3 Phase

[No1]

I'm just getting back into 3 phase Installation after a twelve year break, could one of you kind chaps just confirm everything is as it should be with what I'm intending to do?

I have a diesel powered machine that has a conveyer either side of it (one to feed into the machine and one to take the product out) one motor is 8.5A and one is 5.5A 3 phase and earth, I believe these are to be wired via emergency stop etc by the company making the machine back to probably a 16A 3 pin+E plug.

The cable run is 45m and I intend to use 2.5mm 4 core swa that will be clipped to a girder around the building and out to a 16A 3P+E switched socket protected by a 16A type c mcb.

Thanks in advance.

 

[ProDave]

there's a lot more to this than getting the right rating of supply.

Machinery directive for a start, and the first thing is a risk asessment to determine what category of emergency stop and guarding you need.

Best leave this to the machinery company, not an easy thing to just do as a one off.

 

[Andy™]

45mtr is a long run. you may have problems with VD on startup, especially if both motors start at the same time.

 

[No1]

there's a lot more to this than getting the right rating of supply.Machinery directive for a start, and the first thing is a risk asessment to determine what category of emergency stop and guarding you need.

Best leave this to the machinery company, not an easy thing to just do as a one off.

The machinery company will be doing all the wiring for the conveyers all I will be doing is providing them a socket to plug in to.

[quote name='Andy

 

[Sidewinder]

Your total load is 14A?

 

[Joet1110]

No1.

You will get 20volts loss on 1.5mm cable at 45 meters. 2.5mm is more than adequate on a 20Amp breaker. Use C type breaker if using MCB.

Hope that helps

Also I have to add I noticed you said 4 core cable you were thinking...If the starter there using has a single phase contactor coil in you will need a neutral so you will need 5 core. If there using 400v coil then your good for a 4 core. Its always good practice when installing sockets, to use 5 core and provide a neutral for future use. Because whos to say someone might need that socket for something else??

 

[No1]

Your total load is 14A?

Yes, at least that is what I have been told, 1 motor is 8.5A and the other is 5.5A.

No1.You will get 20volts loss on 1.5mm cable at 45 meters. 2.5mm is more than adequate on a 20Amp breaker. Use C type breaker if using MCB.

Hope that helps

Also I have to add I noticed you said 4 core cable you were thinking...If the starter there using has a single phase contactor coil in you will need a neutral so you will need 5 core. If there using 400v coil then your good for a 4 core. Its always good practice when installing sockets, to use 5 core and provide a neutral for future use. Because whos to say someone might need that socket for something else??

Thanks for that, I will go for the 2.5mm 5 core.

Thank you to everyone who took the time to reply.

 

[Andy™]

Would you suggest I use 4mm/6mm swa and uprate the mcb to say a 20A/32A?

you cannot use a 32a OPD if you fit a 16a socket. which you should be fully aware of

 

[Steve3948]

No1.You will get 20volts loss on 1.5mm cable at 45 meters. 2.5mm is more than adequate on a 20Amp breaker. Use C type breaker if using MCB.

Hope that helps

Also I have to add I noticed you said 4 core cable you were thinking...If the starter there using has a single phase contactor coil in you will need a neutral so you will need 5 core. If there using 400v coil then your good for a 4 core. Its always good practice when installing sockets, to use 5 core and provide a neutral for future use. Because whos to say someone might need that socket for something else??

5 Core ?????

SWA 4 Core, 3Ph + N, Armour = Earth.

 

[Joet1110]

Yes sorry. I ment to say I counted my cores wrong. I ment to say use 3P + N