…cause a client asked…

There is no Utopia in lightning protection. Lightning may ignore every defense man can conceive. A systematic hazard mitigation approach to lightning safety is a prudent course of action.

http://www.lightningsafety.com/nlsi_lhm/lpts.html

The best you can do to protect yourself from lightning is to have all equipment and power single grounded and install a decent surge filter (or divertor) at your mains power panel. Note that if the house is situated in a dry or rocky area getting a good ground may be problematic. If you are in a heavy lightning area then a copper lightning rod (commonly called air terminals) may be prudent. On top of your low impedance, well-bonded equipotential ground system and mains power surge arrestor you may want to get (from Coretech of course) surge protectors for your computer and data equipment.

If you provide a list of the equipment that you will be using we can get a quote to you for surge protection equipment in your home office. If you want backup battery power included – please let me know how long you’d like to run what in a power outage.
“The importance of a single-point protection ground cannot be stressed enough. All equipment should be bonded to one single earth ground. If you have some equipment on one ground, and other equipment on another ground, it is quite likely that in a nearby strike that there will be a large voltage difference between the two grounds. This means that the equipment will be at different voltages, sometimes high enough to get arcing from one to another.

A Single Ground Rod is Seldom Enough: Tests done over the past few years show that in most cases, a single 6 or 8 foot ground rod is NOT enough, even when the ground is salted to improve conductivity. The problem is, in arid climates with dry soil, it could take as many as a dozen rods to get it down to the 10 ohms ground resistance that is usually accepted as the optimum (25 ohms is the NEC minimum). To get down to the 25 ohm NEC minimum, you may have to use 2-3 10 foot rods, all bonded together with #6 wire and copper wire clamps. However, if you cannot do this, something is better than nothing. In some cases you may have to go so far as to bury lengths of bare copper wire or copper pipe in trenches.”

http://www.windsun.com/Lightning_Protection.htm

Importantly you should also get the telephone circuit protected. Lightning striking 300 meters away will generate a large electro-magnetic field that will fry modems (and maybe computers) connected to phone and power lines – modems are especially sensitive to this. An external modem is usually a good idea (Apple USB External Modem at $79 is excellent value).

Most of the work to protect you from lightning strike should be done by a good electrician who knows the standards. Lightning strikes generate between 10,000 and 30,000 amps in a few microseconds so having a well grounded system is the first and most important step.