Mounting a UL 864 Smoke Control Enclosure

The enclosures you use in the EcoStruxure BMS smoke control system must meet the following minimum criteria.

Any enclosures you use to house controllers and products participating in the smoke control system must be UL Listed under one of the following UL Standards:

• UL 50 Enclosures for Electrical Equipment

• UL 508/508A Industrial Control Panels

• UL 864 Control Units and Accessories for Fire Alarm Systems

Compliance with one of those standards will regulate the dimensions of the enclosures sides (height, width, depth), the gauge of metal used to produce the enclosure and the strengthening/forming of the metal necessary for the gauge metal used.

The enclosures you use for the PS-24V, Automation Server (AS-SMK), AS-P (AS-P-SMK), SmartX IP controllers and the I/O modules must also provide a minimum metal surface area based on the power (watts) being dissipated inside the enclosure.

The selected metal enclosure must provide a minimum volume of 125 cubic inches for each watt of power that is dissipated in the enclosure. The value referenced here now extracts the 10 watts for the PS24V supply that was fixed in the previous document calculation. The calculated PS24V watts is now added to the accumulated IO bus device power in the enclosure. This scheme accommodates the additional power encountered when more than one PS24V is mounted in the enclosure and also those situations where no PS24V is required in the enclosure.

For example, an enclosure that measures 24 inches (610 mm) high x 24 inches (610 mm) wide x 10 inches (254 mm) deep provides a volume of 5760 cubic inches. Dividing 5760 by 125 produces a max power value of 46 watts. For the 24x24x10 sized enclosure, the sum of the name plate power ratings for the Smoke Control Server and I/O modules and the calculated PS24V power and any accessory devices must not exceed the 46 watts value.

The PS24V power reaches the 10W maximum when its output is the full 30W to the server and I/O modules on the bus. To calculate the PS24V power disipation, you multiply the percentage of full output power by 10 and enter the resulting value in the accumulated power table as follows.

PS24V Power Disipation = Output Watts / 30 * 10

In your calculations, be sure to also include any accessory items such as an EIS series Ethernet Switch (6W for Copper version and 10W for Fiber version) and the 24 VAC power transformer (if mounted in the same enclosure).

The approved 24 VAC transformers have output ratings ranging from 40 VA to 240 VA. The efficiency of the transformer determines the amount of that maximum load VA that will be dissipated in the enclosure as heat.

For more information, see Smoke Control Enclosures and Requirements .

For more information, see Transformers .

SEBOX includes a series of UL NEMA 4 rated enclosures with the following features:

• UL Listed under UL 508A on file E103582

• Large embedded cable-entry plate with neoprene seal

• Standard 3-mm double-bar lock with screw driver lock feature

• Optional key lock KEL-RET4-LOCK with key (405)

• Foamed-in polyurethane gasket doors that guarantee water and dust tightness

• Removable and reversible door with hinges allowing door to open 120°

• Available with optional field-installed perforated subpanel (P suffix models)

• Epoxy-polyester resin finish, color RAL 7035 grey

 

action_zoom_plus_stroke

A variety of SEBOX enclosure sizes are available as shown in the table that follows.

Table: SEBOX Series Wall-Mounted Enclosures

1. The P suffix is added at the end of the model numbers when the internal, perforated panel is required.

The SEBOX enclosure and perforated panel model weights are also supplied in this document. For more information, see UL 864 Smoke Control Enclosure Mounting Hardware .

The following graphics illustrate the dimensions of the SEBOX enclosures. The first figure shows the dimensions of the smaller enclosure models, the SEBOX121806 and SEBOX161608.

 

action_zoom_plus_stroke

The second figure shows the dimensions of the larger enclosures, including the SEBOX202010, SEBOX242408, SEBOX392410, SEBOX393210, and SEBOX483212.

