HOME LAB AC POWER QUESTION 1

[maczen]

OK.. I know that I post a lot... Sorry, will try to keep the questions to a minimum.. If it's any help then know that I have been configuring the heck out of my lab and work through all of the problems... (mostly) LoL... Had an issue that took about 45 minutes earlier.. (Forgot to set clock rate on DCE when configuring PPP with CHAP)! LoL Incidentally the message you get is very cryptic.. PPP Authentication Required!! How that relates to missing clocking is beyond me.. LoL

OK.. My question...
Is there any instruction as to how many routers/switches to connect to one electrical outlet? I currently have my lab near one outlet and have two power strips plugged into that outlet.. I currently have 13 devices..
4x 3640
3x 2600
1x 2950
4x 2924
1x 2511

On the rare occasion that I want to run it all at once can I use just this one outlet or should I run an extension cord from another.. Have not tried it yet but don't want to fry this stuff or start a fire.. LoL

Is there a way to determine how much power is needed and therefore how many can be plugged "safely" into one outlet? I have run 3 at once and that will usually be the max but like I said I may want to run more every once in a while...

Thanks again guys!

 

[burtsbees]

The UL (Underwriter's Laboratory) is responsible for rating output currents, breaker limits, etc. The max is rated at 75% of the total capacity...if a device pulls 12 amps, then a 15amp circuit will not do---surges could cause an overhead of 4 amps, bringing the max to 16amp, which would cause a 15amp breaker to pop---in case of breaker failure and idiots who use plastic gang boxes, it would cause a fire. So---add up the total output current (not voltage!), and if you have a 20amp circuit and the total does not exceed 15amps, you're in good shape. In Watts (power), remember that currentXvoltage=power (measured in Watts)---they always list input and output voltage---you want output. Say 12VDC output, at 60 Watts---that would be 720 miliamps (I think), =.72 amps.

Burt

 

[maczen]

Awesome.. Thanks again Burt!

 

[maczen]

Hey Burt,
Do you think that you could give me an example with this info?
*This is for the 3640.. The 3620 and 3660 have different power requirements. Once I see this done I will do the same for my other equipment. Just want to make sure that I am doing this correctly! Thanks!

Description 3640 Router
Input Voltage, AC 100 to 240 VAC, autoranging
Input Voltage, DC 38 to 72 VDC
Current, AC 2.0A
Current, DC 5.0A
Frequency 50 - 60Hz
Max. power dissipation 140W

 

[burtsbees]

The input AC is what you want---that's 2 amps---if you have a 20 amp circuit, you could hook up 8 of these and be safe. The Catalyst 2924's are .7 amps, 2950 the same, the 2500 router=1.2 amps, the 2600 about the same...so let's add them up...

4x 3640=8 amps
3x 2600=3.6 amps
1x 2950=.7 amps
4x 2924=2.8 amps
1x 2511=1.2 amps

Total=16.3 amps MAX---you'll need a 20 amp circuit---you could get away with a 15 amp circuit, because 75% of 16.3=12.225 amps---that is what they will likely pull in altogether at most. If you have them plugged into a surge protector, you won't have to worry about overload. I say you're safe. Hell---I had 1x2620XM, 3x2620, 3x2924, 1x2503, two computers, one monitor, an HP Laserjet 1320N, a paper shredder, a stereo, and my video camera charger all plugged into a 20 amp circuit---never had a problem!

Burt

 

[maczen]

LoL.. Thanks again! I understand!