new122
Member
- Location
- Cincinnati, OH
Does UL 508A 66.6.1.A should mean that Disconnect Switch Should physical mounted on top of all other components except Terminals?
Does UL 508A 66.6.1.A should mean that Disconnect Switch Should physical mounted on top of all other components except Terminals?
66.6.1 A disconnecting means shall be provided for each incoming supply source. Other than terminals,
no components shall be located on the line side of the disconnecting means.
Perhaps you can rephrase your question. I am not sure just what it is you are asking. My copy of the standard does not have a paragraph 66.6.1.A. Just 66.6.1.
I actually think it probably means you cannot locate components physically on the line side of the disconnect. that makes sense to me since you need that space for incoming conductors.Methinks he is misinterpreting the "A" that begins the sentence with being part of the paragraph number...
New122,
They are not referring to the physical location of the disconnect device, they are referring to the electrical flow. The main disconnect must disconnect all power coming into the panel, with the exception of the line terminals of the disconnect itself. Nobody cares where you decide to locate the switch, but the CONVENTIONAL wisdom is to put it in the upper corner, opposite of the enclosure door hinge. That is the way all Flange Mount Disconnect Enclosures are made, but if you use a rotary through-the-door operated switch, it can go anywhere you like.
But it leaves a whole rat's nest of interpretation on just where the physical line side of the disconnect is in a three dimensional system!
Unless they are talking only about the inside of the disconnect enclosure and not the whole assembly, as the OP seems to be interpreting it.
Yes, but look at the context; that section of 508 is all about the power WIRING, not component layout, clearances etc. The issue of not putting anything physically in front of the line terminals would be covered by the wire bending space requirements.
INDUSTRIAL MACHINERY
65 General
65.1 These requirements cover industrial control panels for industrial machinery (NFPA 79, Electrical
Standard for Industrial Machinery). The following types of machines are identified as industrial machinery: