On 12/07/2018 15:49, Tim Watts wrote:
On 12/07/18 12:49, Scott wrote:
snip

Must be non combustible or contained in a non combustible enclosure.

(Not sure of the exact wording but basically that ^^)

However, that has been implemented as "metal" for the most part.



IMO they didn't really give manufacturers much option when:

a. they require the CU or its enclosure to be of "non-combustible material"

b. they don't define "non-combustible material

c. they do say "NOTE 1: Ferrous metal, e.g. steel, is deemed to be an
example of a non-combustible material."

Now it may be that I'm expecting too much from the drafters. But that
use of "deemed to be" to me means that there would otherwise be room for
argument that steel is a *not* a non-combustible material for the
purposes of 421.1.201.

I may have missed where the point was discussed while the new reg. was
in draft. But taking the reg. at face value I cannot see manufacturers
taking a chance with another material. After all, perhaps the "deeming"
was felt necessary because a steel CU might well burn if the occupier
stored their medical oxygen cylinders in the cupboard where the CU is
housed. So they'd have to come up with a material which doesn't burn in
pure oxygen.
--
Robin
reply-to address is (intended to be) valid