How do you measure amperage across fuse?

Answer 1

Technically, you don't measure amperage ACROSS a fuse, you measure current THROUGH a fuse, and the units of measure are amperage. If you want to measure the current though a fuse on a single device, say a TV, or computer, you can use a multi-meter. You will need to 'redirect' all the current so it goes through the multi-meter. ie:

----|fuse|---|device|---

would be rewired to be:

----|fuse|-----|black probe|---|multi-meter|---|red probe|-----|device|------

If you want to measure the current through a larger fuse, like the main fuse in your house, you'll need a current clamp. This is a clamp that you can put on ONE of the incoming power wires. It measures the magnetic field generated by the current. This is the much easier way since you don't have to do any re-wiring to redirect the current, but costs more money.

----|fuse|---@@---|device|---

[the @@ is the current clamp, note that it doesn't matter where the current clamp is placed, so long as it's only around ONE wire]

Whatever you do, be careful, electricity is dangerous.