What's new
  • Happy Birthday ICMag! Been 20 years since Gypsy Nirvana created the forum! We are celebrating with a 4/20 Giveaway and by launching a new Patreon tier called "420club". You can read more here.
  • Important notice: ICMag's T.O.U. has been updated. Please review it here. For your convenience, it is also available in the main forum menu, under 'Quick Links"!

Growroom Electricity and Wiring

Danknuggler

Active member
OK Ok, so 10/2 throughout no prob.You guys seem to think its going be tough to wire all that in the gang box using that ga wire?I'm going to try.I'll post it up here when I build it maybe then someone can make sure I did it correct.Thanks for all the help again fellas.:joint:
 

madpenguin

Member
A quad gang box has AMPLE room. One 10/2 coming in with a total of 12 pig tails and 4 blue wirenuts .... Sure. It's going to be tight. That's why you stuff your wires to the back of the box. It won't be over cubed, I can almost guarantee that. Remeber grounds count as one and you will have no internal clamps.
 

Danknuggler

Active member
picture.php


Looks pretty easy to me. 10/2 with ground on a 30A double pole breaker in your main panel. Put a black piece of tape around the white wire that attaches to the 30A breaker. Both black and white wires will attach to the 30A DP breaker in the main panel. Attach the bare ground wire to the neutral/grounding bus terminal in the main panel.

If you have exposed joists in the basement, use a 3/4" auger bit to drill thru the joists. Drill right through the center of the joist with relation to top and bottom. Also, try to stay near a concrete wall. Try not to drill through the middle third span wise of a joist if that makes sense. These holes are to fish your 10/2 with ground through. Buy a piece of grey electrical conduit at Home Depot. Once you want to take the 10/2 down the side of the basement concrete wall, attach the grey electrical conduit to the wall with masonry screws and 1/2" pipe clamps to secure the electrical conduit. Just push your 10/2 down the conduit until it comes out the bottom. Looks like there is a knockout on the side of the timer. Buy a white plumbing elbow or something to mate with the electrical conduit so you can run the 10/2 into the timer so no cable is exposed. Mount the timer to the concrete wall with masonry screws as well.

With me so far? Everything securely fastened.... Take your incoming black wire and attach it to terminal 1. Take your incoming white wire and attach it to terminal 3. Take the incoming bare wire and attach it to the ground screw. Put a piece of black electrical tape arond the white wire in the timer box.

Buy some MC cable that has 10/2 with ground. Run it out of another knockout in the timer box. The green sheathed wire attaches to the grounding screw. The black wire attaches to terminal 2. The white wire (put a piece of black tape around it) attaches to terminal 4.

Take this length of 10/2 MC (Metal Clad) cable and run it how ever far you need to get it to where you want your receptacles. Buy a quad gang box.
picture.php


Try to use the metal ones. Take the MC cable through one of the middle knockouts. Unless your really skilled with a hack saw, you'll want to buy some MC cable cutters.

picture.php


The roll of MC you bought should come with redheads (anti-short bushings). Cut enoungh of the jacket off the MC so you have atleast a foot of conductors sticking in the quad metal box. Use a metal NM connector to securely fasten the MC cable to the metal box.

picture.php


So once you install the redhead into your freshly cut MC cable (to protect the inside conductors from getting damaged on the rough cut edges of your MC outer sheathing, tighten down the NM connector until the MC cable is held securely in place.

