Central power supply systemsBS EN 50171: 2001 specifies the general requirements for central power supply systems for an independent energy supply to essential safety equipment. This standard covers systems permanently connected to AC supply voltages not exceeding 1 000 V and that use batteries as the alternative power source. The central power supplies are intended to energize emergency escape lighting in the case of failure of the normal supply, and may be suitable for

7 Timber quality

Further consideration on direct and extended application is given in Annex A

nor to structures which are designed on an experimental basis

chests and bags

Testing labs for fertilizers

Footwear manufacturers

reagent product

• Annex A (informative) Illustration of grading requirements for most commonly used sizes for graded coarse aggregates

square and hexagonal bar

Data fields

Provider-to-provider referrals

and the policies