This set of pictures shows the functional arrangement of Advance 3 position bypass switches as used with UPS systems
The bypass switch must be correctly sized in terms of current capacity (Amps) for the UPS
Installers should be aware that the bypass must be installed in compliance with all relevant codes.
The input, UPS and output EARTH connections to the switch must ALL be made and tested for continuity
In normal use the switch is switched to `NORMAL' which provides the critical load with UPS protection. When the UPS is to be tested, the critical load is operated from the main supply via the bypass switch in the `TEST' position. When the UPS is to be disconnected, the switch is put in the `BYPASS' position
switch position |
connections |
diagram |
| NORMAL
|
supply to UPS input and UPS supplies output |
supply
loadUPS |
| UPS & BYPASS (older units TEST) |
supply to UPS input and supply to load |
supply
load UPS |
| BYPASS
|
supply to load via switch UPS isolated |
supply
load UPS |
| Switch type |
Switched connections |
Single phase |
Live and neutral |
Three phase |
L1,L2,L3 and neutral |
These notes are provided to assist trained electricians in the principle of operation and are not intended for use by unskilled personnel
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