S-3.1, r. 10 - Regulation respecting safety in Alpine ski centres

Schedule Disposition versions

2012-09-01

SCHEDULE 0.1

(s. 5.1)

MEASUREMENT PROCEDURE FOR LIGHTING LEVELS ON ALPINE SKI SLOPES

1.0 PURPOSE

This Measurement Procedure was designed to provide a methodology for measuring lighting levels on ski slopes in Québec so that they can be compared with the standard currently in force.

2.0 STANDARD

The vertical lighting of an Alpine ski slope accessible to Alpine skiers shall be at least 2 lux in any place on that slope, and the average vertical lighting of any 35m longitudinal segment of such slope shall be at least 5 lux.

The minimum vertical lighting measured in any place in a segment shall not be less than 1/10 of the average vertical lighting in that segment.

3.0 APPLICATION OF THE PROCEDURE

This Procedure provides a method enabling users to efficaciously test several segments of a slope and constitute a file comprising results with maximum precision.

4.0 CONDITIONS FOR VALIDITY

To ensure that the results are valid, the readings shall be taken during the period between 1 hour after sunset and 1 hour before sunrise.

5.0 TEST METHOD

5.1 MEASUREMENT GRID

The method uses a single 18-point measurement grid. The grid must be applied to a 35m longitudinal segment of a slope. It is important to measure this length on site and to take the measurements at the distances specified in Figure 1.

5.2 REFERENCE BAR FOR POSITIONING THE PHOTOMETER

The use of an inverted T-shaped reference bar is recommended for positioning the light-receptor cell of the photometer in accordance with the Procedure. The bar must meet the following requirements:

— it must form a 90º angle to the average gradient of the segment of the slope to be measured;

— it must be at a height of 1m.

See Figure 2.

6.0 TAKING MEASUREMENTS

All measurements must be taken in accordance with the criteria set forth in this Division. The precision and validity of the measurements cannot be guaranteed unless the method used complies with the requirements mentioned below.

6.1 METHOD

(a) Identify the point where the measurement is to be taken. It must be determined in accordance with the measurement grid used (Figure 1);

(b) Position the light-receptor cell of the photometer according to the following guidelines:

i. Angle of the photometer in the horizontal plane

The light-receptor cell of the photometer must form a 90º angle to the average gradient of the segment measured. It must therefore be positioned perpendicularly to the surface. Use a reference bar to position the photometer (or its light-receptor cell). See figure 2.

ii. Orientation of the photometer in the vertical plane

The light-receptor cell of the photometer must be oriented toward a point situated in the centre of the slope 35m uphill from the measuring point. See Figures 3 and 4.

iii. Height of the photometer

The light-receptor cell of the photometer must be positioned 1m above the surface of the snow.

O.C. 935-91, s. 8.