 

action_zoom_plus_stroke

The graphic that follows shows the SEBOX cable entry dimensions and types. The cable entry letters in the graphic correspond to these particular SEBOX models:

• Cable entry B: SEBOX121806

• Cable entry C: SEBOX161608

• Cable entry D: SEBOX202010, SEBOX242408 and SEBOX392410

• Cable entry E: SEBOX393210

• Cable entry: H: SEBOX483212

 

action_zoom_plus_stroke

Key Lock Option

The Key Lock option is available under part number KEL-RET4-LOCK listed on iPortal. This locking accessory is used on the CRN series enclosures such as the SEBOX and provides 1 metal cam, 1 escutcheon with key lock and 2 keys (Key 405). The part number is equivalent to the NSYCLL405CRN as seen on datasheets under that number.

 

action_zoom_plus_stroke

Figure: SEBOX key lock option

Perforated Back Plate

The P suffix version of the SEBOX includes a perforated back plate for mounting the controller products. The perforated plate version of the SEBOX202010 is shown here as an example.

 

action_zoom_plus_stroke

Figure: SEBOX perforated plate version

The SEBOX models and the A-D dimensions for each of their perforated plate versions are listed in the table that follows.

SEBOX Model	Dimension A	Dimension B	Dimension C	Dimension D
SEBOX121806P	9.376 in, 247.3 mm	15.618 in, 396.7 mm	8.875 in, 225.43 mm	14.750 in, 374.65 mm
SEBOX161608P	13.625 in, 346.08 mm	13.625 in, 346.08 mm	12.750in, 323.85 mm	12.750 in, 323.85 mm
SEBOX202010P	17.590 in, 446.91 mm	17.590 in, 446.91 mm	16.750 in, 425.45 mm	16.750 in, 425.45 mm
SEBOX242408P	21.500 in, 546.1 mm	21.500 in, 546.1 mm	20.625 in, 523.88 mm	20.625 in, 523.88 mm
SEBOX392410P	37.312 in, 947.74 mm	21.562 in, 547.69 mm	36.375 in, 923.93 mm	20.625 in, 523.88 mm
SEBOX393210P	37.250 in, 946.15 mm	29.376 in, 746.15 mm	36.375 in, 923.93 mm	28.500 in, 723.9 mm
SEBOX483212	45.184 in, 1147.68 mm	29.368 in, 745.95 mm	44.312 in, 1125.54 mm	28.500 in, 723.9 mm

Prior to the introduction of the SEBOX series wall-mounted enclosures, Schneider Electric provided a collection of wall-mounted enclosures referred to as the Unity Series enclosures. These are no longer supplied by Schneider Electric. However, you can still acquire them directly from Unity Manufacturing (see the following details). On existing projects, it may be appropriate and more convenient to expand or revise a project with the same style and size enclosures as previously installed.

Table: Unity Series Wall-Mounted Enclosures

You obtain the Unity Manufacturing enclosures at the following address:

Unity Manufacturing

210 E. Buckingham Rd.

Garland Texas 75040

972-272-9502

The MNA-FLO-1 is a small enclosure designed for mounting over the damper shaft and fastening to the VAV box panel. The MNA-FLO-1 accomodates the internal mounting of VAV controllers, such as the MP-V-7A-SMK, MP-V-9A-SMK, b3865-V-S, b3866-V-S, b3885-V-S, MNB-V1-2 and MNB-V2-2. The following figure shows the MNA-FLO-1 enclosure.

 

action_zoom_plus_stroke

The MNA-FLO-1 provides knockouts in the positions shown for .50 inches (13 mm) or .75 inches (19 mm) conduit connections.

For more information, see MNA-FLO-1 Enclosure .

The MNB-300-ENC is a small enclosure designed specifically to house the MNB-300 controller. You can mount this enclosure on a wall or panel. Four integrated mounting studs are provided in the base for attaching the MNB-300.

Conduit connections are supported with two knockouts along the top and bottom of the unit. Each knockout provides a double size supporting a 0.875 inch (22 mm) hole for .50 inch (13 mm) conduit, or a 1.125 inch (28 mm) hole for .75 inch (19 mm) conduit.

