RRO & BS5266 definition of "8m²"

[Karissa]

I would be interested in how you folks read this recommendation

From the RRO documentation:

"An emergency escape lighting system should
normally cover the following:
...
• windowless rooms and toilet
accommodation exceeding 8m²;
..."

Is that 8 metres squared (8x8), or 8 square metres (2x4)?

I look forward to your replies

[Meerkat]

I have always read it as the latter - 8 square meteres - i.e. 2m x 4m for exaple.

[nearlythere]

I have always read it as the latter - 8 square meteres - i.e. 2m x 4m for exaple.

8sqM is 4M x 2M or 2.83M ish x 2.83M ish.

[Wiz]

8m² means 8 square metres

Definitely not 8m x 8m.

[Karissa]

That's what I always thought 

Don't you just love clients and 'open to interpretation' and 'how much can I get away with' 

[afterburner]

8m x 8m = 64 square metres surely?

[kurnal]

Lets not forget its a guide though- 8 sq m ish.

There may be reasons to include lighting in some smaller ones with additional hazards and some larger ones may be ok without.

[CivvyFSO]

8m x 8m = 64 square metres surely?

Afterburner, it's a mathematical units thing... Look at it this way.... 8m x 8m = (8 x m) x (8 x m) = (8x8=64) (mxm=m²) = 64m²

Just the same way where if we multiply it by a further 2m in another direction it becomes 128m³. (8x8x2)  (mxmxm)

So in effect, having the "²" there shows that the multiplication has already taken place, if you can see that.

(FWIW I used to look at it your way, sq.m and m² were 2 different things)

[nearlythere]

8m x 8m = 64 square metres surely?

Afterburner, it's a mathematical units thing... Look at it this way.... 8m x 8m = (8 x m) x (8 x m) = (8x8=64) (mxm=m²) = 64m²

Just the same way where if we multiply it by a further 2m in another direction it becomes 128m³. (8x8x2)  (mxmxm)

So in effect, having the "²" there shows that the multiplication has already taken place, if you can see that.

(FWIW I used to look at it your way, sq.m and m² were 2 different things)

If we're done with the 8s can we move on to our 9s times tables please?

9 x 1 is 10
9 x 2 is 3 bananas

This is easy.

[Wiz]

Lets not forget its a guide though- 8 sq m ish.

There may be reasons to include lighting in some smaller ones with additional hazards and some larger ones may be ok without.

You assessors are nothing but trouble! Always fudging the prescription with your oohs, aahs and mmms!

[Karissa]

8m x 8m = 64 square metres surely?

Afterburner, it's a mathematical units thing... Look at it this way.... 8m x 8m = (8 x m) x (8 x m) = (8x8=64) (mxm=m²) = 64m²

Just the same way where if we multiply it by a further 2m in another direction it becomes 128m³. (8x8x2)  (mxmxm)

So in effect, having the "²" there shows that the multiplication has already taken place, if you can see that.

(FWIW I used to look at it your way, sq.m and m² were 2 different things)

If we're done with the 8s can we move on to our 9s times tables please?

9 x 1 is 10
9 x 2 is 3 bananas

This is easy.

If I have two beans, and then I add two more beans, what do I have?

[nearlythere]

8m x 8m = 64 square metres surely?

Afterburner, it's a mathematical units thing... Look at it this way.... 8m x 8m = (8 x m) x (8 x m) = (8x8=64) (mxm=m²) = 64m²

Just the same way where if we multiply it by a further 2m in another direction it becomes 128m³. (8x8x2)  (mxmxm)

So in effect, having the "²" there shows that the multiplication has already taken place, if you can see that.

(FWIW I used to look at it your way, sq.m and m² were 2 different things)

If we're done with the 8s can we move on to our 9s times tables please?

9 x 1 is 10
9 x 2 is 3 bananas

This is easy.

If I have two beans, and then I add two more beans, what do I have?

Not goin to answer that because the obvious answer will be wrong and, despite it being very easily done,  you will make me look stupid. So I am going to sayyyyyyyyyyyyyyyyy 7.

[Phoenix]

8m x 8m = 64 square metres surely?

Afterburner, it's a mathematical units thing... Look at it this way.... 8m x 8m = (8 x m) x (8 x m) = (8x8=64) (mxm=m²) = 64m²

Just the same way where if we multiply it by a further 2m in another direction it becomes 128m³. (8x8x2)  (mxmxm)

So in effect, having the "²" there shows that the multiplication has already taken place, if you can see that.

(FWIW I used to look at it your way, sq.m and m² were 2 different things)

If we're done with the 8s can we move on to our 9s times tables please?

9 x 1 is 10
9 x 2 is 3 bananas

This is easy.

If I have two beans, and then I add two more beans, what do I have?

Not goin to answer that because the obvious answer will be wrong and, despite it being very easily done,  you will make me look stupid. So I am going to sayyyyyyyyyyyyyyyyy 7.

a = b

a² = ab

a² - b² = ab - b²

Factorising is the bit that's not obvious but trust me, the following is logically correct from the foregoing:

(a+b)(a-b) = b(a-b)

Divide by (a-b):

a+b = b

b+b = b

2b = b

2 = 1

QED

Stu

 

[kurnal]

If I have two beans, and then I add two more beans, what do I have?

Some beans.

[nearlythere]

Following the same vein if I had a large green ball in my right hand and a large green ball in my left hand, what would I have?