Losing my Dad and my only sibling just three years apart taught me that life is too short and too precious to not enjoy; even if the alternative is the norm. Latex is something I enjoy being in. Many people think it’s weird or strange.
It amuses me that whilst I’m always ready to tweet or post on Facebook or Instagram, I often neglect my blog.
Is it because the platform isn’t particularly nice to work on? well no, actually. WordPress is very easy to update when needed; and unlike some of the other platforms it is good because you can format your posts and decide where the photos are going to be, how they look, and you can even mix video in.
I suppose it’s because, unlike Twitter; Instagram and Facebook, a blog is somewhat like shouting into an empty room. WordPress, whilst one of the world’s biggest community platforms is a massive collection of personal blogs with very little recommendation of “blogs you might like” or “people to follow”. Most of your friends aren’t there, and the cross-blog community is really not good.
The final problem for me, though, is that most of the likes you get on your posts are from “promote your blog” marketing spammers who quite clearly promote your blog by sharing “promote your blog” posts on other people’s blogs and creating clickbots to try and harvest visits. Indeed, I suspect 65% of my meagre following is indeed just clickbots.
I suppose there’s a magic formula to being that person with all the reads, and I definitely don’t fit the criteria, so here is a picture of me using my new laptop table with my Tab S4, whilst a small Tortoiseshell cat hides underneath thus preventing me from actually straightening my legs. You will notice I am wearing a Horace goes Skiing t-shirt.
I know this is nerdy stuff, but today I encountered the highest PSC (Prospective Short-Circuit Current) that I’ve ever encountered on an installation.
23kA was the figure I found, with an external loop impedance of just 0.01A
So, why you ask am I sharing this?
Let me briefly explain.
All breakers have a maximum “breaking capacity”. It’s a number, usually in a box, on the front of the device. Most domestic ones are 6kA, industrial tend to be 10, 12, 15 or even 25.
If a short circuit occurs which takes the fault current above the breaking capacity of the breaker then the breaker may not actually trip, or it might fail, or the it may trip but the spark will then “hop the gap”.
So, what do we do in this circumstance?
Well we could protect the installation with BS1361 fuses, however, that is not guaranteed to get your 0.4 second trip time.
My chosen method is to put an MCCB (Moulded case circuit breaker) with a 25kA breaking capacity into the meter tails. Not only do you then get your 0.4s trip time, but you get a guaranteed trip at high PSC’s.