Ganging and Derating Box-Mounted
Lighting Controls
Ganging is an installation practice where two or more lighting
controls are mounted side-by-side using the required number of
connected wallboxes. Ganging may require the removal of part of
the fins on Architectural Dimmers or part of the mounting strap on
strap-mounted devices. In Architectural Dimmers, the metallic
fins help dissipate heat from within the device. Strap mounted
dimmers use the mounting strap for the same purpose. Therefore,
removing a portion of the fins or strap for ganging purposes will
require derating the dimmers to prevent them from overheating.
Maximum Load Per Dimmer for Multi-Ganging
All Strap-Mounted Dimmers
Chart 1
Dimmer Rating
Single
2-Gang
More than 2-Gang
600W
600W
500W
400W
1000W
1000W
800W
700W
600VA
600VA
500VA
400VA
1000VA
1000VA
800VA
700VA
Maximum Bulb Wattage for Magnetic
Low-Voltage Lighting
Ganging and Derating Leviton
Lighting Controls
When ganging Mural, True Touch, TouchPoint, ToggleTouch and
IllumaTech controls, the side sections of the mounting strap
must be removed. Use pliers to carefully bend side sections
back and forth until they break off. The side sections of the strap
dissipate heat, so removing them requires derating the dimmer’s
capacity. See Chart 1.
Note that Leviton SureSlide and Trimatron lighting controls can
be ganged without removing any sections of their mounting
straps. However, SureSlide and Trimatron controls must also be
derated when they’re ganged.
Low-voltage lighting controls are rated in Volt-Amps (VA). The
maximum bulb wattage is determined by the efficiency of the
transformer in the low-voltage lighting system. Transformer efficiencies vary depending on the manufacturer, so consider 75%
efficiency as average. Use Chart 2 to determine the maximum
bulb wattage for typical transformer efficiency ratings.
Maximum Bulb Wattage at 75% Efficiency
Chart 2
Dimmer Rating
Single
2-Gang
More than 2-Gang
600VA
450VA
375VA
300VA
1000VA
750VA
600VA
525VA
Ganging and Derating Leviton Renoir™ and Van Gogh™ Architectural Lighting Controls
6678-1, 6678-7, 6679-1, 6679-7, 61500,
62000, 71511, 71513, 81500, 81500-3,
81527, 82000, 82000-3, 86678-1, 86678-7,
86779-1, 86779-7
6676-1, 6676-7, 6677-1, 6677-7, 60800, 61000,
61000-3, 71111, 71113, 80800, 80800-3,
80827, 81000, 81000-3, 81127, 86676-1,
86676-7, 86777-1, 86777-7
To Double Gang Narrow Controls
Break off right set of fins on one dimmer and
left side of fins on the other dimmer.
Two-gang outlet box is required.
To Triple Gang Narrow Controls
Break off right set of fins on first dimmer,
both sets of fins on center dimmer, and left
set of fins on third dimmer. Three-gang box is
required.
Double-Ganging Wide Controls
Break off right set of fins on one
dimmer and left set of fins on the
other dimmer. Requires threegang outlet box. No derating
necessary.
Triple Ganging Wide Controls
Break off right set of fins on first
dimmer, both sets of fins on the
middle dimmer, and left set of
fins on third dimmer. Five gang
outlet is needed.
Switch boxes required
for ganging Leviton
architectural controls
when no fins are removed:
Switch boxes
required for
ganging Leviton
architectural
controls when all
inside fins are
removed:
Number of Narrow Controls*
Number of Wide Controls
Cat. No’s.
FIN BREAKOFF POINTS
FOR NARROW CONTROLS
0
0
2
3
4
0
•
•
•
•
•
1
1
3
5
7
8
2
4
6
7
9
11
3
7
9
10
11
13
4
9
11
12
14
16
0
0
1
2
3
4
5
6
0
0
1
2
3
4
5
6
1
1
3
4
5
6
7
8
2
3
5
6
7
8
9
10
3
5
7
8
9
10
11
12
4
7
9
10
11
12
13
14
5
9
11
12
13
14
15
16
6
11
13
14
15
16
17
18
*Narrow controls must have fins broken off to be ganged. See ganging
instructions for narrow controls on this page.
Note: When ganging combinations of small and large controls without removing
fin sections, mount small control on one end, large control on the other end.
