lightning protection requirements

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anthony001

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Does anyone know off hand about proximity requirements between a delta lightning protection groung and a delta service ground. thanks in advance for the replies.
 
I assume that the term "delta" used in this question refers to the grounding electrode configuration versus a "delta" transformer configuration...

I also assume you are questioning how far apart these grounding systems need to be installed. In that case, 6 feet is the magic number. However, it would be advisable to keep the electrodes separated no closer than the length of the longest rod. The two systems must always be bonded together.

Please clarify if this doesn't answer your question.
 
I am confused by your question also. You place your rods no closer than twice the rod length in the ground. So if your rods are 8 feet in length, they need to be at least 16 apart.

As stated the lightning protection system has to bonded to the electrical service ground preferable at one point only.
 
dereckbc said:
I am confused by your question also. You place your rods no closer than twice the rod length in the ground. So if your rods are 8 feet in length, they need to be at least 16 apart.
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Just a note that the NEC only requires 6' sepertion but I would rather follow Dereck's good advice.
 
Yes, you are right. What I was trying to say was a delta configured lightning protection ground rod system is called for. These rods, I had planned to keep ten feet apart from one another. Same for the service configuration. My question is weather their are any requirements on how far apart the two systems had to be from each other. Thanks guys first time doing lightning protection, if anyone has any additional advice on the subject I would appreciate the heads up.
 
From the link I posted above:
How the UL Master Label Certification Program works:

UL has made the process of obtaining a Master Label Certificate quick and easy. UL field representatives visit your location to check your lightning protection system after it has been installed. Initial inspections can take between one-hour or an entire day, depending on your system?s complexity. UL Master Label Certificates are issued within 48 hours of the completion of the inspection or after variances are corrected.

After the system has been installed, the UL Listed installer completes and submits the certification application.
Your lightning protection system is assigned to a UL field representative who inspects the installation and instantly communicates the results electronically to UL and the installer.
If necessary, a letter detailing any variances is issued to the installer. After variances are corrected, the installer resubmits the application for re-inspection. In some instances, system designs and variance corrections can be reviewed electronically.
The UL Listed installer forwards the certificate to the premise owner/operator, and posts the certificate on this Web site providing proof that the lightning protection system is in compliance with NFPA and/or UL Standards.
Certificates must be renewed every five years.
Contact your installer, if your building changes structurally or if modifications have been made to the system during the five-year period that your certificate is in effect. Your installer can repair or modify the system and make arrangements to have it re-evaluated by UL to determine its continued compliance with UL and/or NFPA Standards. This is required to maintain your certificate!

For more information related to UL?s Master Label Certification program for lightning protection systems or to find a UL Listed installer in your area, please contact a UL customer service professional toll-free at:
Underwriters Laboratories Inc.
+1-877-UL-HELPS (+1-877-854-3577)
E-mail: LightningProtection@us.ul.com
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