Most systems are solidly grounded systems, and this video explains what that means. For a detailed video on system grounding, go here: • NEC System Grounding
silly question but if you cut the grounded conductor ( the wire that runs from the center tap of the utility transformer to the earth) would the breaker still see a ground fault?
A lot of tbe remaining definitions will be lumped together. For example, everything with the word "service," since you really can't talk about one without the other.
To be clear, the transformer secondary winding is solidly grounded. The grounding scheme on the primary does not factor in here. As an aside, I've been doing battle on the internet, trying REALLY hard do get people to STOP calling a single phase, three wire system "split phase". That is a type of motor, for sure, but not a type of service. Someone heard the term, applied it incorrectly by ASSuming, now everyone is just repeating it. It's gotten so bad, that it's all over RUclips, and even manufacturers are erroneously doing it.
Correct, the grounding scheme on the primary has nothing to do with secondary's grounding scheme. As far as split phase goes, that term is used internationally to describe the single phase system we use here.
@@RyanJacksonElectrical Yes, the term has spread like wildfire, unfortunately. "No matter how many people repeat misinformation as fact, it does not make it so". ;) I was just surprised to see it mentioned here. You are very good about nomenclature on your channel, it is quite appreciated. Edison invented the three wire system, using direct current. There's not even a "phase" to "split" with direct current. ;) Likewise with single phase, there's no "phasing", only polarity (albeit instantaneous), just as with direct current...
since the utility ensures the system is grounded, as an inspector, how important is it to bond the neutral/gnd bar in a res pnl? i.e green bolt in service equipment. ...If the xo is grounded in separately derived system, do you need to bond neutral/gnd in pnl here as well?
It is critically important, otherwise the fault current will return through the earth (high impedance, low current) instead of the utility neutral (low impedance, high current). Regarding your second question, you would connect XO to the metal and not bond the panel.
@@RyanJacksonElectrical yeah I feel like I've seen a lot of xfmrs bonded plus pnl/first disconnects but those days are gone I'm turning over a new leaf! Haha About the first question tho, does the utility ever run ssbj with service? If so no mbj, right?
silly question but if you cut the grounded conductor ( the wire that runs from the center tap of the utility transformer to the earth) would the breaker still see a ground fault?
Halo Ryan were do terminate the Isolated ground from the Receptacles on the main panel?
Usually there is an isolated ground bar in the panel that ultimately goes directly to the transformer.
Ryan is the man
Can we get a video on isolated panel…
Yes please
100 Days seems to short.
EDIT: I meant that I would like this series to go for 1000 Days because it's so good.
A lot of tbe remaining definitions will be lumped together. For example, everything with the word "service," since you really can't talk about one without the other.
Appreciate the knowledge.
Great video. Thanks Ryan...
I always wonder how this stuff applies to boats/ships, especially large military and industrial ones.
Chasis.
Screw ups cost money!
🍺🍺🍺🥃🥃🍿🏌🏻♀️
Stay safe.
Retired (werk'n)keyboard super tech. Wear your safety glasses.
Thanks Ryan for breaking down a sometimes confusing topic. 👍
To be clear, the transformer secondary winding is solidly grounded. The grounding scheme on the primary does not factor in here. As an aside, I've been doing battle on the internet, trying REALLY hard do get people to STOP calling a single phase, three wire system "split phase". That is a type of motor, for sure, but not a type of service. Someone heard the term, applied it incorrectly by ASSuming, now everyone is just repeating it. It's gotten so bad, that it's all over RUclips, and even manufacturers are erroneously doing it.
Correct, the grounding scheme on the primary has nothing to do with secondary's grounding scheme. As far as split phase goes, that term is used internationally to describe the single phase system we use here.
@@RyanJacksonElectrical Yes, the term has spread like wildfire, unfortunately. "No matter how many people repeat misinformation as fact, it does not make it so". ;) I was just surprised to see it mentioned here. You are very good about nomenclature on your channel, it is quite appreciated. Edison invented the three wire system, using direct current. There's not even a "phase" to "split" with direct current. ;) Likewise with single phase, there's no "phasing", only polarity (albeit instantaneous), just as with direct current...
I VERY seldom say it.
since the utility ensures the system is grounded, as an inspector, how important is it to bond the neutral/gnd bar in a res pnl? i.e green bolt in service equipment.
...If the xo is grounded in separately derived system, do you need to bond neutral/gnd in pnl here as well?
It is critically important, otherwise the fault current will return through the earth (high impedance, low current) instead of the utility neutral (low impedance, high current).
Regarding your second question, you would connect XO to the metal and not bond the panel.
but it's ok to bond @ pnl for separately derived system?
@@joeballard3027 You do it at the source (like a transformer) or that system's first disconnect. But not both.
@@RyanJacksonElectrical yeah I feel like I've seen a lot of xfmrs bonded plus pnl/first disconnects but those days are gone I'm turning over a new leaf! Haha
About the first question tho, does the utility ever run ssbj with service? If so no mbj, right?
You have an excellent knack for knowing what to cover slowly or repeatedly and what to go past. A natural teacher, Thank you for your efforts here.
Thanks Fred, what a great compliment.