Now you have about 12" of green, black and white conductors in the quad metal box with about 3/8" of MC cable jacket entering the box. Get a green grounding screw. These can be had at Lowes or Home depot as well.

picture.php


Strip atleast 6 inches of the green insulation off until your left with bare copper conductor. Find a hole in the quad metal box that one of those green grounding screws fit into. Start threading it just a couple turns so it stays. Take your stripped green insulated conductor and wrap it around the grounding screw paying close attention that when you tighten the grounding screw down all the way, it will pull the bare conductor tight and not squeeze it out. Once the green grounding screw is really torqued down, You should have bought atleast 4 grounding leads from Home depot or lowes as well.

picture.php


Actually, forget about buying the grounding screws separate because we can use the ones that come with the pigtails. bare Whatever few inch piece of copper is left from when you tightened down the grounding screw, take a pair of linemans pliers and mechanically twist all the grounds together. Then wirenut 4 of the above grounding pigtails to the bare copper conductor that is attached to the back of your box. You'll need the big blue wirenuts for this. When your using linemans pliers to mechanically twist wire together, use very little force at first. Kind of let the wire slip through the plier heads. With each turn of the wrist, put more pressure on the bare copper wire that your trying to twist. You will eventually get all of the ends of wires to line up with each other and it will look like(and be) a really nice electrical connection. If you just really clamp down on all the wires at once and then twist really hard, wires will slip out and it'll look like shit and you'll have to do it over again. Sounds silly but there actually is a correct way to twist wires together. You'll figure it out.

Cut about a foot piece off of any left over 10/2 with ground romex and get the black and white conductors out of it. Put black pieces of tape around 4 white wires and then you should also have 4 black wires. Wire nut all the blacks together (including your incoming black lead from the timer box). Do the same with the white wires but make sure each white wire has a piece of black electrical tape around it.

Now you have 4 black wires, 4 white wires and 4 green wires inside your quad gang metal box.

Need I continue?

These are 240v receptacles. Put a black on one side and a white on the other and then a green on the grounding screw of the receptacle. Do that for all 4 receptacles, then find a metal box cover that will work with your receptacles. If there are any plastic round or square thing-a-ma-bobs holding the mounting screw for the receptacle in place, remove those. You want metal on metal contack with the yoke(strap) of the receptacle to the metal of the box.

The stuff I highlighted I still dont understand.
 

Danknuggler

Active member
A quad gang box has AMPLE room. One 10/2 coming in with a total of 12 pig tails and 4 blue wirenuts .... Sure. It's going to be tight. That's why you stuff your wires to the back of the box. It won't be over cubed, I can almost guarantee that. Remeber grounds count as one and you will have no internal clamps.

Again you lost me here.over cubed?grounds count as 1 what?internal clamps what is that exactly?
 

madpenguin

Member
Ugh.... Being Overcubed is an electrician's term which means you have too many wires inside a gang box. You are only allowed to put X amount of wires in any given gang box because of heat related issues. There needs to be surrounding air around the wires so they can dissipate heat, thereby not damage the individual conductor insulation.

picture.php


picture.php


picture.php


Look at table 314.16(A). If I'm not mistaken (I very well could be), the last "device" box you see (4 x 2 1/8 x 2 1/8) is probably a handy box. Looks just like the 4 gang one I posted earlier only it accepts ONE device. A handy box is typically what you would masonry screw to your basement wall for a light switch or receptacle box.

So.... If we are going by those dimensions for just one gang, look to the right in that column and you can see what amount of wires in cubic inches it can hold safely, which is 14.5 in. If you even look further to the right, it flat out states that it can safely hold 5 #10awg conductors.

We are using a 4 gang box. The only dimension that has changed is the length of the box. Therefore we can safely say that we have 58 cubic inches to work with and we can have 20 #10awg conductors in there without being illegal.

Here are some rules when calculating box fill:

1.) Each device counts as 2 conductors
2.) All grounding wires just count as one conductor
3.) All internal clamps (ones that come with the box) count as one conductor

Ok. You want 4 6-30R's in there. That counts for 10. 2.5 cubic inches a piece. All ground wires count as one, so add another 2.5 cubic inches. Now we have a total of 12.5 cubic inches so far. We have no internal clamps because we will be using an external NM or set screw clamp so we don't have to worry about that.

