Wiring control box

[chunkstyle]

Hi All,

I'm in the process of running power from the main panel over to my new prs standard with a 2.2 hsd spindle. This subject has been talked about but I'm wondering what the opinion is on making the final connection of the control box to the supply.
I'm running the ruquired 220V single phase on a 60 amp breaker. I'll be pulling 6 guage wire thru 1" pvc conduit and bringing it over to the wall nearest the contol box.
My thought is to terminate the run of the 6 guage wires to a non-fused service disconnect. I would then like to come out of the service disconnect and into a receptacle box. If I do it this way I could then run an 8 guage SO cord from the control box to the receptacle. Anyone have an opinion on a plug style? I would assume that a twist lock style would be best here.
Does anyone see an issue with this configuration? I am puzzled why SB has the breaker spec'ed for 60 amps but the wire guage at 8. I'm going to run 6 guage to the planned service disconnect but not sure if I can run the spec'ed 8 guage SO cord from the control box to the planned receptacle box without raising an eyebrow from my local electrical inspector.
I will be laying in all the wiring myself but will have an electrician come in to inspect the work before anything gets powered on. I will be upgrading my insurance policy for the BOT and will need to have all the wiring code compliant.
Any advice or opinions would be appreciated.

Regards,
Tim

[jerry_stanek]

My spindle vfd had a long cord on it that I went into a junction box.

[john_l]

I omitted the disconnect on mine only because the breaker panel was within line of site to the controld box. In my case it is actually right next to it.

I understand your question on the wire size relevant to the amp draw stated but I do not have an answer for you. If I were you, I would first give a call to shopbot tech support for clarification on the amp draw at startup and during normal operation of your tool. I would also get your local, trusted electrician involved earlier than just a final inspection because you may have issues that are not even thought of at this stage.

Sorry I couldn't be of more help. Best of luck with the install.

[navigator7]

Also, conduit is sized by the wire size.
That it fits is not important...that is has the space someone long ago deemed large enough is.
You are using the grey pvc, right?

[frank134]

1" pvc is fine. It good for 3#6 and a #10 ground by code. If your under 100 feet don't worry about a voltage drop. why a plug. pipe right in to the control box. the less connection the less problems. Also you don't need the disconnect if you are with in line of site of the breaker for this circuit. Iuse #6. a little over size won't hurt, under size will and there not that much difference between 6 and 8. By the way I am a reg electrican. I hope this help if not e-mail me
frank

[bcondon]

You have me confused... I wired my system
and as I recall, the spindle requires a 240V, 30A circuit and the control panel also requires a 240V 30A circiut.

I ran two separate 30 A circuits in two 1.00"pipe to two 4" square box.
Out of each box, I used a emt box connector from one 4" box to attach SO cable to the control panel. I attached the the spindle controller (VFS?) had its own LONG cable to the other 4" box.

two separate circuits provide much better protection because if your spindle was not on and you had a fault in your control panel, it would not trip the breaker until it was pulling 60 amps. (aka... fire)

I have a 100 Amp panel just for my shopbot room and lights.

If you use a recepticle and plug, get 2 wire with ground twist lock of 30 Amp 220 rating for each circuit (spindle and control panel). I happen to like direct wiring and trip the two double breakers at night.

[Gary Campbell]

Tim...
IF you look here: http://www.shopbottools.com/files/docs/SBG00350090707PRSalphaPowerReq.pdf

It Seems that there is some confusion, even on the SB provided doc. You will need a 30A 110V supply for the control box. AND you will also need a properly sized single or 3 phase supply for the spindle. The linked PDF gives the proper load ratings.

As stated above you want to install 2 separate circuits each with proper load protection.
Gary