Specifications

B-ﬁeld Exposure From Induction Cooking Appliances 34

diameters of standard cooking vessels are: 110 mm, 145 mm, 180 mm, 210 mm and 300 mm. The

hobs are operated in turn at the highest power setting, with all other cooking zones uncovered.

The measurements are made after stable operating conditions have been reached. If no stable

conditions can be reached, an appropriate observation time (e.g., 30 s) shall be deﬁned to be

sure to get the maximum value with ﬂuctuating ﬁeld sources.

Implementation of EN50366 in this study The B-ﬁeld exposure from the three appliances

was assessed according to the operating mode given in EN50366, but with minimal adaptations.

The measurements were made along vertical lines at a distance of 30 cm from the edges of the

appliance (see Figure 23), but also at measuring distances of 1, 5 and 10 cm. The front, rear,

left and right sides of the appliances (see Figure 6) were assessed: additional measurements

were also made at the rear of the appliance, since modern kitchens often feature cooking islands

which allow the cook to access the hobs from all sides. For these experiments, the standard

set of pots was used (pots 3, 14a, 14b and 13, with bottom diameters of 22 cm, 18 cm, 18 cm

and 14.5 cm, respectively, see Figure 9). The pots used were not made of enameled steel but

of stainless steel, which is the most common vessel type available for induction cooking on the

market. For each single-hob measurement the pot of corresponding size was ﬁlled to 50 % of

its capacity with tap water and centered on the hob. Lids were placed on the pots to achieve

more stable conditions during the measurements, and to prevent excessive evaporation in the

laboratory. The measuring range along the z-axis was [−0.4...0.4 m] for appliances 1 and 2, and

[−0.7...0.3 m] for appliance 3, due to the ﬁnite travel of the DASY4 robot arm. For Appliance

3, the measurements according to EN50366 were performed using pots 3 and 13 (largest and

smallest pots of the standard set of pots, see Figure 9), since no vessel was recommended in the

instructions and no cooking zone was marked on the appliance. The only relevant information

given in the Inducs manual is to use a pot with a minimum diameter of 12 cm. The B-ﬁeld

measured for all three appliances was compared to the ICNIRP limit, which is 6.25 µT for

general public exposure. The results are presented below.

5.0.2 Appliance 1

The B-ﬁeld measured in the vicinity of appliance 1 is shown in Figures 24 (front and rear sides)

and 25 (left and right sides). The B-ﬁeld does not exceed the ICNIRP limit (6.25 µT) for a

measuring distance of 30 cm according to EN50366.

Figures 24 a) (hob 1, front side) and 24 g)(hob 3, rear side) show that the ICNIRP limit is

exceeded for a measuring distance of 1 to 5 cm.

5.0.3 Appliance 2

Figures 26 (front and rear sides) and 27 (left and right sides) depict the B-ﬁeld measured in the

vicinity of appliance 2. The B-ﬁeld does not exceed the ICNIRP limit (6.25 µT) for a measuring

distance of 30 cm according to EN50366.

Figures 27 c) (hob 3, left side), 27 e) (hob 1, right side) and 27 h)(hob 4, right side) show

that the ICNIRP limit is exceeded for a measuring distance of 1 to 5 cm. In Figure 27 f)(hob 2,

right side), the ICNIRP limit is exceeded for a measuring distance of 5 to 10 cm.