Would like to add that those instructions also include limitations enumerated within the listing standard. E.g. the part of UL 514(B) that says, to paraphase, that a fitting with non-standard male threads shall be supplied with a locknut and shall only be used to connect to a sheet metal enclosure.
I'm still going to make the case that isn't clearly what is meant by the code when it says "instructions included in the listing". The listing is not the standard. If the manufacturers are failing to provide instructions they should be providing then that's between them and the NRTL, and doesn't create a code violation by the installer.
Years ago I worked at two places that had nightly high pressure wash downs and always used quality Thomas & Betts rain tight fitting on EMT conduit with no major water intrusion problems. We tried to avoid entering top of NEMA 4 boxes and start stop stations. I never trust any die cast flimsy fittings. Appears somebody dropped the ball when they transitioned to so called rain tight gathered fittings. Retired but still have a collection of T&B 1/2 to 1"" EMT rain tight fittings that I will use when I get an EV vehicle.
Appears the NEC is more concerned with changing very common names used last 100 years to more confusing terms like Nuetral to grounded conductor, light fixture to luminare and doing metric crap like after guessing over 75 years raised the maximum height to top of a circuit breaker or safety switch handle from 6'6" to two meters ( 6'7" ). Wonder if there even one electrical supply house that you can order say 2" EMT in the metric size the NEC proudly displays.Could be wrong but I thought for one code cycle back in the late 1970's or early 80's the NEC reinvented the wheel when the changed names of 1/0 to 4/0 or maybe 250 MCM to another term. Luckily the supply houses never used they short lived name. Old school and if its not broke why mess with it.
The code has to use grounded conductors as not all grounded conductors are neutrals. It does have rules specific to neutrals.
It has been kcmil for sizes over 4/0 for a very long time.
They can, it is their publication. However that does not apply to the actual code rules. The code is an ANSI standard, and ANSI has rules that must be complied with when an ANSI consensus standard is created or revised.
Another factor that happens is at the MFG side. Original product was designed and submitted for testing and UL listing. Later after receipt of their approved status based on what the mfg. said it would do, product costs changed so substitute inferior materials, and QC changed or totally absent, and this is what we get.
The listing lab is supposed to do follow up random testing to verify those things don't happen.
What cycle of testing/inspection of product do they run on? Do they go to random suppliers and buy off shelf to test or from what the MFG. sends them?
With UL, it is unannounced factory inspections where they pull product off the manufacturing line. Not sure about the other listing agencies.
Appears they had Stevie Wonder test & approve the thousands of 14-50 R EV receptacles that have burnt up in less then a year or two of use.
