Electrical Tester

Job Purpose

To carry out inspection, testing, verification, and certification of electrical submains in a commercial building, ensuring compliance with current wiring regulations, safety standards, and client specifications.

• Review drawings, schematics, and previous test results
• Identify submain routes, distribution boards, and protective devices
• Confirm isolation points and safe systems of work
• Carry out risk assessments and method statements (RAMS)
• Verify test equipment is calibrated and in date

Dead testing of submains, including:

• Continuity of protective conductors
• Continuity of ring circuits (where applicable)
• Insulation resistance testing (L-N, L-E, N-E)
• Polarity verification

Live testing, including:

• Earth fault loop impedance (Zs)
• Prospective fault current (PFC/PSCC)
• Phase sequence (for three-phase submains)
• RCD testing where applicable (trip times and currents)
• Verify correct conductor sizing, earthing, and bonding arrangements

• Visual inspection of containment, terminations, and labeling
• Check mechanical protection of cables and glands
• Confirm identification of phases, neutrals, and CPCs
• Verify compliance with BS 7671 (or local regulations)
• Identify defects, non-compliances, and limitations

• Accurately record test results
• Complete Electrical Installation Certificates (EICs) or Minor Works Certificates
• Produce snag lists and defect reports with classification (C1, C2, C3)
• Communicate findings clearly to project managers or clients
• Provide technical feedback where remedial works are required

• Follow safe isolation procedures at all times
• Use appropriate PPE
• Maintain site safety and housekeeping
• Comply with site rules and permit-to-work systems
• Ensure testing does not disrupt critical services without authorisation

• Strong understanding of commercial electrical installations
• Confident testing single-phase and three-phase submains
• Ability to interpret electrical drawings and schematics
• Accurate, methodical approach to testing and recording results
• Good communication and reporting skills

• NVQ Level 3 in Electrical Installation (or equivalent)
• 18th Edition Wiring Regulations (BS 7671)
• Inspection & Testing qualification (e.g. 2391 or equivalent)
• ECS / JIB card (where required)
• Experience in commercial environments

• Commercial buildings (offices, retail, schools, hospitals, industrial units)
• Working around live systems, plant rooms, risers, and distribution boards
• May involve out-of-hours or phased testing