T7
1
Number of Narrow Controls
Number of Wide Controls
Cat. No’s.
FIN BREAKOFF POINTS
FOR WIDE CONTROLS
When fins are broken off on wide and narrow controls for ganging purposes, the number of switch boxes required can be
quickly determined by referring to the two charts below. For
example, when ganging a 2000 watt Cat. No. 82000 with a
1000 watt Cat. No. 81000 and no fins are going to be removed,
3 switch boxes will be required as shown in the top chart.
Likewise, you can refer to the bottom chart to determine how
many switch boxes are required when all inside fins are being
removed.
To learn more about Leviton’s outstanding offering of devices visit our Website at: http://www.leviton.com
Derating
Any Architectural Dimmer that has had both sets of break-off fins removed to meet space requirements during installation must have
its wattage specification derated as shown in the chart below. If no fins are removed, no derating is necessary, even when ganging.
Incandescent
Fluorescent
Cat. No.
Watts
Derate To
61000, 81000
1000
800W
When ganging these units, no derating is necessary, except as
shown below when both sets of fins have been removed.
61500, 81500
1500
1300W
6677 – 16 lamps
86677 – 16 lamps
1800W
6679 – 36 lamps
86679 – 36 lamps
62000, 82000
2000
Ganging and Derating Leviton Monet™ Lighting Controls
Multi-Gang Installation
No Fins Broken Off
CAUTION: Do not gang dimmers vertically (one directly above
another).
• It is recommended to install dimmers without breaking off fins
whenever possible so that derating is not necessary, even
when ganging. If an installation requires breaking off fins for
space requirements, derating is required.
• When ganging combinations of narrow and wide dimmers
and ordering a custom wallplate, all narrow dimmers are
required to be at one end of the gang, and all wide dimmers
are required to be at the other end of the gang.
• Adapter plates (Cat. No. MN0LA or MN0SA) available for
multi-gang installations using any Leviton Decora®-style
device.
No Fins Broken Off
Table 1 – Outlet Box Requirements
Wide
Narrow Controls (600W/VA, 1000W/VA, 7.5A)
Controls
0
1
2
3
4
5
6
(1500W/VA,10A)
0
1
2
3
4
0
1
4
7
9
1
4
6
9
3
5
8
10
5
7
9
6
8
9
10
10
Fins Broken Off
Table 2 – Outlet Box Requirements
Wide
Narrow Controls (600W/VA, 1000W/VA, 7.5A)
Controls
0
1
2
3
4
5
6
7
8
9
(1500W/VA,10A)
Refer to Table 1 for the size and number of outlet boxes required
for multi-gang installations.
A multi-gang masonry box or a multi-gang switch box with a
raised cover are recommended for easy installation, although
standard outlet boxes will work. No derating is necessary.
Example of 5-Gang Outlet box with 3 Narrow Dimmers and No
Wide Dimmers (note mounting holes).
0
1
2
3
4
5
0
1
3
5
7
9
1
3
5
7
9
2
4
6
8
10
3
5
7
9
4
6
8
10
5
7
9
6
8
10
7
9
8
10
9
Maximum Load Per Monet Dimmer Multi-Gang
with Fins Broken Off
Table 3
Fins Broken Off
Refer to Table 2 for the size and number of outlet boxes required
for multi-gang installations when all inside fins are removed.
NOTE: The fins on the dimmers have special break-off points
that allow removal of partial fin sections for ganging. Use pliers
to carefully bend fin sides back and forth until they break off.
(See Figure 2). These sections should only be removed at the
break-off point to permit proper ventilation. DO NOT remove
side sections on extreme ends of the gang.
Example of 3-Gang Outlet box with 3 Narrow Dimmers and No
Wide Dimmers (note mounting holes).
Cat. No.
