Extron electronic MLC 52 manual UL Requirements, Installation Procedures

UL Requirements

The Underwriters Laboratories (UL) requirements listed below pertain to the installation of the MLC into a wall or furniture.

1.Elevated operating ambient temperature — If the equipment is installed in a closed or multiunit rack assembly, the operating ambient temperature of the rack environment may be greater than room ambient. Therefore, consider installing the equipment in an environment compatible with the maximum ambient temperature (Tma) specified by the manufacturer. For the MLC 52, the Tma is 122 °F (50 °C).

2.Reduced air flow — Installation of the equipment in a rack should be such that the amount of air flow required for safe operation of the equipment is not compromised.

3.Mechanical loading — Mounting of the equipment in the rack should be such that a hazardous condition is not achieved due to uneven mechanical loading.

4.Circuit overloading — Consideration should be given to the connection of the equipment to the supply circuit and the effect that overloading of the circuits might have on overcurrent protection and supply wiring. Appropriate consideration of equipment nameplate ratings should be used when addressing this concern.

5.Reliable earthing (grounding) — Reliable earthing of rack-mounted equipment should be maintained. Particular attention should be given to supply connections other than direct connections to the branch circuit (e. g., use of power strips).

Installation Procedures

The MLC 52 can be installed into a wall or furniture. Follow the instructions appropriate to the mounting option you have selected.

Preparing the site and installing the wall box

The installation of the MLC 52 must conform to national and local electrical codes and to the equipment’s size requirements.

Installation using a UL listed wall box is recommended for most mounting options, but mounting brackets can be used instead. To mount the controller using an electrical box and/or a mounting bracket, use one of the rough-in templates provided in appendix B, “Dimensions and Templates,” as a guide to measure and mark the hole in the wall or furniture through which the MLC will be mounted. The templates provide measurements for installing the control panel with either an electrical box or a mounting bracket.

The templates are not to scale and are provided for reference only.

•The MLC 52 models include a one-gang plastic faceplate, which can be installed on a standard one-gang electrical wall box that is at least 1.75" deep. Mud rings are also included.

•The MLC 52 VC models have two-gang plastic faceplates, which can be installed in a standard two-gang wall box. Mud rings are also included.

•Also available are optional faceplates that accept the MLC 52 and can be installed into one-gang or two-gang electrical wall boxes or directly mounted into furniture. Templates for these optional faceplates are included with each faceplate.

MLC 52 Series MediaLink Controllers • Installation 2-3