Router has died. Need Advise Please.

[EddyCurrent]

I would have a look at various manuals for major inverter manufacturers to see what they say, these can be viewed or downloaded as pdf's.
For example an ABB manual says for 1.5kW the input cable should be 2.5mm^2, motor cable should be 1.5mm^2

"Motor cables
(recommended for input cables also)
Symmetrical shielded cable: three phase conductors, a concentric or otherwise
symmetrically constructed PE conductor and a shield

Note:
A separate PE conductor is required if the conductivity of the cable shield is not
sufficient for the purpose"

So in terms of CY cable that's 3 core cable for the motor using the outer as the earth conductor and screen, this should be connected at both ends to obviously act as an earth conductor and to give 360 degree connections for EMC shielding (that's what CY glands are for). If the CY screen is of less cross sectional area than the inner conductors then another core should be used for the earth, i.e. 4 core cable or a separate earth cable run on the outside.

The supply cable could be 4 core armoured.

Before anyone jumps on the well known idea about connecting screens at one end only I suggest you do a search for EMC cable screening first.

[Jonathan]

Bear in mind that ABB's recommendations for cable size are probably trying to cover themselves for most applications, whereas our application is quite specific. For the motor in question, the cables are quite short and the motor will spend most of its life operating well below the rated power. I therefore wouldn't be concerned with recommending 1mm^2 cable in this instance.

Before anyone jumps on the well known idea about connecting screens at one end only I suggest you do a search for EMC cable screening first.

+1 :)

[EddyCurrent]

Bear in mind that ABB's recommendations for cable size are probably trying to cover themselves for most applications, whereas our application is quite specific.

Jonathan, I fully understand what you are saying but it's a bit like the DIY person who installs a new 13amp socket outlet using a bit of 3 core flex because he only wants to plug a table lamp into it. They sell the house and next owner plugs a 3 bar electric fire into it.

[Clive S]

The supply cable could be 4 core armoured.

Eddy Do you not think that this is a bit OTT as on these type of VFD's there is not the provision to connect wire armoured cable with a separate box. I don't know of anybody in a DIY situation that would use it. Just my two cents worth ..Clive

[JAZZCNC]

This is going to sound rich coming from ME but come on Lads don't turn it into an argument and pyshics lesson so to confuse the Man.

Bush Flyer 1.0mm/2 is fine for these Spindles and what I've fitted many times without any issues even on heavy use machines but if you want to cross I's & Dot the T's then use 1.5mm/2.

2.5mm/2 for the VFD Input. If near heavy traffic or chance of damage etc then armoured if not then just use 2.5 Flex not ridged mains cable.

[EddyCurrent]

Eddy Do you not think that this is a bit OTT as on these type of VFD's there is not the provision to connect wire armoured cable with a separate box. I don't know of anybody in a DIY situation that would use it. Just my two cents worth ..Clive

It's recommended that the supply cable also has a screen so I was meaning the supply cable to the control panel enclosure which I assumed would be metal and wall mounted. Just because people keep saying it's DIY I'm not into dumbing things down. I would suggest the supply be fed by a 16 amp minimum supply, if you want a plug and socket then it's the blue type.