Which thickness CY cable do I need for 1.5kW spindle?

[A_Camera]

6A for Control Signals.!!!!!. .

Don't worry Bee it will be fine. These spindles at full load only pull 8A. In practise and while heavy cutting they actually rarely pull above 5A. 0.75mm2 is rated 6A and this is very conservative rating. Again in practice and for the very rare occassions you do pull full load of spindle/VFD it will easily allow to pull 8-10A without any trouble. In case of Short Circuit the VFD it's self will protect you with it's Max current setting and then you have the Fuse.

You can't ONLY go only after currents, if that was all that mattered we could use hair thin wires for all type of communications. You are blindly staring at one parameter only.

Generally speaking, yes, 0.75mm2 is enough for most cases for the spindle, but why use something as thin as that if 1.5mm2 is safer, stronger, not much heavier, better suited for the purpose and hardly much more expensive. Can you come up with ONE good reason other than most people don't continually use up more than 5A?

I chose 0,75mm2 for the control signals because that is what I have, apart from 1.5mm2 and FTP CAT6 cables (0.5mm2), so I chose the 0.75mm2. The FTP cable would be good as well, but I like the Ölflex cable more, it is easier to handle for the purpose.

[JAZZCNC]

Generally speaking, yes, 0.75mm2 is enough for most cases for the spindle, but why use something as thin as that if 1.5mm2 is safer, stronger, not much heavier, better suited for the purpose and hardly much more expensive. Can you come up with ONE good reason other than most people don't continually use up more than 5A?

I could but won't get into slanging match with someone so narrow minded. I'm also not saying I would have used 0.75mm2 because I wouldn't have. However only because I have 1.0mm2 & 1.5mm2 which use all the time. If I'd only had 0.75mm would have used it.

The point of my first post was more to re-assure the OP "Bee" that his choice, which he'd already purchased before you posted would be fine. This by now he surely knows because some Muppet started up the thread again 3 mth's after he posted.!!

[A_Camera]

I could but won't get into slanging match with someone so narrow minded. I'm also not saying I would have used 0.75mm2 because I wouldn't have. However only because I have 1.0mm2 & 1.5mm2 which use all the time. If I'd only had 0.75mm would have used it.

The point of my first post was more to re-assure the OP "Bee" that his choice, which he'd already purchased before you posted would be fine. This by now he surely knows because some Muppet started up the thread again 3 mth's after he posted.!!

OK, so you would not use 0.75mm2, just want to comfort someone who bought the cable... well, the reason for the Muppet to start up the thread LESS than 2 mnts after Bees last post was to try to open the minds of those who are not sure, so they just follow the stream and go after the majority on these forums. I think that can hardly be called narrow minded, more like an effort to help. Considering the costs of the cable, and compared to the price of the CNC the "use what I have available" principle is really very narrow minded and wrong. Apparently you are more keen on name calling than admitting that I was right, there are ONLY advantages of a stronger, better cable, no disadvantages. You don't answer my question because there is just one answer. Anyway, at least in this post, you made it clear that the 0.75mm2 would have not been your choice, so basically, we actually agree.

...and in all honesty, if you really know what I think you know, then I don't think you would have used 0.75mm2 cable if that was all you had at home. I think you would have done the same I would have done, ordered 1.5mm2 and possibly used the thinner one until the better one arrives...

Like I said, what works and what is right are not necessarily the same.

[JAZZCNC]

Apparently you are more keen on name calling than admitting that I was right, there are ONLY advantages of a stronger, better cable, no disadvantages. You don't answer my question because there is just one answer. Anyway, at least in this post, you made it clear that the 0.75mm2 would have not been your choice, so basically, we actually agree.

I wasn't name calling more stating the obvious. IMO it's muppet with over active Ego that posts reply to question which had been answered already and acted upon by the OP months ago.!
I don't doubt your knowledge of electricker and in principle Yes your correct so if your Ego needs a massage I'll glady ablige and say I agree that 0.75mm shouldn't be first choice.
However the fact still remains 0.75mm2 would and will work perfectly fine. All your arguments regards Cable strength, ridgidty etc are mute because it's stupid thing to rely on cable for strength when it should be supported with bracket. The Only thing that matters is if cable can handle the load of the device it's powering while in prolonged use and clearly it can.

...and in all honesty, if you really know what I think you know, then I don't think you would have used 0.75mm2 cable if that was all you had at home. I think you would have done the same I would have done, ordered 1.5mm2 and possibly used the thinner one until the better one arrives...

Why would you presume to predict what I would do.? . . . I don't know me so you or anyone else stands NO chance predicting my actions.!!
If I'd took the time effort to fit it then I'd consider it safe and it would stay on. The ONLY time I might do this is in emergency situation to get machine up and running.

Like I said, what works and what is right are not necessarily the same.

This is contradiction.!! . . . . . If it's working Correctly then it's Right.!!

[lucan07]

This is contradiction.!! . . . . . If it's working Correctly then it's Right.!!

Glad to hear it JAZZ I was almost ready to swap out the 6560 on the Sieg conversion but now you say its right I will leave it where it is!

[JAZZCNC]

Glad to hear it JAZZ I was almost ready to swap out the 6560 on the Sieg conversion but now you say its right I will leave it where it is!

Performance upgrade is different animal.!! . . . Fatter cable won't make spindle go any faster.

[A_Camera]

This is contradiction.!! . . . . . If it's working Correctly then it's Right.!!

No it's not. But I am tired of this discussion, so I will just leave it at that.

...and yes, being called narrow minded is indeed name calling and no, I have no ego problems, it seems that my short comment hurt other peoples ego, not mine.

[paulus.v]

It is thinner and lighter but it should be 1.5mm2. 0.75mm is OK for control signals but actually too thin for the power.

You do not say that you prefer or recommend using thicker cables to be on the safe side or you normally have them at hand or you don't mind wasting a valuable metal with finite resource here on earth. But you say that a 1.5KW spindle cable should be 1.5mm2 and the control cables 0.75mm2 (when most control cables are 0.25mm2). This approach is all wrong!

[A_Camera]

You do not say that you prefer or recommend using thicker cables to be on the safe side or you normally have them at hand or you don't mind wasting a valuable metal with finite resource here on earth. But you say that a 1.5KW spindle cable should be 1.5mm2 and the control cables 0.75mm2 (when most control cables are 0.25mm2). This approach is all wrong!

Yes, well... many people have electrical issues...

I think that line is pretty clear, but sure, this is the internet, so if something can be misinterpreted you can be sure someone WILL misinterpret it and start a stupid fight about it.

Regarding the environmental issues... well... the way I see it is that basically EVERYONE on this forum, and every other similar forum, is wasting valuable metal with finite resources here on earth, because hand on your heart... how many of us MUST have the machines we have? To me this is just a hobby, as it is for most people on these forums. You, and everyone else on this forum (including myself) are HUGE contributors to global warming, the using up of finite resources and everything else environment activists can come up with. So, please don't beat your chest and be proud about yourself just yet or accuse me for being an enemy of the earth... you know nothing about me or how I am living, so leave that out.

Besides, who says that the cable must be wasted? It can be used in another project or sold to somebody else for re-use.