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For questions about an [electrical-panel] that is fed from another [electrical-panel] instead of being fed directly by a utility service or separately derived service (such as a generator or inverter).

3 votes

100 Amp Shed Workshop from 200 Amp House Panel 120' Direct Bury Cable

First, a few general thoughts: You'll need four conductors, not three. Two hots, neutral, and a separate ground. Also need to add a grounding electrode system at the outbuilding. (two ground rods, co …
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1 vote

Can a panel ground enter through the same opening as the power cables?

IMHO the conductor should have a clamp to provide strain relief where it enters the subpanel just as would be done for any cable (ie conductors/cable not inside conduit). …
Greg Hill's user avatar
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2 votes

Best way to feed my planned 240V subpanel down 150' of stairs?

So far as shaping PVC is concerned, yes there are means other than buying lots of pre-made elbows. You can bend PVC in the field. Several methods use heat; another is done cold. The conduit path need …
Greg Hill's user avatar
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1 vote

How to wire subpanel back to back for portable generator

An alternative is to move the A/C and oven breakers into the existing subpanel. … If this existing subpanel is rated for more current you could choose the 150 or 200A main breaker for it, upgrade the feeder wiring to the meter panel, and put a larger breaker in the meter panel just …
Greg Hill's user avatar
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1 vote

subpanel breaker tripped as well as main breaker - should I be concerned?

Due to there being two sources of power it's difficult to say exactly what happened. Here are a couple of possible scenarios: 50A breaker tripped, cutting power to panel. Generator started, transfer …
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1 vote
Accepted

Which wire size and conduit for a 200A subpanel?

When sizing a subpanel feeder for a one- or two-family dwelling under NEC rules, after all the load calculations are done, there's another question that must be answered. … It is this: does that subpanel serve the entire load associated with the dwelling? …
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3 votes

Installing a new meter and main panel to home during addition

Some panels have feed-through lugs which can be used to carry power to an indoor subpanel; this might or might not be beneficial in your scenario. … If you put your new panel beside the old one (or in an entirely new place) then you can set it up as a subpanel off the existing main, move circuits and feeders to the new panel at your leisure, and really …
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0 votes

backup electrical feed to main panel from inverter's GFCI outlet without ground?

Does the ground terminal on the inverter connect to anything else.. the inverter (and car) chassis, for example? If it does, and if the ground wire from the inverter to the main panel is not connected …
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3 votes

Connect generator to main panel

This can also give you spaces for grid-tie solar, vehicle charging, an additional subpanel in the house, and so on. …
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0 votes

Where do I attach the Ground and Neutral inside a sub-panel?

In your main panel there's a fat bus bar down the left side. It has a lug up high and another at the bottom (hidden from view behind some wires). Those lugs should accommodate your neutral and ground …
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15 votes

Can I use a 125A panel with a breaker and wiring sized for 90A?

Feeders are basically just a branch circuit that feeds other sub-branch circuits (via a subpanel). … At the end of the load calculation section, highlight the fact that the minimum subpanel and feeder ampacity are X amps. Second, show feeder conductor sizing calculations. …
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7 votes
Accepted

Bypassing an inverter using manually operated switch

You want to, with switches, have the option to electrically eliminate the inverter so that the subpanel powers directly from the main panel. Correct? … This allows selecting the source of power coming into the subpanel and provides a fool-proof way of preventing shorting around the inverter. …
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