HV Commissioning Engineer 9 month contract £600/day - Outside IR35 Hertfordshire - site-based RESPONSIBILITIES: * Carry out testing and commissioning of HV electrical equipment * Support commissioning activities across substations and distribution networks * Test switchgear, protection systems and associated electrical plant * Complete commissioning procedures, test sheets and technical documentation * Identify faults and resolve commissioning issues * Ensure work complies with approved procedures and safety requirements * Liaise with project managers, engineers and site teams * Support energisation, handover and completion activities SKILLS / REQUIREMENTS: * Proven HV testing and commissioning experience * Experience across 11kV, 33kV and/or 132kV networks * Knowledge of substation equipment and protection systems * Ability to interpret electrical drawings and technical documentation * Experience completing commissioning records and test reports * Strong understanding of electrical safety and safe systems of work CERTIFICATIONS: * Relevant HV authorisations and electrical safety qualifications DESIRABLE: * UKPN network experience * Protection and control testing experience * Experience commissioning newly installed substation equipment