PREVAROLow-current (ELV)Contracting & Decor
A technician testing an electrical control panel with a multimeter and a tablet
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Insights

Practical notes on security and building systems

Written for the people who buy, specify and run these systems. No product promotion, just the decisions that matter.

Two bullet surveillance cameras mounted on a building wall for optical coverageINSIGHT

How to specify CCTV so the footage is usable

Pixel density, DORI and why camera count is the wrong metric.

ReadA contactless smart card reader mounted beside an access-controlled doorINSIGHT

Your access cards can probably be copied

125 kHz, MIFARE Classic, DESFire and what to migrate to.

ReadAn engineer testing an electrical panel with a digital multimeter during preventive maintenanceINSIGHT

What a maintenance contract should contain

A checklist for PPM scopes, SLAs and reports.

ReadControlled door with a card reader between screened walls, in daylightINSIGHT

Fail-safe or fail-secure? Deciding door by door

Locks, power loss and fire alarm release.

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Send the drawings, the scope or just the address. We reply with the questions that matter, then a survey date.

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