Digidim 458 Dimmer Installation Guide
Helvar Ltd.
Doc. No. 7860186
Page 3
Issue 1 (10/7/2008)
Step 3 Electrical Installation
WARNING: BEFORE COMMENCING ANY ELECTRICAL WORK, ISOLATE THE
ELECTRICITY SUPPLY AT THE MAIN DISTRIBUTION BOARD.
Mains Supply Voltage Range
The dimmer is designed for use with the following voltage range:
85 to 264 VAC (absolute); 110 VAC / 230 VAC (nominal).
Mains Supply Protection
The mains supply input must be externally protected by an MCB or fuse of a suitable
rating.
WARNING: THE SUPPLY INPUT MUST ONLY BE CONNECTED TO A SINGLE-
PHASE SUPPLY. THE SUPPLY INPUT EARTH MUST BE CONNECTED.
Using Spring-Lever Cage Clamp Terminals
Note:
The supply earth, supply neutral and output terminals are spring-lever cage
clamp terminals.
1. Insert a screwdriver as far as it will go into the terminal release point.
2. Lever the screwdriver back. This opens the cage clamp. (
For output terminals,
levering the screwdriver back is unnecessary).
3. With the cage clamp open, cable can be inserted or removed from the terminal.
4. Release the pressure on the screwdriver and then remove it. This closes the cage
clamp.
If you have inserted a cable, check that the connection is secure.