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Are concentric or eccentric knockouts evaluated for bonding?
#93789
06/18/05 12:06 AM
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Joined: Oct 2000
Posts: 2,749
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Just to be sure, you should read the following information very carefully, when evaluating concentric and eccentric knockouts: http://www.ul.com/regulators/knockouts.cfm
Joe Tedesco, NEC Consultant
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Re: Are concentric or eccentric knockouts evaluated for bonding?
#93790
06/18/05 03:16 AM
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Joined: Feb 2003
Posts: 27
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Intresting have you seen any boxes or cabinets marked? I will be looking for them but I still probably still bond bush so not to upset an inspector who hasn't seen the marking, plus just assurance that it is bonded and be ease of mind.
William Runkle
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Re: Are concentric or eccentric knockouts evaluated for bonding?
#93791
06/18/05 05:14 PM
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Joined: Oct 2000
Posts: 2,749
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Yes,
The following table summarizes the box and enclosure categories where such an evaluation is available and how to identify compliant products that can be installed according to the exception to Section 250.97.
Category Code Product Category Concentric and eccentric knockouts evaluated for bonding? BGUZ Boxes, Junction and Pull Only when product is marked* CYIV Cabinets and Cutout Boxes Only when product is marked* QCIT Metallic Outlet Boxes All products comply
* Products Listed for these applications are provided with a marking, such as "Concentric (or eccentric) knockouts suitable for bonding conduits for non-service conductors."
Joe Tedesco, NEC Consultant
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Re: Are concentric or eccentric knockouts evaluated for bonding?
#93792
06/23/05 03:38 PM
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Joined: Jun 2003
Posts: 1,143
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+1 for the additional bonding.
The $8 in parts is worth more than 20 minutes proving your point to an inspector.
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Re: Are concentric or eccentric knockouts evaluated for bonding?
#93793
06/23/05 04:40 PM
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Joined: Dec 2004
Posts: 94
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Just knock out the KO all the way and use reducing washers. They are UL listed for grounding. Save the cost of the bond bushings.
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