How to Choose a CCTV System for Home & Office

CCTV systems are becoming more and more commonplace, with both public entities and private societies and individuals increasingly opting for them. Having recently installed a CCTV system in our apartment, I thought of sharing some useful pointers that will help the readers make a more informed choice.

First and foremost, it is essential to know the basic components of a typical CCTV system, namely the following:

  1. Cameras (can be analog, digital/HD or IP)
  2. Cabling, to carry video from the cameras to the DVR
  3. Digital Video Recorder (DVR) or Network Video Recorder (NVR), to process and record the video feeds
  4. Hard Disk Drive (HDD), to store the captured video feeds
  5. Power Supply module, to power the cameras (optional)


Here are some of the key points to consider when purchasing and installing a CCTV system for your apartment:

1. Choosing the right equipment

a) Cameras

  • CCTV cameras are of 3 types:
    • Analog cameras – They record video in analog format. Their resolution is measured in TVL (Television Lines), such as 600 TVL or 720 TVL (960H) (see this link to know the relationship between TVLs and pixels).
    • Digital/HD cameras – They record video in HD resolution, such as 1.3 MP or 2 MP, but transmit it in analog format over coaxial cables. Various encoding formats are supported for sending the video to the DVR, such as HD-CVI, HD-TVI, HD-SDI, etc. with HD-SDI being the best.
    • IP (Internet Protocol) cameras – They also record video in HD resolution, but use Cat 5/5E cabling to transmit the video in digital format. Due to this, IP cameras can support much higher resolutions than HD cameras.

Analog HD CCTV formats

  • Analog and digital/HD cameras are recommended for homes, apartments and smaller stores. IP cameras are more suitable for offices and large stores as they usually have a pre-existing LAN infrastructure that can be leveraged for CCTVs as well.
  • Quality wise, digital/HD and IP cameras are far superior to analog cameras. Digital/HD cameras have an added advantage in that they use the same coaxial cables as those used by analog cameras, which saves on costs if upgrading from an existing analog CCTV system. As far as possible, go for HD or IP cameras with minimum 1.3 MP or 2 MP resolution.
  • Analog cameras are obsolete, and even the highest resolution models (720 TVL/960H) cannot compete with HD or IP cameras. If you still decide to opt for analog cameras, ensure that the resolution is 600 TVL or more.
  • Regardless of technology (analog, HD or IP), all CCTV cameras come in two form factors:
    • Bullet cameras – Designed primarily for outdoor use.
    • Dome cameras – Recommended for indoor use.
  • Most cameras today are Infra-Red (IR) enabled, meaning they can record in the dark. Ensure that the camera you buy has this capability.


  • The DVR/NVR must be chosen depending on the camera type:
    • Analog DVR – Meant for analog cameras. For best results, the DVR must support the full resolution (TVL) of the camera.
    • HD DVR – Meant for digital/HD cameras. Again, ensure the DVR supports the video resolution and format used by the HD camera (HD-CVI, HD-TVI, HD-SDI, etc).
    • NVR – Meant exclusively for use with IP cameras.

CCTV camera resolution

  • DVRs/NVRs typically come with 4, 8 or 16 ports/channels. Each port can connect to one camera. Always retain a few spare ports for future additions, so that you don’t have to replace the DVR or purchase a new one just to add an extra camera in future.

c) HDD

  • Buy a HDD that has adequate capacity to store at least 1-2 weeks of video data. A 1 TB capacity disk is adequate for 8-10 cameras, but a 2 TB disk can also be used.
  • Most importantly, buy a surveillance grade HDD designed for continuous operation and not a regular HDD designed for PCs as it will wear out faster.

d) Cabling

  • For analog cameras, coaxial cables are the norm, but Cat 5/5E cables with Baluns can be used in certain cases. The specific cable to be used depends on the distance between the DVR and camera:
    • For cable lengths below 250 metres, a RG59 coaxial cable (left in below image) is adequate.
    • For cable lengths over 250 metres, a RG6 coaxial cable (middle in below image) should be used as it has less signal degradation and is less susceptible to external interference.
    • For cable lengths over 500 metres, a RG11 coaxial cable (right in below image) must be used as it gives even better signal integrity than RG6.
    • If power is drawn from a common power supply, Siamese coaxial cables must be used (RG59+2 or RG6+2). These have two wires for carrying power, in addition to the coaxial cable.

Coaxial cables RG59 RG6 and RG11

  • For digital/HD cameras too, the same coaxial cables can be used (subject to the above distance restrictions). This is a signficant advantage of HD cameras, especially if upgrading from an existing analog CCTV system.
  • For IP cameras, only Cat 5/5E (Ethernet) cables are supported, as these cameras transmit video in Ethernet format to the NVR.

