UPS goes into electrical noise mode.

[ngjandm]

In the process of getting 2 new 20amp outlets put into my home "office", but right now, I have everything (2 computers, 2 laser printers, routers, modems, record player, TV, couple lamps) all running off outlets on the same 15 amp circuit.   I currently have 3 UPS for all this equipment.   When I send something to print on an older Dell 2130cn printer, once in a while the lights will flicker at most.   The problem is when on my wife's computer, she prints to a Brother MFC 8710-DW printer., the lights flicker for sure, and UPS goes to battery mode.   (Keep in mind, none of the laser printers are connected to a UPS, they are simply on the 15 amp breaker outlet.)   But when she prints, all of a sudden the APC BR1500G starts to go into electrical noise mode, where it just clicks back and forth for sometimes a couple minutes.  My computer is on an APC BX1500M and will once every 5 brother print starts, also, start to click back and forth.