- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
This is not an NEC question, for I know that the NEC would allow what I want to do. The relevant code is unique to the client. My question is one of physics, and of just generally what is the right thing to do.
Consider a 40 foot shipping crate that has been outfitted with beds, tables, and other living accommodations. These things are called ?containerized living units,? or simply CLUs. Consider stacking these things three high, with such stacks side-by-side to create something that looks vaguely like a housing building. Each CLU has a 60 amp, single phase panel.
Our contractor wants to serve each CLU with LFMC attached to a large plug. I agree. The client insists that their rules require the use of GRS and a hard-wired connection at each CLU.
Question: Given that a stack of three CLUs will likely experience some swaying in the high winds that are common to the area, is the use of hard pipe (GRS) even a safe alternative? Would not the motion of the upper CLU in relation to the lower ones cause a strain on the GRS, and perhaps even cause a support to break?
Consider a 40 foot shipping crate that has been outfitted with beds, tables, and other living accommodations. These things are called ?containerized living units,? or simply CLUs. Consider stacking these things three high, with such stacks side-by-side to create something that looks vaguely like a housing building. Each CLU has a 60 amp, single phase panel.
Our contractor wants to serve each CLU with LFMC attached to a large plug. I agree. The client insists that their rules require the use of GRS and a hard-wired connection at each CLU.
Question: Given that a stack of three CLUs will likely experience some swaying in the high winds that are common to the area, is the use of hard pipe (GRS) even a safe alternative? Would not the motion of the upper CLU in relation to the lower ones cause a strain on the GRS, and perhaps even cause a support to break?
