Low-Frequency Electromagnetic Field Assessment
Comprehensive measurement of ELF magnetic and electric fields from power lines, wiring, and appliances, with comparison to building biology guidelines.
Book AssessmentUnderstanding Low-Frequency EMF
Low-frequency electromagnetic fields (ELF-EMF) are produced by anything carrying alternating current—power lines, building wiring, appliances, and electrical equipment. In Australia, the mains frequency is 50 Hz, and most domestic EMF exposure occurs at this frequency and its harmonics.
ELF magnetic fields penetrate most building materials and the human body freely. Research has linked elevated magnetic field exposure to increased childhood leukemia risk (classified as possibly carcinogenic by IARC), sleep disturbances, and other biological effects. Electric fields interact primarily with the body surface but can induce measurable body voltage.
Magnetic vs Electric Fields
Magnetic fields are generated by current flow and are difficult to shield. Electric fields are created by voltage and can be shielded by grounded conductive materials. A thorough assessment measures both field types, as they have different characteristics and mitigation approaches.
Common Sources
What We Measure
Our Standards
We report findings against Building Biology guidelines (SBM-2015) rather than ICNIRP limits, which address only acute thermal effects and ignore the substantial body of research on non-thermal biological effects. Building Biology guidelines recommend sleeping area magnetic fields below 20 nT (0.2 mG) for no concern, with levels above 100 nT (1 mG) considered elevated.
Wiring Issues
Elevated magnetic fields often indicate wiring problems—neutral-ground bonds, shared neutrals, or improper grounding. These issues not only create EMF exposure but can represent fire hazards. We recommend electrician evaluation when wiring anomalies are detected.