lightning surges/strikes

[cvirgil]

An underground duct bank consist of concrete encased PVC conduits. Is there any concern regarding lighting strikes entering the building into the electrcial equipment through the ductbank?

 

[davidbeach]

The duct bank isn't likely to take a lightning strike, but the conductors aren't likely to originate in the duct bank either. Long enough runs and the duct bank will slow down/spread out a lightning impulse to the point of not being a concern, but a short run won't make a lot of difference. As has been said before "it depends."