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


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

This control cabinet is designed for heating-cable installations in gutters and downpipes, at bases of roofs, and on roof surfaces and ice melting.

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


1  Main switch 3-pol
1 Control switch, manual-0-automatic
1 Tekmar regulator consisting of control unit including gutter and temperature sensors
1/2/3/4 Contactor(s), 4 x 20A
1/2/3/4 ELCB(s), 4-Pole 25/0,03A
1/2/3/4 Operating status indicator(s) for three-phases
4/7/11/13 Circuit breakers
1 Enclosure, 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 sensors: one heated gutter 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 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 (resettable to zero), sensor temperatures, and fault messages if any part of the unit is not working properly. The heated snow and ice sensor is mounted in the gutter, between or next to the heating-cable runs but not in direct contact with them. The temperature sensor is mounted against the outside of the gutter or in some other shaded location near to where the heating-cable installation is.

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 50 meter (4-conductor cable may be used for unheated sensors).