Category: Electrical Connections

June 20, 2022

Circuit Design – Expanded Kits

Electrical Connections

SnowMeltz Expanded System Circuit Design

In order to ensure proper load balancing on circuits, the SnowMeltz expanded kits have been designed to use combinations of mats on specific circuits:

SnowMeltz® Large Mat Kits

Heatizon Part Number Circuit
Number/
Amperage		 Mats Amps Per
Mat @ 240V		 Amps Per
Circuit @ 240V		 Mat(s) Square Footage Mat
Dimensions
SM-50W277-37W240-200 1 – 20A SM-50W277-37W240-100 15 15 100 2’x50′
2 – 20A SM-50W277-37W240-100 15 15 100 2’x50′
SM-50W277-37W240-220 1- 30A SM-50W277-37W240-50 7.7 17 50 2’x25′
SM-50W277-37W240-60 9.3 60 2’x30′
2 – 30A SM-50W277-37W240-50 7.7 17 50 2’x25′
SM-50W277-37W240-60 9.3 60 2’x30′
SM-50W277-37W240-240 1- 30A SM-50W277-37W240-60(x2) 9.3 19 60 2’x30′
2- 30A SM-50W277-37W240-60(x2) 9.3 19 60 2’x30′
SM-50W277-37W240-270 1- 30A SM-50W277-37W240-60 9.3 21 60 2’x30′
SM-50W277-37W240-75 11.6 75 2’x37′
2- 30A SM-50W277-37W240-60 9.3 21 60 2’x30′
SM-50W277-37W240-75 11.6 75 2’x37′
SM-50W277-37W240-290 1 – 30A SM-50W277-37W240-60 9.3 22 60 2’x30′
  SM-50W277-37W240-85 13.1 85 2’x43′
2 – 30A SM-50W277-37W240-60 9.3 22 60 2’x30′
  SM-50W277-37W240-85 13.1 85 2’x43′
SM-50W277-37W240-300 1 – 30A SM-50W277-37W240-75(x2) 11.6 23 75 2’x37′
2 – 30A SM-50W277-37W240-75(x2) 11.6 23 75 2’x37′
SM-50W277-37W240-320 1 – 40A SM-50W277-37W240-75 11.6 25 75 2’x43′
SM-50W277-37W240-85 13.1 85 2’x50′
2 – 40A SM-50W277-37W240-75 11.6 25 75 2’x43′
SM-50W277-37W240-85 13.1 85 2’x50′
SM-50W277-37W240-340 1 – 40A SM-50W277-37W240-85(x2) 13.1 26 85 2’x43′
2 – 40A SM-50W277-37W240-85(x2) 13.1 26 85 2’x43′
SM-50W277-37W240-370 1 – 40A SM-50W277-37W240-85 13.1 29 85 2’x43′
SM-50W277-37W240-100 15.4 100 2’x50′
2 – 40A SM-50W277-37W240-85 13.1 29 85 2’x43′
SM-50W277-37W240-100 15.4 100 2’x50′
SM-50W277-37W240-380 1 – 40A SM-50W277-37W240-60 9.3 30 60 2’x30′
SM-50W277-37W240-130 20 130 2’x65′
2 – 40A SM-50W277-37W240-60 9.3 30 60 2’x30′
SM-50W277-37W240-130 20 130 2’x65′

SnowMeltz® Jumbo Mat Kits

Heatizon Part Number Circuit
Number/
Amperage		 Mats Amps Per
Mat @ 240V		 Amps Per
Circuit @ 240V		 Mat(s) Square Footage Mat
Dimensions
SM-50W277-37W240-410 1 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
2 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
SM-50W277-37W240-615 1- 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
2- 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
3- 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
SM-50W277-37W240-820 1 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
2 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
3 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
4 – 40A SM-50W277-37W240-75 11.6 32 75 2’x37′
SM-50W277-37W240-130 20 130 2’x65′
SM-50W277-37W240-1040 1 – 50A SM-50W277-37W240-130 20 40 75 2’x65′
SM-50W277-37W240-130 20 130 2’x65′
2 – 50A SM-50W277-37W240-130 20 40 85 2’x65′
SM-50W277-37W240-130 20 100 2’x65′
3 – 50A SM-50W277-37W240-130 20 40 60 2’x65′
SM-50W277-37W240-130 20 130 2’x65′
4 – 50A SM-50W277-37W240-130 20 40 60 2’x65′
SM-50W277-37W240-130 20 130 2’x65′

Important: DO NOT OVERLOAD CIRCUITS!
Follow the load balancing chart to ensure the appropriate loads are on specific
circuits. It is also important to use properly sized breakers to be able to achieve the
desired amount of power required.

When installing SnowMeltz multiple mat systems, be sure to keep track of which mat is going to
the appropriate circuit. Mark the cold leads and/or note resistance to keep track.

The use of junction boxes may be required to extend cold leads back to either the activation
device or to the contactor panel. Extending/junctioning cold leads MUST be done in accordance
with the National Electric Code and any/all local codes. Be sure to note the amps per mat/circuit
in order to determine the appropirate conductor and junction box to use. Any junction box used
outside MUST be outdoor-rated.

Do not make ANY connections inside of the following activators:

  • M326A/2Z
  • M326ARS/2Z

All electrical connections for these devices MUST take place outside of the device, in a
outdoor-rated junction box with adequate space for all connections

Electrical Connections

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March 2, 2022

Electrical Connections

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The connection of the power supply and the activation device must be done by a qualified electrician in accordance with the National Electrical Code (NEC) and the Canadian Electrical Code (CEC). Refer to the wiring diagram included with the activation device and/or panel(s).

Electrical Requirements:

120 or 277 VAC — Single Phase
208, 240, or 480 VAC — Two Phase

The grounding shield from the Cold Lead(s) must be wired to Ground for all primary power installations. Section 426 of the NEC requires that each circuit to the heating cable be protected with a ground fault equipment protection devices.

Expanded SnowMeltz Kits have specific circuit design/load balancing requirements, please see: CIRCUIT DESIGN

Heatizon recommends that photographs of the installed heating cable be taken and/or hand drawings documenting the layout be completed prior to before installing the asphalt, concrete, pavers, stone or tile.

Forms
M326A Activation
M326ARS/-2Z Activation
Panel Installation
Other Activation Devices

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