Receptacles= 4x2.5 = 10 cubic inches
Grounds = 1x2.5 = 2.5 cubic inches
Incoming hot conductors= 2x2.5 = 5 cubic inches

Total box fill = 17.5 cubic inches

You've got 11 #10awg conductors there (2 incoming hot, 1 incoming ground and 8 hot pigtails). Look at table 314.16(B). Each #10 counts as 2.5 cubic inches.Pigtails and wirenuts do not count towards your box fill as per 314.16(B)(1).
NEC 2008 Article 314.16(B)(1) said:
A conductor, no part of which leaves the box, shall not be counted.
I think that's pretty stupid because that 4 gang box is going to be really tight with all those pigtails, but.... whatever.

Even if we counted up ALL the conductors, incoming and internal only(pigtails), that leaves us with 27.5 cubic inches just for the wire. Add another 10 cubic inches for the receptacles and that gives us a grand total of 37.5 cubic inches. We are still good.
 
Last edited:

madpenguin

Member
The stuff I highlighted I still dont understand.


Madpenguin said:
Whatever few inch piece of copper is left from when you tightened down the grounding screw, take a pair of linemans pliers and mechanically twist all the grounds together. Then wirenut 4 of the above grounding pigtails to the bare copper conductor that is attached to the back of your box.

When ever you use a metal box, it MUST be grounded per 314.4 which I listed one post back. I told you to use MC cable. Use whatever you want. But if you use MC cable, your grounding conductor will not be bare copper but have a green sheath around it. You need to use that wire and ground it to the back of the box as soon as it enters the metal box. The only way you can do that is to strip off a piece of the green sheath so you can have bare copper on the metal box.

This is really all I could find on the internet: This is what your supposed to do with your incoming grounding conductor when using a metal box:
picture.php


Now if you were using type MC cable, as per my example, inbetween the grounding screw that fastens to the box and where the cable enters the box, it would have a green sheath. After the grounding screw, you would strip the rest of the green sheath off and use the rest of that piece to pigtail to your 4 green sheathed gounding leads (the ones I posted earlier).


Madpenguin said:
Cut about a foot piece off of any left over 10/2 with ground romex and get the black and white conductors out of it. Put black pieces of tape around 4 white wires and then you should also have 4 black wires. Wire nut all the blacks together (including your incoming black lead from the timer box). Do the same with the white wires but make sure each white wire has a piece of black electrical tape around it.
You need to make some pigtails.Plain and simple. Take a foot long piece of 10/2 romex and cut it in half. Remove the outer orange sheathing. You should have 2 white conductors, 2 black conductors and 2 bare copper conductors.

Do the same thing again with a new piece of 10/2 romex. Now you have 4 black conductors and 4 white conductors. Each piece is 6" long. Those are your pigtails. Those are what you will wirenut to your incoming feed for the metal box that will hold your receptacles. Wirenut all 4 black pigtails to the incoming hot black conductor. Each one of those 4 black pigtails will attach to one side of your 6-30R receptacles.

Do the same thing to the white conductors. Only put a piece of black tape around each one so as to identify them as hot conductors. Pigtail all the whites together with a large blue wirenut and connect each of the 4 pigtails to the other side of the receptacles.

This is all just basic wiring man. Go down to Lowes or home depot and buy one of those Black and Decker home wiring books. Read it. Books like that will teach you the basics. You need a basic understanding of general wiring practices before you go messing around with this stuff.
 

Danknuggler

Active member
Actually that was exactly what I needed MP.Perfect.Now I can do it no prob.There was a couple minor details about how to go about it in your first explanation that I couldnt wrap my brain around but no I got it all.Thanks alot!!!nuggler
 

cocktail frank

Ubiquitous
Mentor
ICMag Donor
Veteran
MP, i know the NEC like the back of my hand, thats my job.
im fully licensed, business permit and working.
i got a handful of guys that work for me, been doing this along time.

but i'll be honest w/ you.
you sound more like an EE than an "on the job" sparky IMO.
i'm still gonna stick w/ what i said.
he will have 1 240v single receptacle (being duplex are about as tough to get as a despod anymore) per pigtail.
no way he is gonna have a 30a draw on that.
only way it will happen, is if there is a dead short.
it will be for a millisecond, and top out at w/e AIC the branch circuit breaker has.
being most likely a residential joint, i'd say no more than 10k AIC.

