• du type de graines,
• de la vitesse d'avancement du semoir,
• du niveau des graines dans la trémie,
• du réglage du débit,
• de la pente du terrain,
• de l'état de la surface du sol (secousses).

Des essais facultatifs (voir annexe B) peuvent compléter la méthode
d'essai pour décrire l'influence des produits utilisés pour le
traitement et la distribution sur le terrain. Les essais obligatoires ne donnent
pas tous les cas de figures de la distribution réelle des graines sur
le terrain.

NOTE – La partie 1 de I’ISO 7256 traite des semoirs monograines (semoirs
de précision). (Voir I’ISO 3339/0 pour la classification.)

This document is also applicable to seeding systems where components for seed deposition in the soil, for seed metering and for seed storage are distributed between two or more linked vehicles.

This document deals with all significant hazards (as listed in Annex A), hazardous situations and events relevant to seed drills, when they are used as intended and under the conditions of misuse foreseeable by the manufacturer, excepting the hazards arising from

— electrostatic phenomena,

— external influences on electrical equipment,

— failure of energy supply,

— failure and/or malfunction of the control system,

— inadequate visibility from drivers'/operators' position,

— travelling functions (drive, braking, etc.),

— break down of parts rotating at high speed,

— equipment for loading seeds (and fertilizer), and

— moving parts for power transmission except for strength requirements for guards.

This document is not applicable to

— fertilizer distributors designed only for solid fertilizer application (covered in ISO 4254-8),

— maintenance or repairs carried out by professional service personnel, or

— to environmental hazards (except noise), and

— to seed drills which are manufactured before the date of its publication.

When requirements of this document are different from those which are stated in ISO 4254-1, the requirements of this document take precedence over the requirements of ISO 4254-1 for machines that have been designed and built according to the provisions of this document.

When requirements of ISO 4254-9:2008 are different from those which are stated in ISO 4254-1 the requirements of ISO 4254-9:2008 take precedence over the requirements of ISO 4254-1.

ISO 4254-9:2008 deals with all the significant hazards (as listed in Annex A), hazardous situations and events relevant to seed drills, used as intended and under the conditions foreseen by the manufacturer, excepting the hazards arising from external influences on electrical equipment, failure of energy supply, failure or malfunction of the control system, break-up of parts rotating at high speed, equipment for loading seeds (and fertilizer).

ISO 4254-9:2008 is not applicable to seed drills with integrated and inseparable powered soil-working tools.

It is not applicable to environmental hazards or electromagnetic compatibility; neither is it applicable to hazards related to maintenance or repairs carried out by professional service personnel.

It is not applicable to machines which are manufactured before the date of its publication.

Elle s'applique aux systèmes d'ensemencement de type à aspiration où les matériaux pulvérulents (fugitifs) des enrobages de semences peuvent se mélanger à l'air entrant du ventilateur (souffleur) et être évacués dans l'atmosphère.

ISO 17962:2015 ne s'applique pas aux :

– systèmes de transfert situés entre un réservoir central et des boitiers distants permettant la distribution, par lesquels l'air est expulsé, et

– systèmes de transfert où le doseur est situé sur un réservoir central et où l'air est évacué vers le dispositif d'ouverture du sillon.

Les principes de conception de la présente Norme internationale ne sont pas applicables aux semoirs pneumatiques qui ont été fabriqués avant sa date de publication.

NOTE Les prescriptions nationales ou locales pouvant être plus rigoureuses peuvent s'appliquer.