When You Need It
- · A route passes near a boundary, dwelling, footpath or workplace and exposure has to be demonstrated
- · A planning condition or a client specification sets a field limit
- · A third party asset owner has raised EMF as an objection
- · Two route options are being compared and field is one of the deciding factors
Standards Applied
ICNIRP guidelinesIEC 62110CIGRE TB 373
The report states the clause and the edition it works to, so the calculation can be reproduced by whoever reviews it.
What You Get
Field magnitude at the points of interest, for the circuit loading stated
Lateral profile across the route, so the distance at which any limit is met is visible
The comparison against the applicable public and occupational limits
Where a limit is approached, the mitigation that works: formation, depth, spacing, or screening, with the effect of each quantified
Frequently Asked Questions
What current do you assess at?
Normally the maximum continuous rating, because that is the defensible worst case, and we will also report at the expected operating current if that is useful for the conversation with a third party.
Does formation make much difference?
Yes, a large one. Trefoil produces markedly less external field than flat formation at the same spacing, because the three phases sit closer to cancelling. It is often the cheapest mitigation available.
The Rest of the Cable Chain
Review, calculation, drawings, testing and fault location, from one place. See the whole picture.