If an HT electric line is crossing your residential plot in Pondicherry, you should first formally approach the Electricity Board authorities, ideally the Executive Engineer, with a written application and supporting documents like title deeds and photos. If this doesn't resolve the issue within a reasonable timeframe, consider escalating the matter to an Electricity Adalat or grievance redressal forum. While legal action like an injunction suit is an option, it can be a lengthy process. It's also worth investigating if the line was erected with your consent or if compensation was provided, as shifting lines laid for public purposes can be challenging.