Disconnecting means

B

brianthejabroni2

Member
So me and my co worker are going back and forth. We’re wiring up 800a feed to motor and the disconnecting means is 20’ up attached to busduct. Wiring goes to VFD Shouldn’t we have an additional 800a disconnect that is accessible down next to VFD ?

I’m thinking we need an additional disconnect that is accessible. Am I wrong?
 
I don't have my code book handy. But I believe this is OK. Switches connected to bus ducts that can be reached by (essentially) a long stick satisfy the rules.
 
Isn't brianthejabroni2 asking about a service disconnect means or would this not apply to motors?
My memory could be out of date but I remember a service safety disconnect
being "accessible within sight less than 50'." or does only apply to manufactured equipment?
 
Then "in sight from" from apply to the controller (430.102) and possibly the motor unless one of the exceptions apply,
A Buss switch could comply depending on details.
 
DooWop said:
Isn't brianthejabroni2 asking about a service disconnect means or would this not apply to motors?
My memory could be out of date but I remember a service safety disconnect
being "accessible within sight less than 50'." or does only apply to manufactured equipment?
Click to expand...
I just know we think of things like motors or equipment as have a disconnecting means to "service" the equipment but the term service disconnect has specific meaning in the NEC and shouldn't be used when the actual question is regarding a disconnecting means for the equipment or in this case a motor.
 
Might be allowed but as a long time electrician that had to PM, & troubleshoot & repair hundreds of drives I always ordered replacement drives that did not have a disconnect close by to come with a built in disconnect switch. Problem with buss duct disconnects too often they had rows of pallets, 55 gallon drums etc requiring several.minutes to move to be able to use a long pole to turn on & off.
 
garbo said:
Might be allowed but as a long time electrician that had to PM, & troubleshoot & repair hundreds of drives I always ordered replacement drives that did not have a disconnect close by to come with a built in disconnect switch. Problem with buss duct disconnects too often they had rows of pallets, 55 gallon drums etc requiring several.minutes to move to be able to use a long pole to turn on & off.
Click to expand...
Well, that would be a "condition" in which it wouldn't qualify then...

My take is that if there is any doubt, put one in.
 
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