The two rulebooks – BS and NFPA
The short version
- British Standards (BS / BS EN) are written by BSI, the UK's national standards body. Many are European (BS EN) or international (BS EN ISO) standards adopted in the UK.
- NFPA codes and standards are written by the National Fire Protection Association, a US non-profit. They're used across the US and by many US-owned companies and insurers worldwide.
- Dow is a US-headquartered company, so you'll see NFPA referenced a lot on Dow sites, but on a UK site, UK law still applies. Dow's own requirements (CTTs) sit on top of both.
flowchart TD L["⚖️ UK LAW<br/>Regulatory Reform (Fire Safety) Order 2005<br/>'Keep fire equipment maintained'"] --> S S["📘 STANDARDS: HOW to do it<br/>BS / BS EN codes of practice<br/>NFPA codes and standards"] --> C C["🏭 CLIENT RULES<br/>Dow CTT requirements"] --> I I["🛡️ INSURER RULES<br/>e.g. FM Global data sheets, LPC Rules"] --> W W["🔧 What you actually do on site"]
Why there are two rulebooks
UK law (the Regulatory Reform (Fire Safety) Order 2005, often called the FSO or RRO) says fire safety equipment must be maintained in efficient working order and good repair (Article 17). It doesn't say how. The standards fill in the "how".
In the US, NFPA codes become law when a state or city adopts them. The person or body that enforces them is the AHJ, the Authority Having Jurisdiction: a fire marshal, a building inspector, or sometimes the insurer.
A US company like Dow often writes its global engineering rules around NFPA, so the same rules apply on all its sites worldwide. On a UK Dow site you can therefore meet both:
- BS because it's the recognised UK way of showing you met the law.
- NFPA because Dow's corporate standards or insurers call it up.
"Shall" vs "should"
How a sentence is worded tells you how much it matters.
| Word | Means | Where you'll see it |
|---|---|---|
| shall | A requirement. You must do it to comply. | NFPA codes; BS specifications |
| should | A recommendation. Do it unless there's a justified, recorded reason not to. | BS codes of practice (e.g. BS 5306-3, BS 5839-1) |
| may | Permission or an option | Both |
Types of standard
| Type | Example | What it covers |
|---|---|---|
| Product standard | BS EN 3 (portable extinguishers), BS EN 671-1 (hose reels) | How the thing is built and tested in the factory |
| Design / installation standard | BS EN 12845, NFPA 13 (sprinklers) | How a system is designed and installed |
| Maintenance / ITM standard | BS 5306-3, NFPA 10, NFPA 25 | How it's inspected, tested and maintained. This is mostly your job. |
Third-party certification: proving competence
| UK | US | |
|---|---|---|
| Companies | BAFE schemes (e.g. SP101 extinguishers, SP203 fire alarms), LPCB (sprinklers via LPS 1048) | State licensing; UL / FM Approvals listings for equipment |
| Equipment approval marks | LPCB, BSI Kitemark, CE/UKCA | UL Listed, FM Approved |
Editions matter
Standards are revised every few years. NFPA codes are on roughly a 3-year cycle (e.g. NFPA 10 2018 → 2022 → 2025...). The edition called up in the contract or CTT is the one you work to. It isn't always the newest one.
Key takeaways
- Law says "maintain it"; standards say how; Dow CTTs say what Dow wants on top.
- BS = UK/Europe; NFPA = US. On a Dow site you may need both.
- "Shall" = must; "should" = recommended, but you still follow it to comply.
- Always know which document and which edition you're working to.