that is pretty much the only thing i could see happening that would justify a draw over the 5a he will have plugged into it.
unless the OP does something crazy (like make a plug/box setup/ splitter) it will never be a problem imo.
just like the nema r-30's, redundant imo.

i'm not saying you dont know your shit, its apparent with your posts.
i could sit here and quote the nec, nfpa or my law books for you all day if you want,
i'm just trying to be practical.
 

madpenguin

Member
It's not that I don't see your point. Yes, each receptacle will probably never see more than what the ballast draws nor will the pigtails that feed them. I'm most certainly not an electrical engineer. I'm a field residential electrician. The NEC is scripture and I take it very seriously. Why you don't is a little confusing to me. If your licensed and insured but advocate your said practices on your own jobs........ Man. Your a law suit waiting to happen.

If you use a 30A OCPD, you MUST MUST MUST MUST MUST use 30A rated cable the whole way along with 30A rated receptacles. Atleast if you want to stay 100% safe you "must".

Read my sig. I will not violate the NEC under any circumstance. Well, almost any circumstance. I have my lamp cords running through drywall that I then spackled up because I didn't want the extra heat in my room. Yep. That's a violation with flexible cord. I did it anyway. What I've done and what you propose are 2 completely different things and differ significantly in degree of danger posed.

It's up to the OP what he wants to use as far as wire guage. I'm stating what is required as a "minimum safety standard". I'm tired of saying that phrase because people just aren't getting that that's what the NEC is all about. It's a guideline for Minimum safety standards. When you don't even meet the minimum, wow.... your asking for trouble. :2cents:
 

madpenguin

Member
Hi MADPENGUIN may i use s.s.r.(solid state relay )instead of using mecanical one for switching HPS.
In 120 volt i know i have to open the hot wire (black)but with 240v 2 hot wire do i need 2 s.s.r. ? S.S.R. will be rated at 40 amp at 240v. with cooler . i will drive 2 1000 watts ballast.


You got lost in the shuffle. Sorry. As long as it's a double pole and disconnects both hots when off, then sure. While killing one hot will turn off a 240v device, as well as some electricians around here saying that it doesn't matter if only one leg is dead, You will be in violation of the NEC unless both hot conductors are killed at the same time.

This is like people using single pole T-stats on 240v baseboard heaters. Extremely freaking stupid and a good way to kill someone while servicing said equipment. Yea, unless the t-stat can be locked in the "off" position, you can't technically consider it as a disconnecting means but a little common sense is called for. If you have a 240v device, what ever controls said device should kill both hot conductors for personal safety reasons.

Not too sure I'd trust thos SSR's anyway..... I think they are way more prone to failure than a mechanical one. That's just my opinion tho...
 

overbudjet

Active member
Veteran
What a failure can do ?Set fire or the component just don't work. And what load the s.s.r. will see if they will light 2 1000 watts
P=V*I 2000 watts /240 volts suppose to be around 8 amp ? Does this load will split in the 2 hot wire ,meaning by that, each s.s.r. will see around 4 amp load att 240 volts
 

-.black.-

Member
I'm glad to see this as a sticky, cuz i could really ask some questions here. I'm in the middle of building a room. And in my room I have 2x 400 watt HPS. 2x 150w(650 eqv) CFL. 1x 175 watt MH. Now right now the only outlet I have in my room. Is a single 120v outlet. That runs all the way from the top of the house to the basement. Where the fusebox is. I live in an older house and it hasn't been updated to breaker boxes but anyway. I was thinking about upgrading to a 240v line. That way i can decrease my amperage and always the risk off blowing a fuse downstairs. Now the only problem with that is. The highest fuses we have are 15 amps. So that's not including what we have running in the house(televisions, lights, etc.) So a 240v line is a must if I plan to expand. But the only problem is, I have no way of running a 240v line from the basement to the attic. So now to my question. Has anyone ever heard of or seen these.

