Periodic inspection of a workplace's electrical installation isn't just good engineering practice -- it's a legal requirement. Even so, many businesses let these inspections lapse after the initial commissioning process. In this article, we explain why grounding measurement and periodic electrical inspections are necessary, how often they need to be carried out, and the risks of neglecting them.
The Legal Basis
Regulations tied to occupational health and safety law, together with electrical installation regulations, require a workplace's electrical system and grounding to be measured and reported at defined intervals. These reports are among the core documents authorities request during inspections, and in liability assessments following a workplace accident.
What Grounding Measurement Actually Tests
Grounding measurement determines how quickly and safely a fault current can be carried to earth in the event of a fault. A ground resistance reading above the accepted standard means fault current may not flow fast enough to trip the circuit breaker, raising the risk of electric shock or fire.
How Often Should It Be Done?
For general workplaces, grounding measurement and periodic electrical inspection should be carried out at least once a year. In environments with flammable, explosive, or combustible materials -- fuel stations, chemical storage, and similar -- this interval can drop to as little as six months. For newly commissioned facilities or those that have just increased capacity, the first measurement is an integral part of the commissioning process itself.
The Risks of Skipping It
Overdue or missing measurements can deepen an employer's liability in the event of a workplace accident, trigger disputes over insurance claims, and result in administrative fines during official inspections. Beyond that, a degraded grounding system quietly accumulates risk during day-to-day operation -- faults that would otherwise be caught early go unnoticed until they grow.
What's Checked During an Inspection
A standard periodic inspection covers ground resistance measurement alongside continuity testing of panels and equipment, insulation resistance measurement, and trip testing of residual current devices (RCDs). This comprehensive approach prevents any single weak point from being overlooked.
Periodic Measurement with Soctek
At Soctek, we carry out grounding resistance, insulation, and residual-current tests on site using accredited measurement equipment, and deliver results as reports compliant with the relevant regulations. Beyond one-off measurements, we track each facility's annual inspection calendar and proactively remind operators when the next measurement is due.