The primary AC power is connected to a separate terminal strip 31/32/33 marked POWER in the lower right-hand corner of the motherboard. The three terminals are marked 31/L, 32/N and 33/ (protective earth). The power terminal 33/ is directly connected to the exposed metal parts of the indicating transmitter DTR. Wiring to the terminals must be of min. 1.5 mm2. The fuse voltage should be 250 V, max. size 10 A and fuse speed slow. Ensure that the protective fuse in the building system complies with local requirements.