NOTE: For analog and digital/HD cameras (except HD-SDI), Cat 5/5E cables with Baluns can be used if there are multiple cables running together and cable lengths are long. This scheme provides comparable video quality to RG6/RG11 while cutting cable costs, since a single Cat 5/5E cable carries 4 camera feeds and can replace 4 coaxial cables. But do ensure to use a good quality Balun to avoid deterioration in video quality.

2. General installation tips

a) Positioning of cameras

  • Basic CCTV cameras have a low resolution and do not give good visibility at long distance. So try to install cameras at locations where you can capture the faces of people coming and going at short range. The ideal location is in front of all the lifts and staircases on the ground floor or basement, as all visitors and residents inevitably pass from here on their way in and out.
  • You can also put additional cameras to cover the main entrances to the apartment, such as the front gate. This way, you can also keep a tab on the security staff and verify if they are doing their job properly. You can also check what stuff people carry on the way in and out.
  • Most importantly, don’t try to focus cameras on the perimeter walls as that is useless unless someone is actively monitoring the camera feed in real-time. Moreover, it will not yield any actionable data in case of theft; at best you will see blurry images of someone entering and exiting over the walls.
  • As far as possible, try to install the cameras well above body height so that they are not easily accessible by hand.

b) Location of DVR/NVR

  • It is very important to ensure that the DVR is kept in a safe place. You don’t want the DVR itself to be stolen during a theft!
  • Keeping safety in mind, do also try to choose a central place for installing the DVR with respect to the planned placement of cameras, as this will reduce overall length (and cost) of cabling.
  • If IP cameras are being used, location becomes less important, as a single Ethernet cable is adequate to carry the video feeds from all cameras to the NVR via an Ethernet switch (similar to how multiple PCs connect to a server over a LAN).

c) Power supply and backup

  • Ensure that the DVR/NVR has a backup power source (such as a UPS) to remain online during a power cut.
  • Analog and digital/HD cameras can be powered from a local power outlet or from a common power supply module kept near the DVR. Using a common power supply will increase cabling costs (as Siamese coaxial cables will have to be used instead of plain coaxial cables), but the advantage is that a single power backup and surge protection module can be used to protect all the cameras. If powering locally, ensure that the local power point has a backup power source.
  • IP cameras can be powered either from a local power outlet or via PoE (Power over Ethernet).

3. Maintenance tips

  • Ensure that the cameras are cleaned once a month, or else over time cobwebs can form on them and the cobweb movements in the wind can keep the cameras recording even if no other activity is taking place. This will prove to be a pain if you have to review the footage later. Ordinarily, when there is no activity taking place, the DVR doesn’t record the camera feed which makes it easier and faster to review the footage later.
  • If coaxial cables are used, you will probably need to replace them after about 5-8 years.
  • HDD will also need replacement after a few years due to wear and tear of constant operation.

Useful links



  1. daccess10daccess1003-07-2018

    Nice blog..Thanks for sharing such a nice information..

  2. Vineet ManchandaVineet Manchanda12-23-2017

    thank you for posting this explanation. it demystifies cctv tech to a good extent for the layman.

  3. mital shahmital shah12-16-2017

    very very useful tips…… thanks..
    wanted to know if i want to cut down cabling then do wireless cameras work good?

  4. VijayVijay11-28-2017

    Thanks Vijay for sharing a Useful Info.!

    Useful Tips.! Informative .!

  5. GirishGirish11-27-2017

    Dear Mr.Vijay,

    Very important and well written write up on CCTV. Thanks a lot, the world keeps going by people like you.. thanks


    Dear vijay,

    1. An excellent write up of the cctv for a layman, you have analyzed all aspects of the equipment and also gone into the various details, this is a must for all persons with little knowledge on the subject.
    2. Specially with the increasing crime rate, this would definitely help the senior citizen.

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  7. SundarSundar08-22-2017

    Vijay Ji,
    Does the camera do panning? Or will they be fixed in single direction?


  8. Abhishek PradhanAbhishek Pradhan07-20-2017

    Also I have a housing society of standalone building in not more than 10000 sqft area…can you please suggest which camera suits best for our society?

  9. Abhishek PradhanAbhishek Pradhan07-20-2017

    Hi Vijay, thanks much for taking the effort to put up such a nice and informative blog.

    I would be greatful if you could share your thoughts regarding the operating costs of IP camera vs conventional CCTV cameras (where we need separate power supply for each camera, DVR box, hard disk and TV/monitor display). I believe the the IP cameras with memory option would be more economical and less power consuming as we need to connect only the cameras to the supply thereby not inflating the electricity bills much. Please can you share your thoughts.

