What does installing separate breaker boxes for each office area do to eletrical nois

**Mancora** · 03-25-2004, 02:12 PM

Answer: It reduces the chances of eletrical noise

Thats the most recent question on my networking class that i dont understand at all, my teacher tried to describe it, however her discription was mostly "because it does"...

Is there a chance somone could take a shot on this for me?

**muisejt** · 03-25-2004, 03:17 PM

you talking about isolated ground?

**njdevs95** · 03-25-2004, 03:24 PM

Hmm I can't think of a really good way to explain it but I can give a example of it although it doesn't involve a breaker box. I used to have my entertainment center and wall unit AC plugged into the same outlet and when the ac would come on my tv picture would get scrambled, the local channels would get fuzzy and the digital channels would get pixelated. Don't know if that's the kind of example you're looking for but maybe it will help.

**Mancora** · 03-25-2004, 07:23 PM

:you talking about isolated ground?

Im not sure, they didnt say these, were some sample questions from a Cisco networking test, so that might give you and idea of where their coming from.

:njdevs95

I seem to remember them talking about somethig similar to that, that you could get EMI from having something like a fridge/washing machine and a hub pluged into the same socket... but wait is that right? Wouldn't the problems be mostly because the fridge/washing machine sucks out a ton of juice when it starts thus causing the lights to dim?

Might not the scrambled picture come more from the EMI produced via the unit itself rather what wallsocket it was pluged into?

**Isezumi** · 03-25-2004, 09:45 PM

its mostly about segementing ground circuits...

when you install a breaker box, you have to drive a new ground connection...in the case of an office, its a whole new/seperate connection going to the common grounding rod in the basement, or utility substructure.

As for the AC/Fridge issue...When you have a heavy current drawing motor/compressor on a circuit; when it kicks in you can get strong voltage drops in sync with the phase of the motor. Because of the heavy draw on current, these voltage drops can below tolerance for electronics. Which is why they are placed on their own branch circuits.

03-25-2004, 02:12 PM	#1
Mancora Mako Shark Join Date: Jun 2001 Location: The other side of where the fishes swim Posts: 4,312	What does installing separate breaker boxes for each office area do to eletrical nois Answer: It reduces the chances of eletrical noise Thats the most recent question on my networking class that i dont understand at all, my teacher tried to describe it, however her discription was mostly "because it does"... Is there a chance somone could take a shot on this for me?

03-25-2004, 03:17 PM	#2
muisejt Super Bunny Mod Join Date: Dec 2000 Location: Nova Scotia, Canada Posts: 9,833	you talking about isolated ground? __________________ If your sig is longer than your post then type more.

03-25-2004, 03:24 PM	#3
njdevs95 Hammerhead Shark Join Date: Mar 2002 Posts: 2,273	Hmm I can't think of a really good way to explain it but I can give a example of it although it doesn't involve a breaker box. I used to have my entertainment center and wall unit AC plugged into the same outlet and when the ac would come on my tv picture would get scrambled, the local channels would get fuzzy and the digital channels would get pixelated. Don't know if that's the kind of example you're looking for but maybe it will help. __________________ http://www.danasoft.com/sig/Stillio.jpg Sharkyextreme.com 3dmark Team My 3DMark Compare Link 14429 Antec sx1040 case with 400 watt power supply Epox 8RDA+ motherboard amd xp 2100 (currently @2.21ghz)(170x13) gf4 ti4400 soundblaster audigy gamer Samsung 160gb hd @7200 rpm 8mb cache NEC 2500a DVD Burner lite on dvd rom 16x sony floppy drive 1 gig kingston hyper x ddr pc3200 19 inch hitachi flatscreen monitor logitech cordless keyboard/mouse(optical) All running on win2kpro Get Paid to read Email

03-25-2004, 07:23 PM	#4
Mancora Mako Shark Join Date: Jun 2001 Location: The other side of where the fishes swim Posts: 4,312	:you talking about isolated ground? Im not sure, they didnt say these, were some sample questions from a Cisco networking test, so that might give you and idea of where their coming from. :njdevs95 I seem to remember them talking about somethig similar to that, that you could get EMI from having something like a fridge/washing machine and a hub pluged into the same socket... but wait is that right? Wouldn't the problems be mostly because the fridge/washing machine sucks out a ton of juice when it starts thus causing the lights to dim? Might not the scrambled picture come more from the EMI produced via the unit itself rather what wallsocket it was pluged into? Last edited by Mancora; 03-25-2004 at 07:24 PM.

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03-25-2004, 09:45 PM	#5
Isezumi Not Wurm Join Date: Dec 2001 Location: SAN DIEGO, CA Posts: 7,265	its mostly about segementing ground circuits... when you install a breaker box, you have to drive a new ground connection...in the case of an office, its a whole new/seperate connection going to the common grounding rod in the basement, or utility substructure. As for the AC/Fridge issue...When you have a heavy current drawing motor/compressor on a circuit; when it kicks in you can get strong voltage drops in sync with the phase of the motor. Because of the heavy draw on current, these voltage drops can below tolerance for electronics. Which is why they are placed on their own branch circuits.