Disconnecting means

[patpappas]

I have been searching (NEC) to find when or where a disconnect for a transformer should be placed, transformer is located over a panel w/main breaker, primary is 30' away and in another room.

 

[raider1]

The primary overcurrent device for a transformer is not require to be within sight of the transformer.

Chris

 

[patpappas]

The primary overcurrent device for a transformer is not require to be within sight of the transformer.

Chris

Does the NEC say that anywhere?

 

[augie47]

Does the NEC say that anywhere?

more importantly, with the NEC being a "permissive" Code, it does not say the disconnect has to be at the transformer.

 

[raider1]

I agree with Gus.

The proper question should be where in the NEC does it say that a transformer requires a disconnecting means within sight from the transformer.

Chris

 

[charlie b]

When I see the phrase, "disconnecting means," I envision a device capable of turning something off, without necessarily providing overcurrent protection. More to the point, and as an example, even if a motor and its branch circuit conductors are protected against overcurrent, we still need to put a disconnect within sight of the motor. I don't think a transformer is required to have such a thing. It must be protected against overcurrent. But the device that accomplishes that mission need not be within sight.

 

[patpappas]

The "in sight" was what started the argument about the disconnect. My point was where do you find it in the NEC, I could not.

 

[raider1]

The "in sight" was what started the argument about the disconnect. My point was where do you find it in the NEC, I could not.

As I said earlier, there is no requirement for a disconnecting means for a transformer. There is a requirement for primary overcurrent protection (See 450.3) but the OCPD does not need to be "in sight of" the transformer.

Chris

 

[raider1]

When I see the phrase, "disconnecting means," I envision a device capable of turning something off, without necessarily providing overcurrent protection. More to the point, and as an example, even if a motor and its branch circuit conductors are protected against overcurrent, we still need to put a disconnect within sight of the motor. I don't think a transformer is required to have such a thing. It must be protected against overcurrent. But the device that accomplishes that mission need not be within sight.

Well said Charlie, I agree 100%.

Chris