Power Logging & Maximum Demand Studies Sydney
Real, measured load data — not guesswork — before you commit to a supply upgrade, an EV charger install, or respond to a distributor.
Before spending on a bigger supply, a three-phase conversion or an EV charging setup, it pays to know what your property or business is actually drawing. High Demand Electrical installs data loggers on your switchboard, records real demand over a representative period, and analyses it against the AS/NZS 3000 maximum demand tables — giving you an evidence-based answer instead of an assumption.
Before spending on a bigger supply, a three-phase conversion or an EV charging setup, it pays to know what your property or business is actually drawing. High Demand Electrical installs data loggers on your switchboard, records real demand over a representative period, and analyses it against the AS/NZS 3000 maximum demand tables — giving you an evidence-based answer instead of an assumption.
New Electrical Connections
AS/NZS 3000 Maximum Demand Tables
AS/NZS 3000 Appendix C sets out the standard method for calculating maximum demand — the tables and diversity factors used to estimate the peak load a supply needs to carry. Logged data either confirms that calculation or reveals where real-world use differs from the theoretical figure, which matters most when planning a switchboard upgrade, a three-phase conversion, or responding to a commercial electrical compliance requirement.
If you just need a quick theoretical figure rather than a logged study, start with our free maximum demand calculator before booking a full power logging job.
If you just need a quick theoretical figure rather than a logged study, start with our free maximum demand calculator before booking a full power logging job.
New Electrical Connections
Common Reasons To Log Power and Study Maximum Demand
Most people only think about actual demand once someone asks them to prove it.
1
Planning a supply upgrade
Confirming genuine demand before paying for a 200A, 400A or three-phase upgrade you may not fully need.
2
EV charger & equipment feasibility
Checking whether existing capacity can absorb a new EV charger, HVAC plant or major appliance before installing it.
3
Compliance & defect responses
Providing measured evidence when a distributor or compliance report questions your load.
4
Disputed capacity assessments
Backing up a case with real data rather than a theoretical calculation alone.
For a quick theoretical estimate rather than a full logged study, our free maximum demand calculator applies the AS/NZS 3000 tables directly — useful for a first pass before deciding whether a full study is worthwhile.
New Electrical Connections
How High Demand Electrical Runs a Power Logging Study
Site Assessment & Logger Install
We install a certified data logger on your switchboard, sized to capture every relevant circuit or the main supply as needed.
Logging Period
The logger records current, voltage and demand continuously, typically for 7 days to capture a full weekly load cycle including weekends.
Analysis Against AS/NZS 3000
The logged data is compared against the maximum demand tables in AS/NZS 3000 Appendix C to assess actual versus theoretical capacity.
Report & Recommendation
You receive the raw logged data plus a written report with a clear recommendation — upgrade, no upgrade needed, or further investigation.
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Which Study Fits Your Situation
Quickest option
Quick Load Check
A theoretical first pass using AS/NZS 3000 tables, no logger installed.
- Instant, desk-based estimate
- Good starting point before a full study
Most Common
Standard 7-Day Power Log
A full week of logged, measured data covering weekday and weekend load.
- Certified data logger installed on site
- Written report with recommendation
- Suits most homes & small businesses
Most thorough
Extended Seasonal Study
Pole, pillar and connection point all move — typically for a rebuild or major site change.
- Captures genuine peak periods
- Suits commercial & industrial sites
- Strongest evidence for distributor disputes
Fully Licensed
Our Energy Providers
Authorised by Sydney's major networks
Related Services
Related Power Infrastructure Services
Power Logging
Moving the meter itself when the connection point changes.
Maximum Demand Calculator
A free AS/NZS 3000 theoretical demand estimate.
Power Supply Upgrades
Where a study most often leads once more capacity is confirmed as necessary.
Switchboard Upgrades
New boards sized to the demand your study actually measured.
Single-Phase to Three-Phase Upgrade
Often the outcome when a study shows single-phase capacity is exhausted.
Commercial Electrical Compliance
Where logged data is often required as supporting evidence.
Strata Main Switchboard and Consumer Mains
What’s Included in a Power Logging & Maximum Demand Study
Site Assessment
Confirming which circuits or supply points need logging before installing anything.
Data Logger Installation
Certified logging equipment installed and secured on your switchboard.
Logging Period
Standard 7-day log, extended where a seasonal or variable load needs a longer window.
Data Retrieval & Analysis
Logged results compared against AS/NZS 3000 maximum demand tables.
Written Report
Clear findings and a recommendation you can act on or hand to a distributor.
Follow-on Upgrade Works
If the study shows an upgrade is genuinely needed, HDE can scope and deliver it directly.
New Electrical Connections
Why High Demand Electrical
High Demand Electrical is a Level 2 ASP accredited electrical contractor (EC Licence 397193C), certified to the ISO 9001, ISO 45001 and ISO 14001 standards. We install the data logger, run the analysis against AS/NZS 3000, and hand over a clear written report — and if the result points to a supply, switchboard or three-phase upgrade, the same team can scope and deliver that work directly.
We service homes and businesses across Sydney, and every study starts with a proper site assessment rather than a one-size-fits-all quote, since what's actually worth logging and for how long depends entirely on the property and what triggered the request.
We service homes and businesses across Sydney, and every study starts with a proper site assessment rather than a one-size-fits-all quote, since what's actually worth logging and for how long depends entirely on the property and what triggered the request.
Frequently Asked Questions
FAQs
What is power logging and why would I need it?
Power logging installs a data logger on your switchboard to record actual current, voltage and demand over a set period, usually a week. It replaces guesswork with real measured data, most often before a supply upgrade, EV charger installation, or when a distributor or compliance report requires evidence of actual load.
What's the difference between power logging and a maximum demand study?
Power logging is the raw data collection — installing the logger and recording load over time. A maximum demand study is the analysis that follows: comparing the logged (or calculated) demand against AS/NZS 3000's maximum demand tables to determine whether existing supply capacity is adequate or an upgrade is genuinely needed.
How long does a power logging study take?
A standard residential or small commercial log runs for about 7 days to capture a full weekly cycle, including any weekend load pattern. Larger commercial or seasonal sites sometimes need an extended log of several weeks to capture genuine peak demand periods.
Do I need a maximum demand study before a power supply upgrade?
It's strongly recommended. Upgrading supply capacity without first confirming actual demand risks either under-sizing the new supply or paying for more capacity than the site will ever use. A maximum demand study gives the load assessment behind any upgrade quote a solid, measured basis.
Can a maximum demand study help with a distributor dispute or defect notice?
Yes. Logged data is often the clearest way to demonstrate actual load to a network distributor, whether you're disputing a capacity assessment, responding to a defect notice, or supporting a connection application with real evidence instead of theoretical calculations alone.
Want To Know Your Actual Maximum Demand?
Every study starts with a proper site assessment before we confirm scope or pricing — what's worth logging, and for how long, depends on the property and what triggered the request.
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Powering Your Needs with Expertise
If you’re looking for a reliable, experienced, and prompt electrician, look no further than High Demand Electrical. We cater to all your electrical needs, from routine maintenance to emergency repairs and complete system installations. Our skilled team is committed to providing professional service that ensures your electrical systems run smoothly. Whether it's a small task or a large project, give us a call today. Let us meet all your electrical demands with the quality and reliability you deserve.
