Buy it like an engineer.

For phones, lamps and chargers, 1000–1200J is plenty. For a computer, TV or AV stack, choose 2000J or more.

A joule rating is capacity, not protection level. The MOV inside spends part of its budget with every surge it absorbs, so a higher number buys more headroom and a longer service life before the protection is used up. How tightly a spike gets clamped on the way through is a separate figure — the VPR, measured under UL 1449, where lower is better.

A power strip only adds outlets. A surge protector adds an MOV circuit that clamps voltage spikes before they reach your gear. The check that matters is a UL 1449 listing — a joule number printed with no listing behind it has not been verified by anyone. No joule rating and no UL 1449 listing means it is just more sockets.

AWG measures wire thickness — lower numbers are thicker. A 15A strip should use 14AWG copper, which carries a full load without overheating. Bargain strips quietly substitute 16–18AWG or copper-clad aluminum, which runs hot under the same load.

Avoid it. Every added link raises resistance and overload risk, and daisy-chaining can exceed the first strip's breaker rating. Plug strips directly into the wall — if you need reach, buy a strip with a longer cord or a cord reel instead.

Until its joule budget is spent — every surge it absorbs uses some up. That can be years on a clean circuit or months in a storm-prone area. A protected-status light shows when the MOV is exhausted and the unit should be replaced.

No. A 1500W heater alone consumes nearly the entire 1875W rating of a 15A strip, and its sustained draw overheats shared connections. Heaters, kettles, and other high-watt appliances should plug directly into a wall outlet.

Look for a UL or ETL listing mark on the unit itself — for surge protection specifically, listing to UL 1449. An unlisted joule number is a marketing claim, not a tested rating. CRST displays every certification on the product page, with full certificates available on request.