Single
2-Gang
More than 2-Gang
MNI06
600W
500W
400W
MNI10
1000W
800W
700W
MNI15
1500W
1250W
1000W
MNM06
600VA
500VA
400VA
MNM10
1000VA
800VA
700VA
MNM15
1500VA
1250VA
1000VA
MNX10
1000VA
800VA
700VA
MNF07
7.5A
6A
5.3A
MNF10
10A
8A
7A
Break-Off Fins
(Side Sections)
Light Bar
Slider
Mounting Strap
Figure 1 – Dimmer Function
For answers to technical questions, call Leviton’s Techline at 1-800-824-3005
Figure 2 – Break-Off Fin Removal
T8
Ordering Monet™ Multi-Gang Wallplates
No Fins Broken Off
Table 1 – Outlet Box Requirements
Wide
Narrow Controls (600W/VA, 1000W/VA, 7.5A)
Controls
0
1
2
3
4
5
6
(1500W/VA,10A)
0
1
2
3
4
0
1
4
7
9
1
4
6
9
3
5
8
10
5
7
9
6
8
9
10
10
Monet™ Multi-Gang Wallplates for
Installations with No Fins Broken Off
Fins Broken Off
Table 2 – Outlet Box Requirements
Wide
Narrow Controls (600W/VA, 1000W/VA, 7.5A)
Controls
0
1
2
3
4
5
6
7
8
9
(1500W/VA,10A)
0
1
2
3
4
5
0
1
3
5
7
9
The second digit represents the number of large-fin devices in
the combination:
MNW24 = 4 large-fin Monet Dimmers
In the suffix, FB indicates that fins have been broken off:
MNW24-FB = Fins Broken Off
The last letter in the suffix indicates the color of the wallplate:
MNW24-FBE = Black wallplate
1
3
5
7
9
2
4
6
8
10
3
5
7
9
4
6
8
10
5
7
9
6
8
10
7
9
8
10
9
Monet multi-gang wallplates are available for every permissible
combination of small fin and large fin dimmers. Tables 1 and 2
can be used to determine if a specific combination of devices is
possible. When small and large fin devices are combined, all
the large fin devices must be placed to one side and all the
small fin devices must be placed to the other side. In an installation where all the fins are broken off, do not remove the fins
from the dimmers at each of the extreme ends of the installation.
Monet multi-gang wallplates are ordered using the following
catalog number system.
Example: Cat. No. MNW31-00W
MNW = Monet Wallplate
The first digit represents the number of small-fin devices in the
combination:
MNW3 = 3 small-fin Monet Dimmers
The second digit represents the number of Large Fin devices in
the combination:
MNW31 = 1 large-fin Monet Dimmer
In the suffix, the double-zero indicates that no fins have been
removed:
MNW31-00 = No fins removed
The last letter in the suffix indicates the color of the wallplate:
MNW31-00W = White wallplate
Multi-gang wallplates ar available in the following colors (add
letter to suffix as indicated): Ivory (-I), White (-W), Almond (-A),
Gray (-G), Black (-E) and Brown (-B).
Catalog Number (Add suffix to indicate color): Ivory (-I), White
(-W), Almond (-A), Gray (-G), Black (-E) and Brown (-B).
MNW10-00
MNW20-00
MNW30-00
MNW40-00
MNW50-00
MNW60-00
MNW01-00
MNW02-00
MNW03-00
MNW04-00
MNW11-00
MNW21-00
MNW31-00
MNW41-00
MNW51-00
MNW12-00
MNW22-00
MNW13-00
MNW32-00
MNW23-00
Monet™ Multi-Gang Wallplates for
Installations with Fins Broken Off
Catalog Number (Add suffix to indicate color): Ivory (-I), White
(-W), Almond (-A), Gray (-G), Black (-E) and Brown (-B).
MNW20-FB
MNW30-FB
MNW40-FB
MNW50-FB
MNW60-FB
MNW70-FB
MNW80-FB
MNW90-FB
MNW11-FB
MNW21-FB
MNW31-FB
MNW41-FB
MNW51-FB
MNW61-FB
MNW71-FB
MNW81-FB
MNW02-FB
MNW12-FB
MNW22-FB
MNW32-FB
MNW42-FB
MNW52-FB
MNW62-FB
MNW03-FB
MNW13-FB
MNW23-FB
MNW33-FB
MNW43-FB
MNW04-FB
MNW14-FB
MNW24-FB
MNW05-FB
An example of ordering Monet multi-gang wallplates when fins
are broken off.
Example: Cat. No. MNW24-FBE
MNW = Monet Wallplate
The first digit represents the number of small-fin devices in the
combination:
MNW2 = 2 small-fin Monet Dimmers
T9
To learn more about Leviton’s outstanding offering of devices visit our Website at: http://www.leviton.com