no, it is not feed through, but at the top of the, bus? where the breakers are, there is a hole in each one, is this for an add on lug?
and i will have to carry the common as well, for my 120 circuits, it appears the common carries across the box, where there is another lug,
so it's just a matter of picking up the mains
the ground is no sweat
on the outside of the house, i have a drop that goes into the crawl space with a 90 in the conduit that has a removable cover and a short nipple into the cs, so i could tie in here, but the box would have to be "feed through" and cost is a factor(read:WAY OVER BUDGET INDUCED PISSED WIFE)
what are your recommendations?
man... you already have
alot of breakers in that panel, which tells me your pulling alot in your house.
remember that equation earlier about demand factor?
it also applies to your main panel... and the service entry conductors (wires in from the street that connect to the main 100amp breaker)
residential electrical panels make use of a loophole in the code called the intermittent duty demand factor.
it means that the majority of the ampacity of the main panel is designed to be distributed to branch circuits (the receptacles and lights) throughout the house, based on the assumption that the majority of the devices will not be used for periods longer than 6 hours, and the ones that do, will be low wattage devices.
this allows electrical designers and electricians to cram many breakers into a panel, and this is the case with your panel. if you notice, if you add up the amps of all the branch circuit breakers, you will have a number much higher than the main breaker.
what this means for you, is kind of bad news.
your out of amperage... which means that even though your wanting to run a dedicated line for your grow from the main panel, the power used by the grow
and the power used by your house, must still share the same wires coming in from the street.
if your wanting 80 amps for a grow... then the wires that are currently feeding your main panel, are too small. it would work just fine if the house was empty... but if your occupying the house, your going to be using power, and if your using power in the house, and using power for the grow at the same time, your going to have a problem... you following me?
the correct way to fix this would not be cheap. prolly somewhere around 1.5k. you really need to upgrade the service entry equipment. what i would recommend would be to set a main distribution panel, outside, with a new 200 amp service from the pole, and from that panel you can feed the main panel in the house, and still have your 100 amps for the grow.
sorry to be the bearer of bad news but right now, if you continue on without upgrading theose service entry conductors, your going to have major problems in the very near future.