You can plug a surge protector into an extension cord with the same surge-protection features.
The only consideration would be the length of the extension cord and that it is not a cheap, flimsy, thin cord because the amount of current drawn through it by your computer, monitor, peripherals, etc. A long inadequate cord could heat up by the current flowing through it.
Note that surge protectors usually are equipped with a substantial cord attached to them by the manufacturer.

Regards,
Fred

Interesting question which prompt me to look over the manual for my power strip. In reading over my manual for my APC surge protector there is no mention of the pros/cons of using a extension cord. So I guess common logic would prevail.

1. Make sure the extension cord is for three prong plugs. That way your assured that it is properly grounded.

2. Make sure the extension cord is rated for what you are using it for. In other words the computer, monitor and sound system can use quite a bit of electricity. Using too small of a cord with thin wires can lead to the extension cord becoming hot which is a fire hazard and can cause problems with the supplied voltage to your system. Look for an extension cord that is rated for appliance applications.

I use an extension cord , no problem. I did use a really heavy duty one that I just happened to have around.

if you are only runing 15 feet or less a 14/3 cord will do fine, how ever if your talking 20 or mor feet i would recomend you use a 12/3 cord just make sure that your cord is 3 prong DONT use a 3 to 2 ground adapter your surge pro. works on the same princable as a GFI receptial. with out that groung prong connected your system is most likely to die. M.C.

Hey there Michigan Cat thanks for the tip. I would have just used a plain ol', standard, lightweight jobber.

Does this mean I need to get one of those big, thick, long, orange extension cords? I don't really know what 14/3 or 12/3 means. I do understand about the three pronger deal, t hough. We do live in a 50year old house and I'll have to check the outlets anyway.
Sure appreciate your help.

Again, I say thanks for the tip, glad you had a good belly laugh at my expense. Although orange isn't an easy color to decorate with I would have suffered because I dont' want to blow up my house or fry the computer. I referred to ugly orange thing because it was the only way I could reference it. But hey, you taught me something new--again. I didn't know those hefty things came in designer colors. I'll look for black at Home Depot tomorrow.
tvbishop

Tvbishop, the 14/3 and 12/3 refers to the gage of the wire, (or the size of the copper wire inside the cable) your cords will usualy print this on the raper around the cord But if you look on the cord it self in FINE print tit will tell you the size of the wire inside and the type of cable 99% of the time .. .. no you dont haft to get an orange one (LOL) it depends on your room decore look arown there is red, brown yellow and my fav: black , black goes with every thing and it dont stand out like a sore thumb . hope this helps, cant help you out much on computers but i did do electral wireing for 30 years. (old electrians dont die , they just zap away) M.C.