Snow Melt And Deicing | Snow Melt Plaque (NEC Requirement) | SMP
In order to stay compliant with National Electric Code 426-13, WarmlyYours’ Snow Melt Plaque must be purchased and installed in coordination with a snow-melting system. The code states that embedded snow-melting equipment must be evident by the posting of appropriate caution signs or markings where clearly visible. Thus, this durable cast brass plaque can be easily installed in concrete or asphalt to indicate that the snow-melting equipment is located underneath the material. The plaque is 4” x 4” x 3/8” thick and includes a ¼” diameter x 2” long bolt and nut combination for anchoring.
Frequent Asked Questions
- What type of conduit should I use to bring power to the heating cables?
- <p>Each heating cable comes with a factory installed cold lead wire that must be routed through the rigid metal 3/4" conduit to a outdoor rated junction box where a simple wire nut connection can be made for the electrical hook-up.</p>
- Will I need a new / expanded electrical panel for my snow melting system?
- <p>Always confirm the power requirements with the electrician. Large snow melting systems usually require a new electrical panel or electrical service. Contact WarmlyYours for a quotation, indicating the actual power capacity available, and to obtain recommendations for reducing the power consumption. For example, opting for tire track coverage rather than installing the snow melting system over the entire driveway can dramatically reduce power requirements.</p>
- How much power does the snow melting system use?
- <p>Power requirements are measured in Amps and based on three factors: the watts per sq. ft. of the snow melting cable or mat, the area powered and the voltage used for the application. Our product is rated at 50 watts per sq. ft., so that is a constant factor. Most snowmelt projects are powered with 240V AC – not all, but most. The one factor that is always variable is the area to be heated/powered. That is based on your project. For a point of reference, let’s use the example above of a 350 sq. ft. concrete patio.</p> <p>The formula is (50 W/sq. ft. x area of 350 sq. ft.) / V (240V) = Amps, so 17,500 / 240V = 72.9 Amps</p>
- How much does the snow melting system cost to operate?
- <p>To calculate the system's approximate operating costs, multiply the total kilowatts of the system by the cost per kilowatt in your area. Let's use the example of a 350 sq. ft. of concrete patio (residential application), with 240 VAC.</p> <p><strong>Total Watts:</strong> multiply area in sq. ft. x 50 Watts<br>350 x 50 = 17,500 Total Watts</p> <p><strong>Kilowatts:</strong> (the unit in we purchase electricity) take the Total Watts and divide by 1000<br>17,500 Total Watts / 1000 = 17.5 Kilowatts.</p> <p><strong>Kilowatt Rate:</strong> use the national average of .12 cents per Kilowatt-hours so how much do we pay for 17.5 kWatts?<br>17.5 kW x .12 = $2.10 for every full hour of operation.</p> <p><strong>Hours of Operation:</strong> We use a typical 6 hour snowfall for our example.<br>$2.10 x 6 hours = $12.60 for that snowfall.</p> <p>All of this will vary due to "after-run time". "After run time" is where the system remains on extra hours after the snow has completed falling, to ensure complete pavement snow melting and drying.</p>
- How much does a snow melting system cost?
- <p>A snow melting system typically costs between $7.00 and $15.00 per square foot, not including a control. Control packages range from $250.00 and $1,500.00 per system.</p>
- What happens if the cable is damaged during the installation?
- <p>If a cable is damaged during installation, recheck the system for continuity and confirm the integrity of the insulation with a megohmmeter, or "megger" tester, referring to the installation and testing instructions. If the cable fails any of these tests, take the following actions: clear a 3 foot square working area around the damaged section of cable, and record the cable part number from the UL tag and the location where you purchased the product. Call WarmlyYours with the above information. WarmlyYours will provide further assistance and supply a splice kit suitable for repairing the particular cable.</p>
- May I cross or overlap the heating cable?
- <p>Never cross, overlap, or allow the heating cables to touch each other. Doing so will quickly cause a circuit failure due to excessive heat build up. Always follow the product instructions and/or design layout plan to ensure the cable is installed with the correct spacing required for proper operation.</p>
- May I cut the cold lead wires?
- <p>The electrician may shorten the cold lead wires during the installation. Any lead wire extensions/splices must be made in a junction box in accordance with the installation instructions, and must comply with all national and local electrical codes. Never cut the heating cable.</p>
- Can I cut the heating cable if it is too long for the application for which it was designed?
- <p>Never cut the heating cable. A heating cable will not work if it has been cut. If the heating cable is too long, call WarmlyYours to consult with a technician who will guide you in utilizing the additional length of cable.</p>
- How does the electric snow melting system compare to hot water tubing (hydronic) systems?
- <p>The material costs are similar. However, electric systems are easier to install, with fewer components and significantly lower maintenance costs. Electric systems will run for a shorter period of time to give the same level of performance but with much higher energy efficiency (typically 95%-98% efficient). Controls and sensors required for the two types of systems are very similar. Electric systems do not usually require slab insulation and do not create the concerns typically associated with hydronic systems. These concerns include, but are not limited to, return temperatures, flue gas venting, waterway shrinkage and property damage caused by leaking pipes or tubes.</p>