Recent content by plugwash

IIRC there is a regulation in BS7671 about dividing an installation into circuits to "avoid danger and minimise inconviniance". IIRC in older editions of BS7671 this regulation didn't explicitly mention RCDs, in newer editions it does. Given that in my experiance RCD trips are about as common...

Conversely, the presence of thermal damage to bonding conductors would be a massive alarm bell.

Bonding conductors can carry two types of current. The first is "fault currents", a fault happens somewhere and some proportion of the fault current flows through the bonding system. IIRC in a domestic/light commercial setting, a 6mm² bonding conductor will almost-certainly be enough to handle...

There is clearly the risk that such a device will increase the time from a fault being detected by a RCD to the power being shut down. Particularly in the case of single pole RCBOs. Double pole RCDs/RCBOs mitigate this somewhat but ideally an inverter would not be on the same RCD as any...

The sad fact is there are few cast-iron rules on coding, there is lots of industry guidance but industry guidance is not the law, it's not even BS7671. BS7671 says something along the lines of "installations designed to previous versions of this standard are not necessarily unsafe for continued...

Given the headline says "Make unlimited calls to UK landlines and mobiles with our optional Calls service. " and their FAQ also says they exclude "premium rate" numbers I'd guess they don't want to be bothered with per-minuite phone billing. As well as the technical complexity, IIRC there are...

FTTC and FTTP and dedicated fiber services share the same cables from the exchange to the aggregation node. Beyond that the three systems use seperate cables (though they will almost certainly share ducts and poles). I'm 99% sure that the aggregation nodes were built with FTTP in mind, even...

Yup Afaict there are four parts to an openreach FTTP connection, exchange to aggreation node, aggregation node to splitter, splitter to DP and DP to customer. Exchange to aggregation node was built out as part of the FTTC rollout. Aggregation node to splitter node to DP is normally built out...

Doesn't entirely surpise me. I suspect BT retail assumes that normal residential customers buy their phone and broadband as a bundle. For phone/broadband customers the main way to "encourage" customers to switch seems to have been offering them new deals. and burying in the fine print of those...

The cables from the exchanges to the aggregation nodes are used by both FTTC and FTTP. The cables from the PCP cabinet to the customer are, for the most part, existing cables from the pre-fiber era. That leaves the cables from the aggregation nodes to the FTTC cabinets, the fiber cabinets...

Openreach FTTP is based on GPON. I can't find any specific numbers for openreach's network but a general search suggests that GPON has a specified range limit of 20km but that many communication providers limit it to 16km for reliability. That compares to a max of about 6km for ADSL (and the...

I think I found the answer, thanks to a search term provided by bernard. https://www.ispreview.co.uk/index.php/2025/09/openreach-launches-alternative-uk-analogue-phone-line-product.html I would assume this is what you were migrated to. A VOIP product with the analog <-> VOIP trainsition...

Yes, absense of power in cabinets is not a problem for openreach FTTP. Power is only required at the telephone exchange and customer premesis. (this does not nessacerally apply to non-openreach networks, I'm aware of at least one altnet that does use active cabinets for FTTP)

As I have said before, FTTP does not use cabinets. FTTC goes from a telephone exchange to an "aggregation node" to a "FTTC cabinet" to a "PCP cabinet" to a "DP" to a customer. The aggregation node PCP cabinet and DP are passive, but the FTTC cabinet is active. FTTP goes from the telephone...

The internet is just a network of networks, if your service provider and your VOIP provider are the same company then the VOIP traffic need never leave your provider's network. This can mean they can offer higher reliability than if you use VOIP over the open internet. It's perfectly possible...