user_standard Log on
Log on to rate and give feedback 1 2 3 4 5 Log on to rate


Products: AS-P Smoke Control, Automation Server Smoke Control, MP-C Smoke Control, MP-V Smoke Control
Functionalities: Smoke Control
Product version: 2022, 2023, 2024

Smoke Control System Restrictions

These restrictions are associated with the application of BACnet/IP controllers to UL 864 smoke control systems. They take precedence over existing product literature and are required for compliance with the UL 864 Listing.

This section describes the restrictions for the Smoke Control System and includes the following topics:

  • System Overrides that Require and Do Not Require Removal

  • Approved Fire Alarm Panels

  • Approved FSCS

  • Approved Ethernet/IP Infrastructure Devices

  • Dedicated Supply Air Dampers

  • Transformers

  • Wiring

  • Software Revision Control and Restrictions

System Overrides that Require Removal

If a person with manager-level (programmer-level) access overrides any values or functions in the Smoke Control Servers or BACnet field controllers in a manner that impedes the automatic smoke control functions or interferes with the FSCS's absolutely highest priority control over the system, then the overrides must be removed before the system is returned to normal operation. This rule always applies whether the purpose of the override is for troubleshooting, service, programming, or temporary control.

System Overrides that Do Not Require Removal

Overrides do not need to be removed before the system is returned to normal operation if they are initiated in a manner that does not impact the automatic smoke control functions or the ability of the FSCS to have absolutely highest priority control over the system. Such overrides can be considered exceptions to the restriction described previously in System Overrides that Require Removal.

Approved Fire Alarm Panels

Any UOJZ listed fire alarm panel that provides a BACnet/IP Ethernet protocol interface can be used with the EcoStruxure BMS smoke control system. The Listed Fire Alarm Control Unit (fire alarm panel) is the primary indicator for smoke and fire alarm conditions. These panels are listed for the UOJZ category of the UL 864 standard. The BACnet/IP interface from the fire alarm panel is connected to one of the approved EIS series switches/hubs and the fire panel is communicated with from the Smoke Control Server assigned as the fire panel manager.

Alternatively, any UOJZ listed fire alarm panel with programmable relay contact alarm zone outputs can be used with the EcoStruxure BMS smoke control system. The dry, contact outputs from the UOJZ listed fire alarm panel can be wired directly to the appropriate inputs of the EcoStruxure BMS Central IO modules or the inputs of the BACnet field controllers

Approved FSCS

Only the ADI FSCS can be used with the EcoStruxure BMS smoke control system. For more information, see FSCS Basics .

Approved Ethernet or IP Infrastructure Devices

Any UL 864 recognized or listed IP infrastructure device can be used to create the network topology. The path through the Ethernet/IP network from any one device to another must use only UL 864 approved infrastructure devices. The Ethernet/IP Smoke Control System can coexist with the non-UL 864 networks as long as they are isolated from those networks through the use of UL 864 approved IP infrastructure devices.


At no time can any smoke control communications required for system operation be passed over the public internet.

IP Level MP Controllers and Non-Managed Switch

The IP level MP controllers provide an optional feature of enabling RSTP protocol that facilitates a looped Ethernet daisychain from one managed switch port to another managed switch port. This feature increases reliability by providing automated recovery from a single cable break, or from an MP controller power loss or failure event. At this time, there are no managed switches that are UL864 recognized or listed. The approval of a managed switch is needed to permit its use in the EcoStruxure Building Operation smoke control system. A UL864 recognized managed switch supporting RSTP and providing copper and fiber ports is under development. However, a vendor completion date is not committed to, although end of 2020 is targeted. Until such a switch is available, the IP level products used in the smoke control system must be configured without RSTP and must use the EIS series of unmanaged switches listed in this document.

Dedicated Air Supply Dampers

In many cases, a dedicated motor-driven damper may need to be installed in the common supply air duct feeding each smoke control zone. This damper is required to provide smoke zones that are negatively pressurized with respect to all contiguous smoke control zones, within the response time specified by NFPA 92 and UL 864.

Dedicated supply air dampers are not required if the damper response time is acceptable, under the following conditions:

Negative pressurization of the smoke zone is considered accomplished when the total flow rate (CFM) supplied to the zone drops below 50% of its maximum while its associated dedicated exhaust damper is fully open. Positive pressurization of a smoke control zone is considered accomplished when the total flow rate (CFM) supplied to the zone reaches 50% of its maximum while its associated dedicated exhaust damper is fully closed.

Additionally, if the local Authority Having Jurisdiction (AHJ) determines that the longer damper travel times specified are acceptable, the dedicated supply air dampers can be omitted.


