Is it dangerous to disconnect it by myself, or is the standard protective gloves and shears sufficient?
The cable was installed by Time Warner Cable company, and now we no longer have their service.
How to disconnect a TV cable that runs all along the walls throughout the house
cables
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I believe it is splitting the signal, each output will have a specific loss associated. Some splitters will unevenly split the signal (commonly called a tap), which is handy to give a better signal to a longer run or to the cable modem. You can get a straight through connector at any HI store. That said, even these will have some loss of signal, just no where near as much as from a splitter.
Note: Common Insertion Loss per output leg on passive splitters:
- 2-way - 3dB
- 3-way - 4.8dB
- 4-way - 6dB
3dB is 1/2 the signal strength, basically on a two way splitter, full power goes in, 1/2 comes out each leg as long as there is termination impedance on all (cable or terminator cap) ports.
It would appear that in Indonesia, most of your electrical systems are based on European standards, and both NYY and NYM refer to German VDE cable types.
- You are correct that plain PVC insulation is usually inappropriate for prolonged UV exposure.
- Both NYY and NYM cable variants are suitable for direct burial in the ground or in concrete (with the exception of shaken, vibrated or compressed concrete - source).
- NYY is available with a UV-stabilised black PVC outer jacket, making it suitable for direct exposure to sunlight. Check with your supplier.
Considerations for the use of ducting or armoured cable relate only to protection from mechanical stress, impact or interference that could pose a risk of electric shock and/or damage to the circuit.
According to FSC Global:
NYY cables are an economical solution to power and control wiring where mechanical protection is not required. Used both indoor and outdoor these cables are suitable for direct burial or through ducts, local regulations permitting.
If P = V x I then 3,100W at 220V requires a little over 14A.
I have the UK's BS7671:2008+A1 (2011; 17th Edition IET Wiring Regulations) with current-carrying capacity tables to offer some insight into cable sizing. Ambient outdoor temperatures in Indonesia average 28°C so the tables' assumption of a 30° ambient can be accepted.
The tables are not directly applicable to your situation but for armoured cable rated to 70°C as is NYY, Table 4D4A gives a capacity of 29A for two-core 2.5mm buried direct in the ground or in ducting as 29A. Even allowing for various factors such as higher ground temperature, thermal insulation by the concrete, and volt drop over 50m, you're more than exceeding 14A. A 16A or even 20A circuit breaker at the beginning of the run would ensure you're not exceeding the cable's capacity to the outbuildings.
Since the cable you specify is two-core I'll assume it's NYY-O and thus has no protective earthing (grounding) conductor. For safety, you may want to run three-core NYY-J, one core of which is for earthing. At a minimum, I would expect this cable run to be protected by a Residual Current Device (RCD; also known as a Ground Fault Circuit Interrupter or GFCI). This could be combined with the overcurrent protection offered by a fuse or circuit breaker in an RCBO, but it depends what is available from your local supplier.
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Best Answer
The co-ax TV cable in the house is considered "low voltage" and shouldn't pose a hazard to people (unless something is seriously wrong with the wiring, like it touching the mains somewhere).
First, I'd ensure that the cables in the house are disconnected from the cable service line. There should be a grounding block on the side of the house where the house's cable lines connect to the service lines. They may look something like:
Disconnect the "house" side cable from the block, and then cut or tear out whatever cable you'd like. After this disconnection, the line should not be energized at all. As GrecMac commented, it is a good idea to use a non-contact voltage detector to ensure that the cables do not carry a dangerous voltage.