BBC Sounds, Music, Radio, podcasts. Hello, this is the Grenfell Tower Inquiry podcast, reporting every day the inquiry sits. I'm Eddie Mayer. And today, the inquiry heard from expert witness Dr Duncan Glover. He's a specialist in electrical fires who's been investigating whether an electrical fault could have been connected with the start of the fire in flat 16 of Grenfell Tower.

There are a few clues which helped Duncan Glover narrow his search.

First, we know from previous evidence that the fire started in the kitchen of flat 16 on the fourth floor.

The person who discovered the fire, Bahaluk Abedi, who lived in Flat 16, talked about his fridge in his first 999 call, made at 1254.

By the free side, do you call, can you cook?

Yes, you wait outside.

I'm outside, I'm watching all says.

Okay, so the fire engines are on the way.

They will be there soon. We also know that Bahailukabedi switched off the main power supply to the flat before he left.

He did this on the fuse box, which Duncan Glover calls the consumer unit.

Counsel to the inquiry, Andrew Kinnear, asked Dr Glover about this.

Any device that was any other device at that consumer unit that was found in the off position

would have had to have operated before Mr. Capiti turned off the main switch.

When he turns off the main switch, the consumer unit is now de-energized

and there's no way that a circuit breaker could

operate automatically after he does that.

And so it provides us with a snapshot of the circuits that had been tripped before the fuse box

was turned off, and that's its importance. Is that a fair summary?

That's correct.

And when you say the word tripped, I mean that would be a circuit breaker that operates to the off position automatically.

We say in the engineering lingo that that means the circuit breaker tripped.

This means the fuse box has become a sort of record of the electrical activity in the early stages of the fire.

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