  10. vijay katkurivijay katkuri06-20-2017

    very informative
    thanks for explaining everything about cctv set up

  11. LakshmananLakshmanan05-12-2017

    Very informative.

    Is it possible to get rid of cables altogether using wifi? Is camera and DVR supports wifi? How is video quality? What will be range of coverage typically and is there any interference with other sources?


    Really very useful information thank u

  13. V.PrasadV.Prasad03-14-2017

    Dear Sir
    read ur article on CCTV with great interest. It was very informative. I am the Principal of a school in a remote location and would like to secure my school using the optimum CCTV configuration.
    Can you suggest some good outdoor cameras which can monitor areas from 75 meters to 50 meters.
    Based on ur experience kindly share the best configuration the school should go. Kindly include the names of the brands in your reply.

    Yours sincerely
    Jawahar Navodaya Vidyalaya
    Belpada, Bolangir

    • Vijay PadiyarVijay Padiyar03-14-2017

      Dear sir, the datasheets or manuals of different CCTV cameras will tell you the range of that particular camera. You can choose a model that has the range coverage that you want. Sorry I will not be able to recommend specific brands, you can do your own research and explore.

  14. B N BhushanB N Bhushan03-09-2017

    Hi vijay
    The information provided is very useful for a layman who wants to install cctv
    Thank u

  15. Rohan SharmaRohan Sharma03-07-2017

    Thanks Vijay,

    Great information, very helpful article.

  16. GopinathGopinath11-01-2016

    Hi Vijay, it was a very useful article indeed. Thanks a ton.

    Just curious to know, whether the cabling for power and data to the AHD camera from DVR has to be done separately? Does that have any advantage compared to same cable conducting both Data & power to cameras? Please throw some light on this.

    • Vijay PadiyarVijay Padiyar11-02-2016

      This is already mentioned in the blog post. You can draw power from a common power supply module or from a local power socket. In the former case you will need to use a special cable which has wires for both power and data in different sheaths (either RG59+2 or RG6+2). In the latter case you will need a socket next to each camera and a power adapter.

  17. AsaAsa09-07-2016

    Very good informative blog!!

    As you mentioned above video feeds can be accessible via internet from anywhere. So will there be charge applied on number of user accounts accessing it?

  18. VidyadharVidyadhar08-29-2016

    Your information on specifications is excellent, can you suggest brands ,that is for cameras, cables dvr’s supporting 80 cameras and monitor for installation in my residential apartment.

    • Vijay PadiyarVijay Padiyar09-06-2016

      Sorry, I do not recommend specific brands. You may do your own research and finalise the brand.

  19. James williamsJames williams05-04-2016

    Home security is on the top priority for every house owner. CCTV cameras are the best solutions for high security concerns. This post is very important for cctv installation tips, so it can help each house owner to install cctv cameras. Thanks so much for sharing this great post!

  20. Shilpa ShahShilpa Shah03-03-2016

    Hi, is it possible to view online from anywhere if we have login info??
    What we need if we can watch it online except login info??
    Please help

    • Vijay PadiyarVijay Padiyar03-04-2016

      It depends on whether the DVR/NVR supports accessing the feed via internet and the same is configured. If yes, then you can indeed view the video feed from anywhere. You will need the login details and may need to install an app if viewing from mobile. Depending on the model, you may either have to connect to the DVR/NVR itself or to the manufacturer’s website to view the video feed. All this would have been configured at the time of installation itself.

  21. padmapadma02-18-2016

    Thanks a ton for sharing this information, very useful article. Could your also let your views about the brands, model specification. This would really be of great help for amateur like me, who is struggling to get CCTV installed.

  22. SubaneshSubanesh01-22-2016

    Thanks for sharing…if possible please share the cost it took for setting up this in ur apartment along with specifications which can help us in benchmarking against any quotes we get from vendors

    • Vijay PadiyarVijay Padiyar01-23-2016

      Cost and specifications vary with time. All the information to make an appropriate choice is available here.

      • ShashikumarShashikumar02-16-2016

        We are planning to install CCTV camera to our apartment in NEW BEL ROAD. It should cover apartment entrance area and stair case,total feet to be covered 150 feet length & 45 feet width. Please share your thoughts for best CCTV camera and also help in the cost. Also suggest best dealer near by our location. Thanks.

  23. SalianSalian11-22-2015

    Thanks Vijay, I found your article on CCTV helpful…..

  24. Vikas jagdaleVikas jagdale10-12-2015

    Hello Vijay,
    Thanks for sharing a very crisp but all inclusive article on CCTV aspects to consider.

    Best regards,

  25. SantanuSantanu06-12-2015

    That’s a very detailed article in this topic. Home security solutions are must these days as city life is getting more risks. Mainly for ladies who are staying at home in day time.

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