Industrial Switch Gear at Dwelling

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ramsy

NoFixNoPay Electric
Location
LA basin, CA
Occupation
Service Electrician 2020 NEC
I just wanted to shut off breaker for porch lights.

Look what I found. What is this monster 400A switch gear with "High Voltage" placard.

"High Voltage" must be a gag. No way primary 12k volt to 240v secondary xfmr fits in there?
 

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I have a customer with one like that outside their house.

Either it was industrial equipment gotten cheap, or that was the way resi 400A services were done back in the day.

Can't ask the old man, he is no longer with us.
 
That reminds me of a service call I did to a house once. It was an old man who at one point had been a maintenance man for a factory. I went to check the breaker and found a giant panel that had previously been 480 volt 3 phase but he took it home to replace his 100 amp single phase fuse box back when he was still working. It was ridiculous but from a nerd point of view it was kind of cool looking.
 
ramsy said:
"High Voltage" must be a gag. No way primary 12k volt to 240v secondary xfmr fits in there?
Click to expand...
High voltage is all relative. To me, 5v is high; most of what I deal with is 3.3v or 1.8v. Residential guys see 480 as high voltage. Some linesmen don't see it as high until they are at 115kV.
 
n1ist said:
High voltage is all relative. To me, 5v is high; most of what I deal with is 3.3v or 1.8v. Residential guys see 480 as high voltage. Some linesmen don't see it as high until they are at 115kV.
Click to expand...
electrofelon said:
3.3 and 1.8 kv are interesting voltages. What are those used for?
Click to expand...

I think he means just volts and not kilovolts. 3.3V and 1.8V are common DC voltages to power integrated circuits. Over the years the supply voltage for ICs has dropped significantly as device geometries have gotten scaled down in size along the lines of Moore's Law. 0.8 VDC is used in digital ICs, including those in smart phones.
 
synchro said:
I think he means just volts and not kilovolts. 3.3V and 1.8V are common DC voltages to power integrated circuits. Over the years the supply voltage for ICs has dropped significantly as device geometries have gotten scaled down in size along the lines of Moore's Law. 0.8 VDC is used in digital ICs, including those in smart phones.
Click to expand...
Oh, my brain inserted a "k" in there🙃
 
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