100A sub-panel for my tools

Adding a 100A sub-panel for my tablesaw, planer, molder and other bit tools

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[namanda1234]

What's your primary panel rated for 100 amps or 200 amps? you are adding 100amps breaker to the primary panel to feed the 200 amps sub-panel. These two panel are now in series. Wound this overload the primary panel @ max peak power consuption and therefore trigger the main breaker?

[DarlingtonFarm]

@namanda1234 The primary panel is 100Amps now, my plan is to switch it out for a 400Amp and feed the 200Amp sub from that when I get the time. (want to be able to lock out all my tools with one switch/ breaker) I plan to wire in a rotary phase converter off the new 400 service to supply 3phase tools. So yes you could overload the 100A main breaker but so far I have not been able to do this with pretty much everything turned on + a 7.5KW heater.

[RandallFlaggNY]

DF could end up on the Darwin Award list....

[DarlingtonFarm]

@RandallFlaggNY I don't bother turning off single phase panels unless I'm doing something major. Now 3 phase or high voltage DC is a different story.

[roberthiner]

you might want to isolate the neutrals from the grounds.as per 250.24 (a)(1)-(a)(5). (a)(5) Load-side Grounding:.A grounded circuit conductor shall not be connected to normally non-current-carrying metal parts of equipment,to equipment grounding conductor(s),or be reconnected to ground on the load side of the service disconnecting means.

[DarlingtonFarm]

@roberthiner thanks, had not removed the jumper when I took the video

[butopiatoo]

what a dumbass. you never work with the buss live. is this guy still alive and breeding?

[kabrightbill]

Do you know what a cardiac defibrilator does? If not it restarts the Electrical pulses from your heart. Well, sir this also works in reverse. Turn off the the power, if you know it dumb you know it will KILL you.

[butopiatoo]

@zzpianoman

The local wires company marks their Meter (dual read shows power used and power into the grid) "Grid -tied Generator" and the Disconnect is also marked "Grid-tied Generator. The inverters only generate AC power when connected to the Utility Grid and if the Utility Grid goes down, the inverters stop converting DC from the Solar Panels to AC power and once Utility Grid power is restored, the inverters do not start producing AC power for 5 minutes.

[butopiatoo]

@zzpianoman Well, it is an accurate description. By definition, grid-tied generation (in this case solar panels) backfeed the grid. Utility Grid > Meter < Main Panel < Disconnect < PV Production Meter < Solar Breaker Panel < Solar Arrays (Microinverters < Solar Panels < The Sun

[zzpianoman]

It would be interesting to see the result of shorting out a 100 amp service panel. I thought those main breakers were only designed to trip only once from a dead short.....and the cost of replacing the main breaker would probably exceed the cost of replacing the entire panel not to mention the damage to the panel itself.

[zzpianoman]

@butopiatoo backfed is not a good term to be using when talking about service mains.

[butopiatoo]

@zzpianoman yep, I will say this video was helpful in getting my work done. I've completed the install of a 200amp main panel that is back fed from another 125amp subpanel. the subpanel receives two 240 volt 15 amp circuits (one for each of two arrays). Looking at this was helpful in thinking through what to do and how to do it, though I ultimately had a licensed electrician do the final wiring. Very happy with the results. I need to post pictures of what we did so others can see the set up.

[zzpianoman]

@butopiatoo Agreed. If it is feasible to turn off he power, ALWAYS TURN IT OFF. It's bad enough that the two phase lugs are always hot even with the main breaker in the off position - but exposed bus bars? especially so close to that heavy SER wire which you will obviously have to wrestle into place. What if it slips and hits one of the bus bars? Happy 4th of July!