I was wondering how well these work and if they are safe. I'll be taking a cord from my 120v outlet that I described earlier and plugging it into this. From there it will be split up to my lights. It says it is rated at 3000 watts and 30 amps. And from my calculations should be within my range. Even if I decided to upgrade and add more lights.

It just seems like a better idea to upgrade to a 240volt power source, and I was wondering if this is a viable way to do so. I'd greatly appreciate the input. Cuz any other way I would be fucked.
 

madpenguin

Member
What a failure can do ?Set fire or the component just don't work.

Both.
And what load the s.s.r. will see if they will light 2 1000 watts
P=V*I 2000 watts /240 volts suppose to be around 8 amp ?

Always look for a steel plate or sticker on your ballast that states the amperage and voltage. Using Ohms Law will give you an approximation but when calculating loads you never want an approximate amp value. Just a tiny amperage difference could mean the difference between using one gauge of wire versus another.

Does this load will split in the 2 hot wire ,meaning by that, each s.s.r. will see around 4 amp load att 240 volts

Go back a few pages and There is an in-depth explanation of how 240v works when using 2 hot legs @ 120v each. It was the MultiWire Branch Circuit post which is a little different than a straight up 240 but semi close. If I'm not mistaken, I even direct copied/pasted from another site as well as giving a link to said site. In a nut shell each wire will see 8A. The load will not be split across both wires. AC current is "alternating" so it goes back and forth from the power supply to the load 60 times a second (60 hz).
 

madpenguin

Member
I'm in the middle of building a room. And in my room I have 2x 400 watt HPS. 2x 150w(650 eqv) CFL. 1x 175 watt MH. Now right now the only outlet I have in my room. Is a single 120v outlet.

That entire circuit is just about maxed out. Please don't add anything else as I'm sure you already know this and have indicated that your not going to put anything else on it. ;) Not only will that circuit being seeing the load of all your equipment but any other receptacles in your house that are on the same circuit will be putting additional draw on that old wiring.

That runs all the way from the top of the house to the basement. Where the fusebox is. I live in an older house and it hasn't been updated to breaker boxes but anyway.
Same deal with my place. That is, until I replaced the old 1913 Square D fuse box with a new 100A siemens loadcenter. You need to be extra carefull with your setup and I need to be extra carefull giving you advice. I need pics.

1.) Is there a main disconnect on the outside of the building right after the meter?
2.) Do you just have one fuse box in the basement or does your incoming feeder cable go to a lever disconnect box and then straight into your fuse box?

I was thinking about upgrading to a 240v line. That way i can decrease my amperage and always the risk off blowing a fuse downstairs. Now the only problem with that is. The highest fuses we have are 15 amps. So that's not including what we have running in the house(televisions, lights, etc.) So a 240v line is a must if I plan to expand. But the only problem is, I have no way of running a 240v line from the basement to the attic.
Yea... I can almost guarantee your incoming feeder from the meter is probably only rated to handle 60A. Not only that, if you live in a house that has been divided into 4 units or even a duplex, your incoming feeder conductors could be run inside metal conduit along with your neighbors.

Let me elaborate my concerns by explaining my situation. I live in an old house that is split up into 4 units. All the wiring in the house is old school Knob & Tube (as is yours) and all 4 units feeder conductors are crammed into a single conduit which leads to a common area in the basement. The conductors feeding each panel is 6 gauge copper. That's 2 hots for each unit for a total of 8 hot conductors. But..... There is only one neutral wire in the conduit. This conduit is maybe 2 inches or so. The conduit dumps out into a cutout box with a terminal. The main neutral coming from the quad meter pack terminates to this bussbar and then 4 separate conductors were also terminated to this bussbar. Each one feeds a separate panel for it's neutral.

