What a load survey is
It is the mapping of the equipment and points of use the installation will serve: lighting, sockets, HVAC equipment, machinery and other loads, together with their power ratings and usage patterns.
Why it comes first
- It is the basis for sizing conductors, protective devices and distribution boards
- It allows for future expansion and spare capacity
- It helps establish whether an existing installation can take on new loads
NBR 5410
The Brazilian standard ABNT NBR 5410 covers low-voltage electrical installations and sets out design and installation requirements to ensure safety and proper operation.
NR-10
Brazilian Regulatory Standard NR-10 sets safety requirements for electrical installations and services, covering control measures and the training of those who carry out this work.
Documentation and the technically responsible professional
Electrical designs and interventions must have a qualified professional who is technically responsible. Document the survey, the assumptions and any changes, and keep the drawings up to date once the work is complete.
This content is for information only and does not replace the design, technical assessment or advice of a qualified professional. Standards may be updated; always check the version in force.
Frequently asked questions
Is a load survey necessary for renovations?
It is advisable: it shows whether the existing installation can support the new loads and guides any upgrades that may be needed.