P/N PM000199A • Rev. 3 • ISS 25APR2018 1 of 5
© 2018 Ascom, Inc.
NUDL-Series Dome Light Installation Sheet
Models NUDL2S-H and NUDL4S-H
Description
The NUDL-series dome light devices are bright, easy-to-
see visual annunciators that signal call events and provide
power connections for modules attached to a room bus.
The dome lights connect to the hallway bus. The series
includes the NUDL2S-H (two-section dome light) and the
NUDL4S-H (four-section dome light). It also includes an
auxiliary I/O connector with two inputs and one relay
output. The relay is only available in the NUDL4S-H model.
Installation
Note: Before beginning the installation, ensure all the
necessary cables are available and are properly
terminated. RJ-45 connectors should be terminated in
accordance with the T568B or EIA 568B connection
standard.
Mounting with Backplate and Spacers
The dome light mounts to a backbox using a backplate
(included) that supports the device. Each backplate
includes an array of holes that allow for mounting on
North American- and EU-style backboxes. In areas where
no backboxes are available, you can use backplate spacers
to mount the devices directly to flat wall surfaces.
Backplate spacers are sold separately.
To mount the backplate on a backbox:
1. Place the backplate over the backbox with the arrow
facing up.
2. For North American-style backboxes, insert the screws
though the backplate and into the backbox.
–or–
For EU-style backboxes, loosen the screws so that
approximately 5mm extend from the backbox so that the
heads of the screws can pass through the keyhole slots.
3. Turn the backplate until its top is level.
4. Tighten the screws until they are snug. Do not over-
tighten.
5. Pull the cables from the backbox through the backplate
hole.
Mounting the Dome Light Without a Backbox
When no backbox is available, you can mount the device
directly to a flat wall surface using four screws suitable for
the wall type. Cable wires should enter and leave the dome
light’s housing through the hole in the center of the
backplate spacer, or through the knockouts in the top and
sides of the backplate spacer. Depending on the number of
wires entering the backplate spacer, you may need to
remove a portion of the cable’s jacket to ensure it will fit
through the knockout and in the backplate spacer.
When choosing a wall location for a dome light, consider
where the connecting cables are located. If the cables are run
inside the wall, locate the dome light over the hole where the
cables exit from the wall. If the cables are run in a channel
outside the wall, locate the dome light below and to the right
or left of the channel, where the cables exit the channel. The
cables should enter the through the knockout holes in the
dome light’s backplate spacer.
Note: Do not distort or twist the backplate when mounting it
to a wall. If the backplate is distorted, the dome light will not
fit properly and may fall off.