Only approved transformers listed in this guide can be used with the EcoStruxure BMS Smoke Control Servers, Central IO modules and field controllers that directly take part in smoke control operation. Certain transformers must be mounted in enclosures to meet UL 864 requirements.

Fire Alarm Wiring for Central IO Modules and Field Controllers

The I/O interface wiring that connects the Central IO modules or the field controllers to the UOJZ listed fire alarm panel when contact closure interface is used, are considered unsupervised. When this wiring connects to the UOJZ listed fire alarm panel, the Central IO modules or field controllers must be mounted within 20 feet of the panel to which they are connected and wiring must be run in conduit. The table that follows lists the general requirements for wiring associated with the smoke control applications.

Table: Wiring Requirements



IP Network / LAN

Supervised between the Smoke Contorl Servers, MP-C and MP-V controllers, and IP-IO modules. Supervised by applications in the Smoke Control Servers and the IP controllers and modules they manage (host).

For more information, see EcoStruxure BMS Smoke Control for BACnet MS/TP .

For more information, see AS-P and AS-P-NLS Installation .

Observe location and cable restrictions (same room with EIS switch) applicable specifically to the AS-SMK, which is discontinued but may still be encountered in the field.

BACnet/IP LAN to Fire Alarm Panel

Supervised by the Smoke Control Server application managing the Fire Alarm Panel

ADI FSCS Interface

Supervised by the FSCS Z-Card processor

RS-485 Bus to Field Controllers

Supervised by the Smoke Control Server application managing the field bus network

Contact Interface to Fire Alarm Panel

Unsupervised. Wiring must be run in conduit and controllers must be located within 20 feet of the panel.

Remaining I/O


Spacing Between Power-Limited and Nonpower-Limited Circuits

The 10th edition of the UL864 standard introduces a spacing requirement of 0.25 inch (6.35 mm) between Power-Limited wiring and line voltage (Nonpower-Limited) connections on the controller products. This requirement originated from the National Electric Code and was adapted into the latest UL864 standard. This was discussed in the previous edition of this guide (04-16014-20), in section 8.4. This guide now introduces several models with options for line voltage circuits. Line voltage connections on controllers listed in this guide are found on the controllers with relay outputs rated for 120 VAC or 240 VAC. For UL864 systems, the line voltage rating is only applicable to the relay outputs on the MP controllers and the terminal base mounted Central I/O DO modules. Typical smoke control (and HVAC) systems in North America use low voltage Class-2 wiring from controllers' (relay and Triac) DO terminals. Schneider Electric UL864 listed legacy field controllers all have relay outputs rated for Power-Limited Class-2 circuits where this spacing issue on controller terminals does not arise. Continued use of this power rating on the IP controllers also avoids the spacing issue.

If an application environment requires you to connect Nonpower-Limited wiring to a relay from DO points on a controller rated for 120 VAC or 240 VAC, you must observe the following restriction:

  • When wiring DO outputs with a combination of line voltage and Class-2 low voltage circuits, you must achieve a spacing of 0.25 inch (6.35 mm) between any line voltage and low voltage circuits on the terminal blocks. Leaving a DO terminal vacant is a method of achieving the required separation. To avoid the need for multiple gaps, the low voltage circuits should be grouped together at one end of the DO terminal block(s) and the line voltage circuits grouped together at the other end of the DO terminal block(s) and one DO terminal is left vacant/unused between the two families of DO circuits.

The high power relay present on some MP-C models has a separate, fixed terminal block with the 0.25 inch (6.35 mm) spacing between terminals. The power relay output can be used on either type of circuit, regardless of what is used on the nearest adjacent DO output. The spacing requirement and impact on the DO terminals only applies when mixing low voltage and line voltage on the relay outputs, with the exception of MP-C-18A model controllers. On this model, the Triac output DO-4 and relay output DO-5 are on separate but directly adjacent terminal blocks. If line voltage is used on relay output DO-5, then Triac output DO-4 must be vacant.

Beyond the relay terminal wiring described in the preceding paragraphs, you should separate the Nonpower-Limited circuits such as the line voltage feeding the transformer primary inputs and any line powered relay circuits from the Power-Limited circuits in the equipment enclosure with a minimum separation of 0.25 inch (6.35 mm). These two circuits should use separate conduit portals for extending to the field devices. Where the Nonpower-Limited wiring traverses the enclosure, a separate wiring duct to a separate entry/exit location in the enclosure is recommended for maintaining the separation. When laying wires, ensure that field wiring does not lie over the top or face of the Central IO modules or field controllers.

