Surface Preparation

The surface on which the safety mat(s) will be placed should be flat, smooth and free of debris. Any debris left under the safety mat, in time, may work its way through the housing and eventually contact the electrode assembly. This may affect the mechanical switching of the electrode assembly and will provide a path for moisture to enter the safety mat. These conditions may lead to a safety mat failure.

Proper Care of the Safety Mat Cables

After the safety mat is in place, use care in routing the safety mat cables to prevent damaging the insulation or breaking the internal wires. Make sure that the cable passageways are free of burrs and sharp not to pinch the cable when the trim is tightened down. Unless extra precautions are taken to make a watertight connection, never make a cable splice at floor level where the presence of moisture is a possibility. Moisture present at a nonwatertight connection will work through the cable and into the safety mat (i.e. capillary action or wicking).

Safety Mat Mounting Trim

ANSI standard B11.19 also states that, "Whenever possible, the mat should be fixed in place in such a manner so as to prevent easy relocation or removal by the operator or other unauthorized personnel."

Perimeter trim can help with this requirement, but users need to be aware that not all perimeter trim is the same. Three of the most optimum types of trim include two-part perimeter ramp trim, blunt trim, and two-part joining trim. Two-part perimeter ramp trim holds mat in place and simplifies installation by providing an aluminum base with channels for running cables, and a snap-on PVC cover. Blunt trim is used where a mat needs to be secured in place, but the edge being secured does not present a trip hazard. Two-part joining trim is used to create an active area between two adjacent mats.