When I moved in, I convinced the landlord to let me do some work because it was extremely unsafe with the existing setup. The other 3 units had new loadcenters but the apartment I moved into still used the existing 1913 square D fuse box and separate disconnect. I yanked it so all 4 units were on new panels that used breakers. I also derated the main breaker for each panel down to 50A because of the over crowded conduit situation. Not only that, I had to balance each panel out so each panels neutral conductor would have as little returning current as possible. Because, remember, all 4 panels neutrals meet up at a cutout box and all the returning current for the entire house goes down one neutral back to the meter and then up to the pole mounted transformer.

I probably lost you there. The point I'm trying to get across is...... Is that an electrician really needs to be on site and examine your entire wiring system from meter to panels to see what's going on.

I never got my landlord to spring for a full blown service upgrade so all 4 units here are still using one neutral wire. The terminal bar in the cutout box is blackened from having too much current coming back on the neutral. Scary shit. Can't wait to move actually.

So now to my question. Has anyone ever heard of or seen these.
I was wondering how well these work and if they are safe. I'll be taking a cord from my 120v outlet that I described earlier and plugging it into this. From there it will be split up to my lights. It says it is rated at 3000 watts and 30 amps. And from my calculations should be within my range. Even if I decided to upgrade and add more lights.
Don't do it. Not only will that thing probably put out a shitty sine wave but your still using ancient tinned copper Knob & Tube wiring.

It just seems like a better idea to upgrade to a 240volt power source
It is. First thing is first. Need lots of pictures. Also, there is always a way to run a new line from the basement to the attic. Check where the bathtub plumbing goes up. A drop chain works well. The space that my plumbing is in is so large that I can almost open my access hatch to the bathtub plumbing and shimmy my way down into my neighbors section of the basement. It should also go straight up into an attic crawl space if your lucky.

See.... So not only would I basically need to be on site to examine your electrical system but I'd have to crawl around and find a way to fish a new line (which I guarantee can be done).

More than likely, you would have to double tap your incoming feeder lugs to fire up a very small sub panel(which can be unsafe if the lugs are not rated for more than one wire). Like a dryer disconnect box or something. A small subpanel that only has 2 slots. ie - For a 20A double pole breaker. You really need brand new romex running to your room along with it being properly fused with an actual breaker.

pics, pics, pics...... The more the better. We are really treading on thin ice with this post. Please don't do anything on your own until we have figured out everything going on with your wiring. Pretty much all your options are going to entail working with hot and unfused feeder conductors. One wrong move and your toast. Hopefully, you have an outside disconnect that will kill your entire panel. If thats the case then you are golden. Will take some cash and following explicit instructions given here, but as long as you can entirely de-energize your panel, it's fairly simple to yank all that shit out and replace it with a new loadcenter with breakers. But, you really need to know what your doing if taking that route.
 

overbudjet

Active member
Veteran
Thank MADPENGUIN for your great advise i will take some pics tonight about those s.s.r. Does the risk of settint fire will be smaller if the s.s.r. only activate coil of a mecanical relay
 

-.black.-

Member
Alright mad penguin. I'm hoping you visit this thread often. Cuz I will def. be back with more questions lol. I can't thank you enough for caring enough to take the time to help. If you can tell me what you needs pic of then i can go and take pics and get back to you. Or if you want to send me a PM, that would be great. I hate to be a pain. But i'm probably going to have ALOT of questions. I have no idea how electricity works, and how everything should be wired. Now i'm kinda scared, cuz the last thing I want to do is start a fire. But I was told by someone who is helping me. That they had an electrician come in and look at it. And i'm not exactly sure what he said he could do. But I will find out and let you know. But if you wanna tell me what to takes picture off, and how to find out what you want to know then i'd be glad to help you, help me.
 

madpenguin

Member
Thank MADPENGUIN for your great advise i will take some pics tonight about those s.s.r. Does the risk of settint fire will be smaller if the s.s.r. only activate coil of a mecanical relay

Why would you do that tho? Isn't that kind of like cracking an egg into a frying pan but then puting the frying pan into the oven?

