Choosing CCTV and Access Control for Commercial Sites

A CCTV system specified by camera count usually disappoints. One specified by what someone needs to see usually does not. The same applies to access control: the lock type is decided by the door and the fire strategy, not by the reader.

Define the objective, then choose cameras

Each camera has one of four jobs. Detect: know that someone or something is present. Observe: see general activity and behaviour. Recognise: recognise a known person or vehicle. Identify: identify an unknown person, or read a number plate, with confidence. Each level needs more pixels on the subject, which means a narrower field of view or more cameras.

Mark a floor plan with every point that needs coverage and the level required at each: entrances and exits, lobbies, lifts, cash or server rooms, parking, loading docks, perimeter. This map, not a rule of thumb, gives you the camera count. Perimeters often need detection, lobbies recognition, and gates identification.

Camera types, lens and resolution

• Bullet: fixed and visible, a good deterrent, common outdoors and for longer throws.
• Dome: discreet, often in vandal-resistant housings, suited to ceilings and corridors.
• PTZ (pan-tilt-zoom): covers large open areas such as yards and parking, but sees only one place at a time. It does not replace fixed cameras at entrances.

A wider lens covers more area with fewer pixels on each face. A narrower or varifocal lens reaches further. More megapixels help only if the lens and lighting support them, and they raise storage. Ask vendors for sample footage from a similar location at a similar time of day, and check low-light performance, wide dynamic range for entrances facing glare, the IP rating for outdoor use and an impact rating where vandalism is a risk.

Storage, NVR, PoE and cabling

The storage arithmetic

Storage is a calculation you can do before you buy. Get the bitrate for each camera in Mbps at the resolution, frame rate and codec you will actually use. The datasheet gives a range; the vendor’s configuration gives the real figure. One Mbps of continuous recording is about 10.8 GB per day (1 megabit per second, times 86,400 seconds, divided by 8 bits per byte).

Motion-based recording and modern compression such as H.265 lower the figure, but busy scenes cost more than quiet ones, so test against real footage. Retention days is your decision, driven by how quickly you would notice an incident and by any legal or contractual requirement; confirm the latter with your counsel. Use drives rated for continuous surveillance duty.

NVR, PoE and cabling

Choose an NVR with spare channels, enough drive bays and enough ingest capacity for the total bitrate. Keep remote access behind secure networking rather than exposed directly to the internet, change default credentials, and put cameras on their own network segment.

With PoE, the switch’s total power budget must exceed the sum of camera loads; IR and PTZ cameras draw more. Copper Ethernet runs are limited to 100 metres, so plan switches or fibre for longer distances. Put cabling in conduit and label both ends. Back up the NVR and switches with a UPS. For outdoor runs, ask about surge protection, since Bengaluru sees thunderstorms in the pre-monsoon months of April and May.

Cameras need light. Infrared helps in darkness but does not fix a badly lit entrance. Mount at a height that avoids tampering yet still shows faces, angle away from direct glare, and leave safe access for later cleaning and servicing.

Access control options and door hardware

A controlled door is a system: reader, controller, lock, exit button, door closer, door position sensor and a power supply with battery backup. Lock choice (electromagnetic lock, electric strike or electric bolt) depends on the door, the frame and the door’s fire rating, so confirm compatibility with your fire consultant and the door manufacturer.

Fail-safe, fail-secure and fire egress

A fail-safe lock releases when power is lost, as electromagnetic locks do. A fail-secure lock stays locked when power is lost, as many electric strikes do, and must still allow free exit by mechanical means. The rule that overrides preference: doors on escape routes must release when the fire alarm operates, and people must be able to leave without a key or credential.

Confirm the arrangement, including emergency release devices, with your fire safety consultant against National Building Code of India 2016, Part 4 (check the current edition). Integration is normally an output from the fire alarm panel that releases the access-controlled doors. Wiring and commissioning are for a licensed installer, and the release should be tested whenever the fire system is tested. Our note on quarterly fire and life safety checks covers the routine.

Privacy, signage and data protection

Place cameras where there is a legitimate need, not in washrooms or changing rooms. Put signage at entrances stating that CCTV is in operation and who to contact. Limit who can view and export footage, keep an access log, and define retention and deletion. Footage and biometric templates are personal data, and the Digital Personal Data Protection Act, 2023 may apply to how you collect, store and share them. Confirm your obligations with your counsel.

Maintenance and uptime

A camera that is not recording is worse than none, because it creates false confidence.

How SupplycZar can help

SupplycZar supplies security systems, and well-known brands such as Hikvision, CP Plus and Honeywell can be sourced subject to availability. Installation and upkeep are available through our security systems services, with scope confirmed against each site. Send the floor plan with the objective per area, retention days, the door list, existing systems and any brand preference or “equivalent to” lines through the RFQ form. For a wider view of how facility needs differ, see our page on corporate offices.