AnthonyB

As long as the code isn't required in the direction of escape there would be no automatic issue with doing that.

The biggest issue with no common electricity supply is where the tenants are all on prepayment meters as there is the risk of an extended period of power loss to the system where a resident cannot afford power. However the answer to that is to provide extended back up power supplies beyond the 72 hours normally provided. As you aren't prepayment there isn't this issue and whilst using a landlord supply is preferred it's not a legal requirement and a tenant feed could be used as long as they are recompensed for the usage. As for spurring off your feed that's one for an electrician to

Simple answer - it doesn't! If you immersed the plastic extinguisher in reverse osmosis filtered water, especially warm water, and left it there in the water then gradually tiny amounts of plastic would 'leach' into the water (why you are only meant to use most plastic bottles once) but this has nothing to do with a plastic extinguisher in service.

Sounds like it's a CLASP building for which there are limited practical improvements that can be made to the passive FP issues as they are endemic to the means of construction (they were meant to be temporary and all demolished after 10-15 years). The usual approach is L1 fire alarm, get everyone out and sacrifice the building. The various editions of BB7, the predecessor of BB100, may deal with this, I would have to check my copies in the office. There are some sector guides dealing with what you can do to improve CLASP buildings fire protection, it would be worth casting your eyes

If all the distribution boards and meters are new and compliant with current wiring regulations they should all be made of non combustible housing material and not need further protection. If not then they would need the required fire resistant enclosure, which could be a traditional plasterboard and stud enclosure or a purpose made electrical board enclosure https://envirograf.com/product/electrical-consumer-unit-and-distribution-board-fire-protection-system/

Why is the door being added? If it's a cross corridor door in a corridor with escape in two directions to split the corridor to protect the escape route (required for corridors over 30m under old guidance, 12m in modern guidance) then effectively it needs to be a FD30S door. (In the old days it could be a lower specification fire check door with smoke seals as the main purpose was to protect the corridor from smoke, but now proper spec doors are required) The wall/partition around the door also need to be to 30 mins as well - any ceiling void also needs firestopping/partitioning above the

The green lights are tiny little LEDs in the emergency light fittings indicating a mains supply is entering the unit's battery charger. They are brighter than the red LEDs that used to be used for the same purpose in the past, but it's an integral part of the fitting and not optional. The external lights are 'maintained' emergency light units (i.e. always lit even if the mains supply is working) and I would assume that they have been installed to ensure the stair is lit for use in an emergency without having to mess around looking for a light switch. Minimum light levels are given in B

The outer container is just an alkaline solution of water, sodium bicarbonate and a foaming agent/stabiliser such as saponin, liquorice or turkey red oil. Whilst you shouldn't drink it it's not really that dangerous. The inner container is a water based solution of aluminium sulphate which is mildly toxic and can cause severe eye damage (and damage to metal surfaces) but isn't really deadly. Whilst the chemicals will have degraded over time, they will still react, producing foam under pressure and the cylinder is likely to be in poor condition so just to be safe do not empty it by se

Powder can be used indoors, it's a fallacy that the British Standard bans it, just that a consideration of the effects on discharge should be made in a H&S risk assessment. The medium to large fires thing is a fallacy as portable extinguishers are made (& have been for over 50 years) specifically for smaller fires. Some of the substances you mention fall into the Moderate category for foam destroying action but none are severe. They will destroy a foam blanket, particularly the thin film formed by the non aspirated spray of current extinguishers. Even AR foams have a vas

Sounds like its been connected to a switchable live and not a permanent live. Some domestic lighting circuits are wired so there is only a switchable live from the on/off switch to the light fitting.

Can you sketch the layout? Is the floor all in the same occupancy? How long is the corridor? Are smoke detectors in every room as well as the corridor? It may be OK, but there are several factors to consider first.

Firstly you need to refer to this guidance which covers your situation as many fall into the trap that it's simple as it's 'just a stair': https://www.local.gov.uk/sites/default/files/documents/fire-safety-purpose-built-04b.pdf This will give you the technical background knowledge required for a suitable & sufficient FRA unless your development includes an External Wall System (e.g. cladding) or balconies made from combustible material in which case the guide needs to be supplemented by the current MHCLG guidance: https://www.gov.uk/government/publications/building-safety-advice-for-b

Required in some form since the early 60's. The official guidance (LGA Guide) has a timeline of requirements, mostly in CP3 until 1991 when Approved Document B was introduced. In some cases it was a simple as having openable windows on landings or a permanent vent at the top as oppose to powered auto vents but in anything other than the smallest blocks is been a requirement for decades. Worryingly too many fire risk assessors are ignorant of this and miss it out of their FRAs

The chains are not required anymore and usually Building Regulations only require you to not make conditions worse than under the original Building Regulations approval so like for like would be OK - however the addition of the intumescent strips would be preferred as it vastly increases the efficacy of the door (assuming it's closed!)

The Fireward brand of plastic bodied cartridge operated powder extinguisher was very popular in both the commercial and domestic/leisure/motoring markets with tens of thousands sold under various distributor brands including Betterware, Chubb, Angus and many more. However the natural decay and aging of plastic, particularly where subject to external factors including UV from sunlight, was found to make the shell brittle - furthermore impact damage could cause tiny fractures that could not be readily visually detected. Thus they could sit there fine until operated when they would be subject