Installation Guide

2
Multi-gang Installation
In multi-gang installations several controls are grouped
horizontally in one ganged wallbox or in a series of
interconnected wallboxes. Multi-gang faceplates are
available to simplify and improve the appearance of these
installations. A multi-gang mounting frame is provided
with each standard multi-gang wallplate to ensure proper
alignment of controls, easy application of the wallplate,
and a fl at surface for the installation. This frame is most
easily mounted on the wall before control wires are
connected. Refer to multi-gang instruction sheet supplied
with multigang wallplate.
No Side Sections Removed
(No Derating Required)
Installation of controls without removing side sections
allows operation at full capacity (i.e., no derating
is required). Follow instructions below. For retrofi t
installations, side sections can be removed to fi t existing
wallboxes. See Multi-gang Installation, "Side Sections
Removed" at right.
1. Assure safe operation by using Ballast Chart (Figure
A) to determine maximum number of lamps safely used
with specifi c ballast. Note: Use ONLY dimming ballasts
listed on chart. Do not use any other ballasts.
2. Determine the number of wallboxes necessary by
using Wallbox Requirement Chart in Figure B. When
ganging any combination of "small" (NF-10) and "large"
(NF-20, NF-30, NF-10-277, NF-20-277) controls, place
all small controls at one end of the gang and all large
dimmers at the other end.
3. When ganging an EVEN number of SMALL controls,
use gangable wallboxes with tapped ears as shown below.
Do not use plaster rings or gangbox covers. Space an
"additional" wallbox
3
/4 in (19 mm) apart from the other
wallbox(es). A
3
/4 in (19 mm) chase nipple is recommended
as a spacer between the wallboxes. (Example, 4 small
controls require 5 wallboxes. See Figure C.)
4. Wire each control according to Steps in "Single Unit
Installation" on page 3.
5. Install controls in wallbox(es). When combining
small and large controls, place all small controls on one
extreme end of the gang, and large controls at the other
end of the gang. Use center and offset mounting holes
as required for proper alignment. Allow
1
/32 in (0.8 mm)
between controls for ease in attaching wallplate. See
Figure D.
6. Replace sliders and snap on multi-gang wallplate (or
multiple single wallplates) and adjust up or down for a
snug fi t. Multi-gang wallplates (with mounting frames and
instructions) are available in a variety of colors to beautify
and simplify your installation.
Number of Small Controls
0 1 2 3 4 5 6
Number 0 0 1 1+1* 4 4+1* 7 7+1*
of Large 1 1 3 5 6 8 9 11
Controls 2 4 6 7 9 10 12 13
3 6 8 10 11 13 14 16
4 9 11 12 14 15 17 18
See Item 3
Single-gang
gangable
wallbox
3
/4 in (19
mm) space
(use chase
nipple)
Figure D: Front View - Four-Gang Installation
No Side Sections Removed
Offset Mounting Holes
Center Mounting Holes
1
/32 in (0.8 mm)
Spacing
Side Sections Removed
(Derating Required)
1. Derating is necessary when side sections are
removed. Use Derating Ballast Chart in Figure A. Match
the control size, number of side sections removed, and
the ballast type to determine maximum safe load.
2. Determine number of wallboxes necessary by
using the Wallbox Requirement Chart in Figure E. When
ganging any combination of "small" controls (NF-10) and
"large" (NF-20, NF-30, NF-10-277, NF-20-277) controls,
place all small controls at one end of the gang and all
large controls at the other end.
3. Remove INNER side sections only. Using pliers, bend
side sections down as far as you can and then back to
their original positions. Side sections will break off. See
Figure E.
DO NOT REMOVE OUTER SIDE SECTIONS OF THE TWO
CONTROLS WHICH ARE ON THE ENDS OF THE GANG.
Number of Small Controls
0 1 2 3 4 5 6
Number 0 0 1 2 3 4 5 6
of Large 1 1 3 4 5 6 7 8
Controls 2 3 5 6 7 8 9 10
3 5 7 8 9 10 11 12
4 7 9 10 11 12 13 14
Figure E: Wallbox Requirement Chart
Side Sections Removed
Figure C: Wallbox Positioning Four-Gang C
Figure B: Wallbox Requirement Chart
No Side Sections Removed
Four-gang
gangable wallbox