INSTALLATION AND SERVICE INSTRUCTIONS FOR MODEL 31X
EXPLOSION-PROOF HORN FOR USE IN HAZARDOUS LOCATIONS
SAFETY MESSAGE TO INSTALLERS
People’s lives depend on your safe installation of our products. It is important to follow all
instructions shipped with the products. This device is to be installed by a trained electrician who is
thoroughly familiar with the National Electrical Code and will follow the NEC Guidelines as well as
local codes.
The selection of the mounting location for the device, its controls and the routing of the wiring is to
be accomplished under the direction of the Facilities Engineer and the Safety Engineer. In addition,
listed below are some other important safety instructions and precautions you should follow:
• All effective warning speakers produce loud sounds, which may cause, in certain situations,
permanent hearing loss. The device should be installed far enough away from potential listeners to
limit their exposure while still maintaining its effectiveness. The OSHA Code of Federal
Regulations 1910.95 Noise Standard provides guidelines which may be used regarding
permissible noise exposure levels.
• Read and understand all instructions before installing or operating this equipment.
• Do not connect this unit to the system when power is on.
• Optimum sound distribution will be severely reduced if any objects are in front of the speaker.
You should ensure that the front of the speaker is clear of any obstructions.
• All effective warning speakers produce loud sounds which may cause, in certain situations,
permanent hearing loss. You should take appropriate precautions such as wearing hearing
protection.
• After installation, ensure that all bolts and threaded joints are tightened.
• Establish a procedure to routinely check the sound system for proper activation and operation.
• Provide a copy of these instructions to the Safety Engineer, operator(s) and maintenance
personnel.
• File these instructions in a safe place and refer to them when maintaining and/or reinstalling the
device.
Failure to follow all safety precautions and instructions may result in property damage, serious
injury, or death to you or others.
I. GENERAL.
The Model 31X Horn is an explosion-proof audible signaling device for hazardous locations and
provides a 100dB tone measured at 10-feet on axis.
II. INSTALLATION.
A. Unpacking.
After unpacking the Model 31X, examine it for damage that may have occurred in transit.
If the equipment has been damaged, do not attempt to install or operate it, file a claim
immediately with the carrier stating the extent of the damage. Carefully check all envelopes,
shipping labels and tags before removing or destroying them.
B. Mounting.
The horn has provisions (mounting lugs) for mounting on a rigid surface. Mount the unit on the
rigid surface with user-supplied hardware.
Ensure mating threads are clean and thread 3/4" pipe into the horn outlet box.
C. Electrical Connections.
WARNING
To avoid electrical shock hazards, do not connect wires when power is applied.
Wiring must comply with Article 500 of the National Electrical Code and the local authority
having jurisdiction.
1
