I would like to protect my home network setup with surge protectors.

The products I am looking at are:
APC Essential SurgeArrest 5 outlets 230V
APC ProtectNet standalone surge protector for 10/100/1000 Base-T Ethernet lines
APC ProtectNet standalone surge protector for analog/DSL phone lines (2 lines, 4 wires)

Here is the suggested configuration: enter image description here

Here is the configuration I want to use: enter image description here

As you can see I want to use one protector on the phone line (ADSL internet) and one protector on the ethernet network. All of this will be powered from the 5-way power strip indicated above.

In my research I've read that "chaining" surge protectors is not recommended due to the devices interfering with each other. As you can see below the fault ratings and mode of protection differ between the devices, so I'm not sure if this is an issue?

Here are the fault ratings:

| ProtectNet Model |          Mode         | Standoff voltage | Breakover voltage |  Let-through voltage | Peak surge current |
| PNET1GB          | Line-line Line-ground | 6 Vdc 1,500 Vrms | 60 Vdc 1,800 Vrms | < 50 Vpk < 4,000 Vpk | 6,500 A 250 A      |
| PTel2            | metallic longitudinal | 220 Vdc 200 Vdc  | 260 Vdc 260 Vdc   | < 325 Vpk < 325 Vpk  | 150 A 150 A        |

Does my configuration count as chaining? Will I get better protection using both devices or should I just pick one?

  • In that scenario, it's not clear why you have to protect the ethernet network unless there are other ethernet drops to other computers that aren't protected by the power surge protection. That said, if you're trying to protect yourself from lightning, consumer surge protectors give limited protection from lightning strikes. There is a very small margin between a surge that's big enough to cause damage but small enough to be shunted away by a surge protector, and one that's going to fry your equipment and the surge protector, the best protection is to unplug equipment during storms.
    – Johnny
    Feb 13, 2015 at 17:46
  • @Johnny Yes the primary reasoning is indirect lightning. Lost the above setup last weekend (without the surge protectors). Only the ethernet port on the PC failed - so it couldn't have been that strong. The ADSL modem is cheap, the ethernet network not, so trying to "double up". I have surge protectors on all my plug points already, the phone line was the only way "in". I stay in the Highveld, South Africa which has some of the highest strikes/km2. Lesson learnt.
    – dequadin
    Feb 13, 2015 at 18:37
  • I think chaining refers to using two protectors of the same kind conected in series. In your case, it looks ok to me to use one adsl and one etherner protector.
    – Dan
    Feb 15, 2015 at 7:06

1 Answer 1


As explained in this Electronics.SE article, daisy chaining of AC power protectors, where they both attempt to protect the same electrical circuit, can cause interference and failure. But that's not what you're doing. You have 3 protectors, for electricity, ethernet, and phone/DSL respectively. Those are 3 separate circuits, even if some of them flow into the same devices, so your setup is fine.

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