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Contact the manufacturer's support line and ask them!

The MK SPD datasheet says: "MAX. MAINS-SIDE OVERCURRENT PROTECTION 125AgG SHORT-CIRCUIT WITHSTAND CAPABILITY FOR MAX. MAINS-SIDE. OVERCURRENT PROTECTION (ISCCR) 50KA" and their CUs supplied with ready fitted SPD have them connected directly to the main switch

I've done 1000's over 50 years of building scenic flats. Mostly use a table saw, less tiring than a mitre saw as you are not fighting the spring all the time.

Strung between two trees!

No, you are correct. You could get a bit more power at the expense of bandwidth, and as we only used 5330kHz and 4972.5kHz we were happy with that. Accurately cut horizontal dipole aerial with optimum feeder length.

Pi tank coil In the linear amp. Amplifier RF No2 Mk3

Worst one I've had was whilst I was tuning up the tank coil of a WS19HP ,whilst sitting on the metal cased accumulators. Threw me across the room, but no injuries.

For some reason I missed it.

Note also that the RCD's are incorrectly labelled as RCBOs!

I'm not confusing anything, I worked for Reuters at the DTC for 5 years before moving to their HQ in Fleet St. I know exactly what we had there. UPSs on each of the four machine floors, containerised generators on the roof and diversely routed mains supplies for separated substations. Each 19"...

That's what we had (probably still do) at Reuters. Huge banks of lead-acid batteries in each machine room with inverters to bridge the gap whilst the gennies came online.

Generators in large installations are really only useful/intended to allow for a clean shutdown, or to bridge the gap whilst the affected systems are switched over to the alternative grid feed, Oh. wait a minute, there isn't one !

Seems like a case of P^7 to me!

I'm surprised that LHR is not fed from two geographically separated substations with diverse cable routing around the airport, and with the ability to support the entire load from 9ne or other if one fails, as is often done for large data centres.

IMO that's a bit backwards. It's the CCC of the cable that is reduced by a higher Ta, not the current rating of the OPD. Their reasoning is that you have to apply the correction for 3036 fuses that way so you might as well do them all that way. Who uses 3036 fuses these days? As you suggest, I...

You're applying the ambient temperature correction factor to the wrong thing - you apply it to the CCC of the CABLE not the OPD. You just need to check that the corrected CCC of the cable is still >= the OPD rating. The CCC of the cable is 36A method C @30C. You apply the ambient Ca correction...

Without corroborating information, the answer to any question about anything given by anybody, especially on a forum, could be correct or incorrect, regardless of qualifications or otherwise.

I mean people who want 900Mb/s + speeds, not 150M, I have that and it speeds up software updates and video uploads to YouTube very nicely. I started out with Demon Internet and a 300bps acoustic coupler.

Indeed. I can't understand this obsession with bandwidth unless you have a houseful of UHD video streamers and gamers! The ISPs must love it.

Why do you need to drain the main cylinder if the valves are on the primary?