Electrical contractors are sometimes picky but a customer needs to challenge the statement "Professional Installation". This is 100% legaleeze.
"Please define in legal terms your definition in legal detail of exactly what constitutes "professional" installation. Please list any and all universally recognized certificates of accepted compliance, definition of terms and conditions, with annotations and footnotes of reference to amplify concisely the comprehensibility of your warranty"
Thank you.
Fight hazy legal definitions with concise interrogation