wider blade is neutral. I would ditch that two wire cord and get a three wire cord from a hardware store and used the L, N, and GND terminals. Plus, if you are hooking up a computer to talk to this as well, put both the RepRap and the computer from the same socket.
Re: 2 quick questions... April 30, 2015 04:11PM |
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Re: 2 quick questions... April 30, 2015 05:11PM |
Registered: 8 years ago Posts: 158 |
I'm not a child if that's your concern. I understand many ac adapters do, but wires that don't have a third prong do not have a ground, so no. Not all power cords have a ground. As a matter of fact, so many power cords dont have a ground that most splitters dont even have the third prong on them. No offense, but the company I bought it from has sold many. No one has been killed, but I simply needed to know which one is the neutral and which is live. I understand no one knows, so I'm willing to get a regular power supply.Quote
gordonendersby
Im not sure how old you are but please have a word with someone who understands mains power in your region or you will hurt either yourself or someone around you.
That power supply needs 3 wires to your wall outlet.
Live, neutral and earth. 2 wires are not safe without that earth connection.
In the Uk we have 3 pin wall plugs. with clearly marked Neutral, live and earth connections. L,N,E
Gordon
Re: 2 quick questions... April 30, 2015 09:30PM |
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Re: 2 quick questions... April 30, 2015 11:24PM |
Registered: 8 years ago Posts: 158 |
Quote
blabbersnitch
There are good reasons why you sometimes see two pins and sometimes see three. I expect you need three.
My knowledge comes from Australian wiring, but I expect protection methods against electrocution are universal.
Appliances generally use one of two methods to protect you and me from electrocution.
1. Double Insulation (class 2). Accessible parts have (at least) two layers of isolation between them and internal live parts. The only way accessible live parts can become live is if both insulation layers fail. These appliances do not use Earth for protection and so only have the Active and Neutral pins on the plug. (These appliances usually have a symbol on them: one square inside another square.)
2. Earth (class 1). Accessible parts can become live in the case of a fault. Your 12V power supply looks like one of these. It is appears encased in metal and it would be quite possible that if it were dropped and something became loose, or if water got on it, or something like that, the outer case could become live and if you (or anyone) then touched it, you could die!
(there is a '3' - class 3 - for extra low voltage.. such as your car battery.. but that's not what's being discussed here).
As I have said, your power supply needs an earth. This is also evident by the fact that is has an earth terminal. I would not use the the plug they provided if it does not have an earth wire.
Neutral is usually connect to earth somewhere in the distribution system (here in Australia anyway). So identifying Active and Neutral can be done by measuring their AC voltages with respect to earth. Active will be about your phase voltage, and neutral will be about zero.
Re: 2 quick questions... May 01, 2015 04:05AM |
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Re: 2 quick questions... May 01, 2015 08:54AM |
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Re: 2 quick questions... May 01, 2015 10:38AM |
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Re: 2 quick questions... May 01, 2015 02:03PM |
Registered: 8 years ago Posts: 158 |
I appreciate it. I wasn't sure if the PC cable would be good enough. Thanks.Quote
dc42
A PSU capable of 20A output @12V is normal for a 3D printer with heated bed. A typical heated bed takes 10A or more by itself. These types of PSU always need a mains ground connection. The current drawn from the 110V or 230V mains will be much lower, e.g. about 6A @ 110V, so a normal PC type mains power cable is suitable.
Re: 2 quick questions... May 01, 2015 10:01PM |
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Re: 2 quick questions... May 02, 2015 02:58AM |
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