I'm not gettin' ya. Just use a regular relay... Or try the SSR's. Just enclose them in a small steel box like a gutted AC disconnect box or something. If they are indeed as cheap as they seem, if they catch fire then so what. They are in an enclosed steel box with no openings. Let em' burn.
 

madpenguin

Member
Knob & Tube Wiring

Knob & Tube Wiring

Alright mad penguin. I'm hoping you visit this thread often. Cuz I will def. be back with more questions lol. I can't thank you enough for caring enough to take the time to help. If you can tell me what you needs pic of then i can go and take pics and get back to you. Or if you want to send me a PM, that would be great. I hate to be a pain. But i'm probably going to have ALOT of questions. I have no idea how electricity works, and how everything should be wired. Now i'm kinda scared, cuz the last thing I want to do is start a fire. But I was told by someone who is helping me. That they had an electrician come in and look at it. And i'm not exactly sure what he said he could do. But I will find out and let you know. But if you wanna tell me what to takes picture off, and how to find out what you want to know then i'd be glad to help you, help me.

Eh.... You really need an electrician out. You've probably only got 2 or 3 circuits max in your fuse box I'm assuming. I had 2 for my part of the house. They didn't use too much back in the day. Light fixtures and a radio was about all you had so 2 circuits was more than enough.

My main concern is that your using existing Knob & Tube wiring. It's actually a pretty good wiring system but it has a couple draw backs.

1.) The hot and neutral are not ran together so you'll get some inductive heating. Not too much of a problem because the 2 wires are atleast a foot apart and they are "free air" run. What happens is, that someone comes along much later and blows in insulation covering all that K&T.... You have to run K&T completely free air to disperse heat generated by the wire. In modern day cable, the hot and neutral are ran together and the magnetic fields cancel each other out, thus you get no heating of the wire besides what the actual load is creating.

2.) As microwaves, toasters and all sorts of fancy gadgets were being invented in the 40's and 50's, the demand for more power was greater than what the homes wiring system could handle. People started constantly blowing 15A fuses, so they would put a 20A fuse in there. Blow a 20A fuse? Hell, just throw a 30A fuse in there... Why not? Well, the wire is only rated to handle 15A. If you push 25A down 15A rated K&T year after year, the insulation gets so brittle that it completely falls off. I've found huge sections of bare wire behind walls before. What's really bad is when people would just stick a penny in the fuse socket and then screw the blown 15A fuse back in. Now there is no limit as to how much load the wire will see.

So anyway..... You really shouldn't be using any of your old wiring for your grow. Not if you want piece of mind.

If you still want to take pics then I need outside meter pics. Outside main disconnect pics. Inside disconnect pics. Inside fuse box pics. Everything man. From meter to fuse box, I would need to see it all in detail, other wise there is not much advice I can give. This is why an electrician should really be on site.
 

overbudjet

Active member
Veteran
Why would you do that tho? Isn't that kind of like cracking an egg into a frying pan but then puting the frying pan into the oven?

I'm not gettin' ya. Just use a regular relay... Or try the SSR's. Just enclose them in a small steel box like a gutted AC disconnect box or something. If they are indeed as cheap as they seem, if they catch fire then so what. They are in an enclosed steel box with no openings. Let em' burn.

i want to do that because i want use computer to control to my new growroom and computer only give 5 volt output http://www.growtronix.com/store/index.php?main_page=product_info&cPath=3&products_id=16
 

madpenguin

Member
Ah... Makes sense now. Yea. Give it a try. Mount everything in a steel electrical enclosure tho. Make sure all openings are closed. That link even said you might have to use a heat sink because they get so hot. Maybe some Arctic Silver compound and a high grade computer heat sink would be necessary considering the load you want to switch.

Or if you went the SSR --> Mechanical route maybe the SSR wouldn't have that problem. I'm interested now. Let me know how it turns out.
 

Latest posts

Latest posts

Top