Short answer. Article 282 names serious misconduct, not misconduct generally, as a just cause for dismissal. The word 'serious' is part of the statute itself, so a minor or trivial rule violation does not automatically fit this specific ground, even though other listed causes in the same article could still apply depending on the facts.
What the law says
Termination by employer. An employer may terminate an employment for any of the following causes: Serious misconduct or willful disobedience by the employee of the lawful orders of his employer or representative in connection with his work; Gross and habitual neglect by the employee of his duties; Fraud or willful breach by the employee of the trust reposed in him by his employer or duly authorized representative; Commission of a crime or offense by the employee against the person of his employer or any immediate member of his family or his duly authorized representatives; and Other causes analogous to the foregoing.
Labor Code, Article 282 — Just Causes For Dismissal. Read the full provision →
The statute's own word choice sets the bar
Article 282 lists as a just cause serious misconduct or willful disobedience by the employee of the lawful orders of his employer or representative in connection with his work. The legislature did not write 'misconduct' alone; it wrote 'serious misconduct.' That qualifier is part of the operative text, and it signals that not every infraction of a workplace rule is treated as equivalent to the kind of conduct this specific clause addresses.
Willful disobedience has its own qualifiers too
The same clause covers willful disobedience, but again with conditions built into the text: the order disobeyed must be lawful and must be given in connection with his work. A minor lapse in following an instruction that is not clearly connected to the employee's actual duties, or that was not a lawful order in the first place, does not automatically satisfy this clause simply because some rule was technically not followed.
Where a minor violation might still matter
Article 282 lists other just causes beyond serious misconduct, including gross and habitual neglect of duties, fraud or willful breach of trust, and a closing category of other causes analogous to the foregoing. A pattern of small violations, repeated over time, could potentially be evaluated under one of these other grounds, such as habitual neglect, even where no single incident on its own would qualify as serious misconduct. Which ground, if any, actually fits is a factual question the bare text of the article does not answer for you.
What this article does not decide for you
Article 282 does not define exactly how serious an act of misconduct must be to cross the threshold the word 'serious' sets, nor does it list examples separating minor infractions from serious ones. It states the requirement in general terms and leaves the application to the specific facts of each case. What the text does establish clearly is that the word 'serious' is not decorative — it is a condition the statute itself imposes on this particular ground for dismissal.