 

action_zoom_plus_stroke

Typically, the UL-ENCL is a small enclosure you use with field controllers. This enclosure is 19 inches (483 mm) high, 15 inches (381 mm) wide, and approximately 4 inches (102 mm) deep, including a 3 inch (76 mm) base with a two tiered door. Vent louvres are provided on the left and right sides of the enclosure.

You can wall mount this enclosure using the two key slot holes (.28 inch (7 mm) x .50 inch (13 mm)) along the top of the enclosure and two .28 inch (7 mm) along the bottom of the enclosure.

 

action_zoom_plus_stroke

The UL-ENCL enclosure does not feature a DIN rail. Instead, you mount controllers and expansion modules using screws fastened through the pre-drilled backplate. A key lock and a tamper switch are also provided for added security. The enclosure provides space to accommodate controller and power transformer mounting.

 

action_zoom_plus_stroke

For conduit connections, 1.65 inch (42 mm) knockouts are available on the right (2), left (1), top (2), bottom (2) and rear (2).

The I2-ENCL-S enclosure is the same design and is used for the same applications as the model UL-ENCL enclosure described previously. The model UL-ENCL replaces the I2-ENCL-S enclosure. However, you may encounter existing I2-ENCL-S enclosures when upgrading an existing system to an EcoStruxure BMS smoke control system. The continued use of the I2-ENCL-S enclosure is approved in the EcoStruxure Building Operation system.

Typically, the 3P-UL-ENCL enclosure is a legacy system enclosure used with Continuum DIN rail mounted controller products. The enclosure measures 36 inches (913 mm) x 24 inches (610 mm) x 6.5 inches (165 mm) (Height x Width x Depth) and provides 3 DIN rails that you can use for mounting the power supply, controller and I/O modules. Generally, the Unity series enclosures are used for new system installations, but the 3P-UL-ENCL is also approved for use in the EcoStruxure Building Operation smoke control system.

 

action_zoom_plus_stroke

The VAV-ENCL-S is a small enclosure specifically designed for VAV controllers such the b3865-S and b3866-S. Typically, this enclosure is not sold with new systems. However, you may frequently encounter it when upgrading previous systems to the EcoStruxure BMS smoke control system. You can also use this enclosure when changing to any of the other listed VAV controllers. Refer to the EcoStruxure BMS Smoke Control Design Guide for more information. 

This enclosure is 14.25 inches (362 mm) high, 12.3 inches (312 mm) wide, and approximately 4 inches (102 mm) deep. A .88 inch (22 mm) hole is provided in the rear for insertion of the VAV damper shaft and mating with the VAV actuator collar. For conduit connections, three knockouts are provided on the bottom and one on the right of the unit.

 

action_zoom_plus_stroke

The Unity series enclosures have been in wide use for a number of years with the Continuum series controllers. The SEBOX and Unity enclosure models referenced here are approved for use with smoke control systems for housing the legacy controller models described in this guide. These enclosures provide additional space for the controllers, accessories, and the segregation and routing of controller wiring.

When used with the b3, i2, b-Link, Infilink and other referenced accessory items, select the enclosure size that achieves a metal enclosed volume of 71 cubic inches (or larger) per watt using the accumulated ratings for the controller devices. You can include transformers listed in the Smoke Control System Design Guide in the enclosure. For more information, see Transformers .

You must position the legacy controller assemblies and accessory electronics devices in the enclosure to provide a minimum vertical space of 1 inch (25.4 mm) above the transformer and a minimum horizontal space of .50 inch (12.7 mm) between the transformer and the electronics.

As an example, consider the following legacy application.

The most commonly used model UNM-SCH242410RC enclosure provides a 24 inch (609.59 mm) x 24 inch (609.59 mm) x 10 inch (254 mm) size that you can use to house a b3/i2920 controller along with the two supported xP expansion modules. The controller is 45VA and the expansion is 6VA (maximum for the two xP modules) giving a total of 51VA. This delivers 123 cubic inches per watt which complies with the 71 cubic inch minimum.