On Thursday, 9 November 2017 03:00:08 UTC, ARW wrote:
On 08/11/2017 19:12, Caecilius wrote:
On Wed, 8 Nov 2017 04:25:30 -0800 (PST), whisky-dave
wrote:


As some might have read we've been supplied with a number of oil filled radaitors

http://cpc.farnell.com/pro-elec/pel0...ack/dp/HG00575

So I unpacked them and installed them, one by one.

In an attempted to trip our 32 amp circuit braker I would have thought that 5 would have done it, but they didn't.

On switch on they started at about 1.6KW (using an old maplin power meter)
I left them fully on, that's the highest setting .

The lab voltage dropped from the 220V to about 202V so that accounts for it I guess.

But what realy suprised me was the power consumption of a radiator when it was full on, anyone care to guess what it was.

Voltage 202

Is that a B32 MCB? If so, it will trip according to the "B" trip
curve, which means that instantanious trip needs at least 3 x rated
current.

At 220v, 5 x 1.6Kw heaters will draw at most about 36A, which will
essentially never trip a B32 MCB.

See the trip curves he

http://wiki.diyfaq.org.uk/index.php?title=MCB




Don't fall for the mixup with B, C and D types.

Let's assume that all 5 heaters are not switched on at exactly the same
time then B rating is irrelevant.

Yes we thopught of that, left them all off for an hour to cool then there was 3 of us 5 rads and we had a countdown we all turned them on full at the same time, and it didn't trip, a couple of hours later it did but there was also a soldering station that;d beeen switched on but it was less than a few 100w .



The B rating covers the inrush current not the stabilised load.

--
Adam