How to size a server rack or network cabinet: what 4U, 6U, 9U and 42U mean, how deep it must be, wall-mount vs floor-standing, and what goes inside, with cabinets from R1,170.

Surge plug, surge multiplug, voltage protector or UPS? How each one protects your TV, fridge, PC and fibre router in South Africa’s summer storms, with prices from R31.