What evidence do auditors commonly ask for on PS-07 Surveillance of operational and environmental parameters?

Building management system point list with the configured alarm thresholds; Temperature and humidity trend export for a sampled cold aisle; Alarm ticket showing routing to facilities and the time taken to return within range; Calibration certificates for the environmental sensors.

What is the most common gap auditors find on PS-07?

Thresholds set so wide that a genuine excursion never raises an alarm

BSI C5 (121-criteria catalogue) · C5: Physical Security

`PS-07` Surveillance of operational and environmental parameters

Continuously measure and regulate the operating parameters of technical utilities and the environmental conditions of the buildings, automatically informing the responsible departments when a value leaves the permitted control range so it can be returned promptly.

Source: BSI C5 (121-criteria catalogue), PS-07. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open BSI C5 (121-criteria catalogue) in the compliance library.

The edition of the catalogue is not stamped here; check the edition your attestation is issued against.

artefacts

held by a system

at each review

easy

to go live

SIEM / log platform

where the evidence lives

teal = a system already holds it · olive = produced at each review. To go live: easy when half or more of the artefacts are already held by a system, moderate from a quarter to a half, hard below a quarter.

These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.

system holds itEvidence a system already holds

Temperature and humidity trend export for a sampled cold aisle · SIEM / log platform
Alarm ticket showing routing to facilities and the time taken to return within range · Physical access / facilities

periodic reviewEvidence produced at each review

Calibration certificates for the environmental sensors · SIEM / log platform

governing documentDocuments that govern the control

Building management system point list with the configured alarm thresholds · Policy repository / GRC workspace

First move

Automate the pull from your SIEM / log platform. Retention and alert rules exported from the SIEM; review evidence is the closed-alert record with reviewer and time.

Common gaps auditors find

Thresholds set so wide that a genuine excursion never raises an alarm
Alarms routed to a mailbox that nobody watches outside working hours
Sensing limited to room level so rack level hot spots go undetected
No record of the corrective action that followed a logged excursion

Do this for your whole sheet

Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.

Build my evidence sheet

PS-06 Protection against interruptions caused by power failures and other such risks · PSS-01 Guidelines and Recommendations for Cloud Customers