Software Revision Control and Restrictions

Beginning with the 9 th Edition of the UL 864 standard and continuing with the 10 th edition, the version of the software approved for operation in the smoke control application is controlled by the UL listing and the supporting application test and validation process. To maintain compliance with the UL 864 system listing, it is required that approved software revisions are operating in the Smoke Control Servers, Central IO modules, and field controllers participating in the smoke control application.

The Smoke Control Servers will always ship from the factory with a software version approved for smoke control. Frequently, this will not be the latest version of the software available for the standard Automation Server (AS) or AS-P. The AS-P-NLS-SMK model requires a later firmware version than supported by the AS-SMK and AS-P-SMK and will initially ship with version software. The Smoke Control Servers should not be updated in the field to a software version unless it has been approved for smoke control applications.

Schneider Electric will select appropriate later software revisions for testing and validation of the smoke control applications. These will be submitted to UL for approval and additional system validation when required by UL. A document listing the approved EcoStruxure BMS software revisions for smoke control applications will be maintained on the Exchange website. You should visit the Exchange site to access the latest version of the document, EcoStruxure BMS Smoke Control System- Approved Software Revisions. You can search by title or by document number (01-16001-xx-en).

System Engineering and Installation Compliance

The products and resulting systems discussed in this guide are intended to be engineered and installed in accordance with the following:

  • Local authority having jurisdiction

  • NFPA 70– National Electrical Code

  • NFPA 72– National Fire Alarm Code

  • NFPA 92– Standard for Smoke Control Systems

Over-Current Protection on Relay Outputs

When connecting non-power-limited circuits, there is a requirement for either current limiting or over-current protection to prevent fault currents in excess of current ratings for gauge of interconnecting wiring. All of the EcoStruxure BMS system field wiring is designated as power-limited with the exception of the relay control outputs. When using a non-power-limited source for the relay output circuit, you must provide current limiting protection (for example, a fuse or circuit breaker) in the relay power supply circuit to prevent fault currents in excess of the current rating for the wire gauge/size permitted by the National Electrical Code, ANSI/NFPA 70 or as specified in the installation wiring diagram/instructions. The over-current protection provided shall be as specified in Article 240 in ANSI/NFPA 70.


The EcoStruxure BMS smoke control system is intended to be installed in a dry indoor environment with a temperature of 0°C to 50°C.

Smoke Control System General Comments

The following general comments may provide additional insight or flexibility during the smoke control system engineering process.

FSCS Requirement

In some cases, the FSCS may be considered optional. The Authority Having Jurisdiction (AHJ) determines whether an FSCS is required.

Pressure Differential Guidelines

Since air pressure keeps smoke from spreading, the primary design factors for a smoke control system are the amount of pressure needed to confine the smoke and the size of the system used to create this pressure.

For the smoke control system to create a barrier of air pressure between the smoke zone and surrounding zones, the amount of pressure required varies with the height of the ceiling and whether or not the building has a sprinkler system. The following table indicates the minimum pressure differential needed to keep smoke out of surrounding rooms.

Table: Table: Minimum Pressure Differential to Pressurize Fire Zone

Sprinkler System

Ceiling Height (ft)

Minimum Pressure Differential (wg)













For buildings without sprinklers and with ceiling heights not shown in the table, use the following formula to determine the minimum amount of pressure needed to keep smoke out:

MinimumPressure = 7.64 x H x [(1/To) - (1/Tf)] + SafetyFactor

H is the distance between the fire space and a surrounding space where the pressure differential is zero. A figure of the floor to ceiling height is a conservative estimate.

To is the absolute room temperature of the surrounding zones measured in °R (degrees Rankine). Typically, To = 530°R (70°F). The conversion from °R to °F is: °R = °F + 460.

Tf is the absolute temperature of hot gases in the fire zone. It is also measured in °R. Typically, Tf is 2160°R (1700°F).

SafetyFactor is a constant added to the results to make sure they are sufficient. A value of 0.03 wg (inches water gauge) is recommended.

Pressure buildup in an area depends on how much leakage there is. Leakage occurs through joints, cracks, openings for pipes and wires, gaps between doors and their door jams, and so forth. The better the zone is sealed off from its neighbors, the easier it is to maintain the required pressure. Since larger openings, like doorways that are normally open, require large amounts of air to maintain pressurization, you should avoid this type of situation.

  • Smoke Control Operational Overview
  • EcoStruxure BMS Smoke Control for BACnet MS/TP
  • AS-P and AS-P-NLS Installation
  • FSCS Basics