That is exactly right. R56, which by the way is updated every couple of years ago the link to a ten year old one while better than nothing wrong get you compliant to a demanding site owner.
R56 allows no substitution for multiple conductors instead of larger gauges. If I remember correctly supplementary bus bars must have conductors to the main bus bar that: 1 Are at least as large as the largest conductor attached to it. 2. Sized appropriately for the length. ( the gauge increases with length ) 3. Adhere to all the other ground conductor rules like bend radius and so forth. 4. All attachments must use anti ox compound. And a bunch others I can't remember. Honestly, if the site owner is a sticker for R56, I would correct it after an audit find it, unless you are supposed to be the auditor. If he audits once a year I'll bet he always find something if he knows what he is doing. I might be able to find my audit sheet if you are interested. By the way, R56 is only half about protecting equipment. The other half is about protecting people which is why it can get pretty ridiculous. On Fri, Aug 7, 2015, 5:37 PM Justin Wilson - MTIN <li...@mtin.net> wrote: > If the owner wants R56 there will be very specific things that need to be > done whether other things work or not. > > Justin > --- > Justin Wilson <j...@mtin.net> > http://www.mtin.net Managed Services – xISP Solutions – Data Centers > http://www.thebrotherswisp.com Podcast about xISP topics > http://www.midwest-ix.com Peering – Transit – Internet Exchange > > On Aug 7, 2015, at 6:30 PM, George Skorup <geo...@cbcast.com> wrote: > > Yeah, we use those kinds of things all the time for tying a bunch of surge > suppressors in. If it's tied in with everything else at the site, I don't > see a problem with it. > > On 8/7/2015 4:31 PM, Ken Hohhof wrote: > > Only surge protectors? And what kind, POE or coax? > > The reason I ask is if they are POE surge protectors, everything beyond > your 10 AWG wires may be tiny PCB traces and 24 AWG drain wires. At some > point, caring about the difference between a 6 AWG and 2 AWG wire is just > silly. > > If that ground block goes to a rack of equipment, or to coax shield > grounds, or to coax lightning protectors, then maybe it would be best to > put in one of those copper plates with lots of holes and crimp the > double-hole lugs onto the wires and bolt them to the plate. > > > *From:* Adam Moffett <dmmoff...@gmail.com> > *Sent:* Friday, August 07, 2015 3:33 PM > *To:* af@afmug.com > *Subject:* [AFMUG] R56 question > > > The boys used one of these ground bus bars like you would find in an > electrical load center to connect a bunch of surge protectors to a master > ground bus at a tower site. > We're supposed to follow R56 at this site and I think they goofed. I > can't think of an honest reason why it wouldn't be a good ground, but I > don't think it's "by the book" because it can't fit the required #2 wire > that's supposed to go back to the MGB (they used #6). It also can't use > the type of ground terminals called for in the book. > > I hate to make them redo it, and at our own site I wouldn't cry about it, > but this landlord was clear that we have to stick with R56. I'm kind of > hoping one of you tell me it meets the requirements and not to worry about > it. > > <Mail Attachment.png> > > > >
