Datasheet

Kanthal Appliance Alloys Handbook 75
10
Surface area per foot A
C / ft
[in
2
/ft]
Based on equation [7] res. [8]
Wire
Strip/ribbon
[8’] A
C / ft
=
2 · (b + t) · 12 = 24 · (b + t)
Weigth per foot [lb/ft]
m = volume · γ = q · l ·
γ ➔ m
ft
= q · γ
Wire
Strip
b · t · γ
· 12
[18’]
m
ft
=
Ribbon
0.92 · b · t · γ
· 12 = 11.04 · b · t ·
γ
[18’]
m
ft
=
Resistance per foot R
20 / ft
[Ω/ft]
Based on equation [1] ➔ R
20 / ft
=
ρ
q
Wire
Strip
Ribbon
Surface area per Ω [in
2
/Ω]
Combining [1’] and [7’] respectively [1’]
and [8’]
Wire
Strip
A
C / ft
R
20 / ft
=
π · d
2
· q ·12 ·10
6
ρ′
=
π
2
· d
3
· 3 ·10
6
ρ′
Ribbon
Imperial units
ρ′
wire’
= Ω /cir.mil foot respectively
ρ′
strip/ribbon
= Ω /square mil foot.
Cross sectional area q [in
2
]
Based on equation [12] [14] res. [15]
Wire
Strip
q = 0.92 · b · t
[15’]
Ribbon
π
q =
4
[12’]
· d
2
q = b · t
[14’]
[7’]
A
C / ft
= π ·
d · 12
[18’]
m
ft
=
π · d
2
· γ
· 12
= π · d
2
· γ
· 3
4
[1’]
R
20 / ft
=
ρ′
d
2
· 10
6
[1’]
R
20 / ft
=
ρ″
b · t · 10
6
[1’]
R
20 / ft
=
ρ″
0.92 · b · t · 10
6
A
C / ft
R
20 / ft
=
2 · (b + t) · b · t ·12 ·10
6
ρ″
=
ρ″
=
24 · (b + t) · b · t ·10
6
A
C / ft
R
20 / ft
=
2 · (b + t) · 0.92 · b · t ·12 ·10
6
ρ″
=
ρ″
22.08 · (b + t) · b · t ·10
6
=