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This Workshop is intended for electricians, engineers, designers, project managers, and contractors because it will describe and discuss the following information:
– · The National Electrical Code (NEC) requires electrical systems to be effectively grounded.
– · However, effective grounding is poorly understood, even by engineers, because soils are not understood and a soil resistance test is seldom performed.
– · Soil types such as loam, sand, gravel, rocky soil, shallow soil over bedrock, and bare rock each require different approaches to achieve an effective electrical grounding
– · Particular attention will be given to methods for designing effective grounding in poor soils and on rock.
– · There are 7 NEC approved methods of grounding electrodes, with concrete encased electrodes being the best, and 3 types of electrodes forbidden.
– · Soil resistance can be measured with a 3-point resistance testing which will be explained and demonstrated.
– · Lightning protection grounding practices are very similar to electrical grounding but do have some differences in requirements and practices.
– · Lightning protection grounding requirements and practices are presented in National Fire Protection Association (NFPA) standard 780 while the NEC is NFPA 70E. However, grounding on bare rock such as a mountain top requires some unusual practices.
During this presentation, questions are encouraged and may even be required. Attendees will afterwards be sent a certificate for 7 Professional Development Hours (PDH).
Friday March 27, 9 am to 5 pm including breaks and lunch.
Co-sponsored by: James Mercier
Speaker(s): James Mercier,
Agenda:
How can you achieve a suitable electrical ground on:
· bare rock
· pure clay
· desert
· or dry rocky soil?
– There are 7 NEC approved methods of grounding electrodes, with concrete encased electrodes being the best and 3 types of electrodes forbidden.
– Soil resistance can be measured with a 3-point resistance testing which will be explained and demonstrated.
– Lightning protection grounding practices are very similar to electrical grounding but do have some differences in requirements and practices.
– Lightning protection grounding requirements and practices are presented in National Fire Protection Association (NFPA) standard 780 while the NEC is NFPA 70E. However, grounding on bare rock such as a mountain top requires some unusual practices.
During this presentation, questions are encouraged and may even be required. Attendees will be sent a certificate after the workshop for 7 Professional Development Hours (PDH).
Room: Bear Creek – 2nd Floor, Limelight Hotel, 1295 University Ave, Boulder, Colorado, United States, 80302