Control cabinet type 11-21-31-41 Tekmar Ground


Control cabinet 11 intended for max 3 x 2300W three phase heating cable applications
Control cabinet 21 intended for max 6 x 2300W three phase heating cable applications
Control cabinet 31 intended for max 9 x 2300W three-phase heating cable applications
Control cabinet 41 intended for max 12 x 2300W three-phase heating cable applications

This control cabinet is designed for heating cable ground installations under asphalt, paving and concrete.

This cabinet may be designed to special order for loads exceeding 10A per phase.


1 Main switch three-pole
1 Control switch, manual-0-automatic
1 Tekmar snow and ice melting regulator plus amplifier and moisture/temperature sensors
1/2/3/4 Contactor(s) 4 x 20A
1/2/3/4 ELCB(s), four-pole, 25/0,03A
1/2/3/4 Operating status indicator(s) for three phases
4/7/11/13 Circuit-breakers
1 Enclosure, Class IP55

This control cabinet is intended for wall mounting and cable entry is via all sides.

Putting into service

  • Put the ELCB toggle switch in the ON position.
  • Set all circuit-breakers to ON.
  • Turn the main switch to the ON position.
  • Check all the settings in the Eberle with the table found in the “Operation” section of the enclosed description.

How the snow and ice melting regulator works

The snow and ice melting regulator consists of a control unit and two ground sensors: one heated moisture sensor and one unheated temperature sensor. The heating element is switched on when the predetermined moisture and temperature values are reached, thus minimizing energy consumption, provided the correct adjustments have been made.

The control unit is supplied pre-programmed using a standard program which is suspended when you adapt it to suit your own needs with the help of various menus. If there is a problem, the unit may be easily reset to the standard program by pressing a key.

Adjustments available include temperature, moisture sensitivity, basic heating function, and heating after the sensor is dry.

Readings available include total operating time (resetable to zero), sensor temperatures, and fault messages if any part of the unit is not working properly. The ground sensors, which are embedded in the ground surface and level with it, are of two types: one monitoring for ground temperature and moisture, and one which is heated and so can detect frozen precipitation.

Connecting up

Connection of the cabinet is made to a 5-conductor system.

The 5 x 1,5 mm² supply cable (maximum 5 x 4mm²) is connected to the main switch of the cabinet and to the neutral and earth terminal blocks.

The heating coils are connected directly to the cabinet’s earth terminal block (G-G), to the neutral terminal block (terminal block 1), and to the outgoing phases L1 (terminal block 2), L2 (terminal block 3) and L3 (terminal block 4).

Each sensor lead (integral, 10m) may be jointed in a junction box using a screened 5 x 1,5mm² cable, up to a length of 50m (4-conductor cable may be used for unheated sensor).