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Here is a transfer switch added to accommodate a new generator installation to an existing dwelling unit. The electrician removed the service panel board guts and flipped them upside down to have the top feed lugs be on the bottom.
He then rerouted the service entrance conductors from the meter at the top of the existing service, through a raceway over to the new automatic transfer switch (ATS) which now becomes the first service disconnect. From there, the feeders run from the bottom side of the service disconnect inside the ATS, back through the same raceway over to the existing service panel and land on the bottom lugs. Are there any code violations as installed?
Based on the language for an overhead type fuel dispenser in NEC Table 514.3(B)(1) (quoted word for word on the right side of the picture), is the panel and lighting contactor code compliant? Neither are rated for Hazardous locations. Any other thoughts or concerns about this installation? Do we have any HAZ LOC electricians out there?
This two-gang switch box contains both 12 AWG and 14 AWG conductors. ALL neutrals are grouped under the same red wire nut.
In the back, all equipment grounds are grouped under another red wire nut. How does everyone feel about that? The 12 AWG circuit is supplied from a 20A breaker. The 14 AWG circuit is supplied from a 15A breaker.
Here is a follow up to yesterday's post regarding the acorn clamp on the concrete encased electrode....This picture shows the other end of the rebar stubbed up into the wall after the concrete is poured. According to NEC 250.52(A), the concrete encased electrode can consist of 20 foot of 1/2 inch or larger rebar or a 4 AWG bare copper wire. According to NEC 250.68(A), if it's not buried or irreversibly connected, such as a cadweld, the clamp used to connect the concrete encased electrode must be accessible which is why the blue plastic mud ring is used on the other side of the plywood in the picture. Here is a link to more info on using an acorn clamp on rebar...https://iaeimagazine.org/…/are-there-any-acorn-clamps-list…/
Home made deadfront. This one was caught by the inspector when he was called to inspect the new circuit added in the liquidtight raceway under the panelboard. The electrician who installed the new circuit stated that he wasn't responsible for the deadfront and that it was like that before he showed up. Should the inspector pass the new circuit?
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A 10 AWG type THWN copper conductor in a raceway is rated to carrry 35 amps according to NEC ampacity Table 310.15(B)(16). Does everyone agree that it is code compliant to install a 10 AWG copper type THWN conductor in a raceway to supply this rooftop air conditioner, and protect it with a 60 amp breaker? The breaker and the terminals in the HVAC unit are rated at 75 degrees C and lets assume that no derating or correction factors need to be applied.
Nice job folks! Many sharp electricians had great comments on this yesterday. Whoever installed this is making everyone around them unsafe.
First off, to clarify a few comments we had yesterday, this was a single phase, 240V installation into a NEMA 3R switch. All conductors shown are 1/0 AWG except the parallel equipment grounds. The equipment being supplied did not utilize a neutral conductor and therefore, since these were not service conductors, a grounded neutral conduct...or was not required by code to be run to the switch. The rules in NEC 230.7 on installing line and load conductors together did not apply since they are only applicable to service conductors and non service conductors in the same “service raceway or service cable”. The type of wire used had an insulation type that required a raceway or other NEC chapter 3 wiring method. The only thing that was done correctly is installing the yellow caution tape around this installation!
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How many things can you find wrong with this one? Should be at least 8 but could be more. FYI, the 1/0 AWG conductors at the top of the disconnect are not service entrance conductors. They come in from the back, go through the switch, then exit and go back to the equipment enclosure behind it where they came from. The switch was installed after the inspector red tagged the installation for not having a disconnect switch within sight of the equipment on the other side. We will post answers and code sections tomorrow.
I have an idea, lets install a conduit, and use a PVC water pipe tight 90, and paint it grey, and call for inspection while the trench is still open. Thats exactly what happened here. Photo taken by the electrical inspector. This is not a joke and it happens more than you think... Try pulling through that....