BIG Al. B
You need to familiarise yourself with some basic electrical concepts. The most important is the current carrying capacity of the house wiring and any cabling or connectors you use to run all your stuff. Current is expressed in Amperes (often abbreviated amps). All devices intended for use with AC mains electricity will be labelled with the amount of current the device will consume or will carry.
The device may also be marked with the power consumption or power carrying capacity, measured in Watts. Power (in Watts) = Current x Voltage. A device that runs on a 240V mains voltage that draws 1 Amp can be said to be using 240 watts. A device running on 120V that draws 2A is also consuming 240W.
House wiring is divided up into several circuits or daisy-chains of power point outlets. Each chain or 'circuit' has its own circuit breaker (or fuse, in very old houses). Circuit breakers disconnect the mains power when the load has exceeded the rating of the breaker. The bedrooms may be on one circuit breaker, the kitchen on another, the laundry on another, the water heater on its own circuit, etc. This is why you have several circuit breakers in your home's breaker box.
I am in Australia, where the AC voltage at household power points is 240V. Much of what I'll discuss will be based on 240V wiring, but it applies also for 120V mains as used in the US, Canada, Mexico, Japan, etc.
Most 120V residential wiring also provide 220 or 240V for high power appliances like electric stoves, water heaters, clothes dryers, etc. The reason for 220/240 service is that when you need to deliver a large amount of power (in watts) to a device, remember that Power = Current x Voltage. When voltage is halved, current must be doubled. If you are running a 1000W load on 240V, it will draw about 4.1A. A 1000W load on 120V will draw 8.2A. Current carrying capacity is dependent upon the diameter of the wires. Thicker wires can carry more current. Thin, smaller gauge wires tend to get warm when you draw too much current through them. However, if you double the voltage, the current is cut by half to deliver the same wattage. Growers in the US may wish to install a 220/240V line from the breaker box into the op and buy lighting to suit that voltage.
In residential house wiring, most of the individual circuits are designed for operating low power devices like lighting and small appliances. The rating for lightly loaded ckts as such is usually somewhere around 8 - 15A. Everything you connect to a ckt adds to the load on that ckt. A 1000W HPS lamp will usually pull about 4.6A on 240V (there's about .5A loss in the ballast, which leaves the ballast as heat). An oscillating fan may draw about 60W, or .25A (250 milliamps, or 250mA) for 240V mains. To determine the load you're placing on a ckt, simply add up all the amperage figures on all the devices you connect.
To avoid overloading a ckt, the load connected must be lower than the rating of the ckt breaker. For best reliability and safety, I recommend that you do not load a ckt to more than 80% of its capacity; in example, don't put more than an 8A load on a 10A ckt. This assures that the wiring and connectors will run cool and thus with a high margin of safety.
Bear in mind that some devices like HPS lighting have a very high current draw on startup but then settle back to a lower current draw once warmed up. A 1000W HPS may pull 6.5A when striking the arc and warming up but then will fall back to about 4.6A. For this reason, you could not put two 1000s on a single 10A ckt, even though their combined running current (9.2A) would be less than 10A. Even if you stagger the start times by about 5 mins, if one lamp is warmed up and running at 4.6A, when the other lamp starts, it may be pulling 6.5- the combined draw from both lamps, one running, one starting, will be about 11.1A- which will likely trip the 10A breaker.
Use of extension cords is not a good idea with high-power devices like lighting due to the highly variable quality of the connectors and assembly work. A lot of cheap Chinese extension leads, despite carrying UL or other safety certification insignia, are poorly made and use substandard connectors. If you must use an extension cord for high power devices, it's best to buy heavy-duty plugs & sockets and assemble them yourself to cable of known quality and wire gauge.
For the greatest degree of safety, run a dedicated cable from your breaker box to the op. Install a breaker specifically for the op. Use standard flexible house wiring cable, often called Romex. Make a power distribution board with high-quality power point outlets mounted on a plywood panel, which you can hang high above the floor, away from any potential water splash areas. Keep all cabling off the floor.
Surge suppressors are not generally useful in a grow op. They're good for protecting sensitive low power electronics from line surges, but the stuff you'll use in a grow op is not normally susceptible to damage from line surges. However, Ground Fault Circuit Interrupters or GFCIs, do have a purpose in grow ops. GFCIs detect current leaking into the ground lead- this can be caused by water intrusion into a device or wiring or by an insulation fault. GFCIs will cut current flow to a device if an unsafe condition is detected.
Don2009
Hey Al iM not a big social person even on the internet. But when I first came to RIU I went to the forums section just off of instant and I knew I wanted to do hydro and I went straight to your thread harvest every 2 week and I immediatly started reading non stop very profound shit bro. Then I was so excited you seem like a celebrity to me, I was like dame I wish I could of been around when you was, just to think of a question to get an answer. lol 4 real. An d I almost got a lecture from you on this post WOW! Thanks bro But I really needed the info not just some Q&A shit. Anyway Al can you refer me to some electrical litature so I can learn the basics to get my issue solved the way you learn? Im really stressing this shit now I did not expect this much $$$$$$$$ and complex knowledge. Espically with electrical everytime I say this is it with spending $$$$ theres another important issue. I spend almost 4-5k just to get my bull shit yields trying to get to your yield and op going now electrical. Is there any thing else vital I have to worry about? Can you do a thread about your thoughts on electrical and the price on getting your op going exactly the way you going now? Thanks bro your a scientist.