Possible source for Dupla-type cables
Contents:
- re: substrate heating
by "Wehde, Mark B." <MBW01-at-msmail2.mayo.edu> (Tue, 25 Apr 1995)
- That wire source
by Erik Olson <(e-mail)> (Wed, 26 Apr 1995)
- Calculating diy ugh
by dallenb-at-feldspar.com ()
- Cooner Wire
by nitro-at-oeonline.com (Didi Soichin) (Mon, 4 Mar 96)
by "Wehde, Mark B." <MBW01-at-msmail2.mayo.edu>
Date: Tue, 25 Apr 1995
>No way. Dupla charges $90-140 for their cables. The one in my tank, a
>50-watter, makes about two full trips back and forth, making its length
>under 20 feet. That's still half the price Dupla would charge. The key
>is not being stronger than normal wire, the key is being more resistive!
>* Please please tell me the source for this! :) *
The company is:
Cooner Wire
9186 Independence
Chatsworth, CA 91311
818-882-8311
They sell wire they call Miniature Electrode Wire AS 155 Series which is
stranded copper with a silicone rubber insulation.
Part # Wire Gage ohms/foot
AS155-28 28 .066
AS155-29 29 .085
AS155-30 30 .108
AS155-31 31 .145
AS155-32 32 .170
AS155-33 33 .218
AS155-34 34 .272
AS155-36 36 .436
They also sell AS 180 Series wire which is stranded stainless steel with a
silicone rubber insulation.
Part # Wire Gage ohms/foot
AS180-28 28 2.8
AS180-29 29 3.57
AS180-30 30 4.56
AS180-31 31 6.13
AS180-32 32 7.18
AS180-33 33 9.19
AS180-34 34 11.48
AS180-36 36 18.38
AS180-38 38 30.63
AS180-40 40 45.94
They also sell wire they call Bioflex Insulated Wire. It can have either
clear non-hygroscopic fluorocarbon (FEP) or polyvinylchloride (PCV)
insulation. Wire sizes range from 28 - 40 gage with nominal resistance of
..066 to 1.08 ohms / foot for copper wire or 2.8 - 45.94 ohms / foot for
stainless steel wire. It is described as being ultra flexible and suitable
for implantation in vivo. It is multistranded.
I looked at using wire from this company and decided it was more money than
I wanted to spend so I used standard stranded 26 gage copper wire in my
tank. I also ran two lengths of wire and brought all four ends out of the
tank. Now if one wire is broken I will attach my transformer to the other
wire. This seemed a good safety measure to prevent having to tear down a
tank.
Mark
by Erik Olson <(e-mail)>
Date: Wed, 26 Apr 1995/1996
I have created a little length chart given the resistances of the medical
electrode wires posted by Mark Wehde.
Looks promising!
>From: "Wehde, Mark B." <MBW01-at-msmail2.mayo.edu>
>Subject: RE: Heating cable source
>The company is:
Cooner Wire
9186 Independence
Chatsworth, CA 91311
818-882-8311
>They sell wire they call Miniature Electrode Wire AS 155 Series which is
>stranded copper with a silicone rubber insulation.
>...
>They also sell wire they call Bioflex Insulated Wire. It can have either
>clear non-hygroscopic fluorocarbon (FEP) or polyvinylchloride (PCV)
>insulation. Wire sizes range from 28 - 40 gage with nominal resistance of
>..066 to 1.08 ohms / foot for copper wire ...
24V 50W=30W=12W 100W=56W=25W 12V 12V
Part # Gage ohms/ft 30W 24V 18V 12V 24V 18V 12V 30W 50W
1.3A 2A 1.7A 1A 4A 3.4A 2A 2.8A 4A
-----req'd cable length in feet----------------
AS155-32 32 .170 28 17
AS155-33 33 .218 26 22 13
AS155-34 34 .272 42 21 17
AS155-36 36 .436 44 26 13 11
??? 38
??? 40 1.08 18 11 5.3
(The steel wire has too high of a resistance; deleted)
Looks like the best bet for constructing 24-volt cables is 40-gauge (30W),
36-38 gauge (50W), and 34-gauge (100W), scaling appropriately down
for lower voltages. My sister lives a few blocks away from this address,
so perhaps if they're not into shipping I might get her to go pick something
up personally for me.
- Erik
by dallenb-at-feldspar.com
Underground heating cable
power chart
power = v*v/r resistance = v*v/p
watts volt v*v Res Amp
25 6 36 1.440 4.167
25 12 144 5.760 2.083
25 24 576 23.040 1.042
50 6 36 0.720 8.333
50 12 144 2.880 4.167
50 24 576 11.520 2.083
75 6 36 0.480 12.500
75 12 144 1.920 6.250
75 24 576 7.680 3.125
100 6 36 0.360 16.667
100 12 144 1.440 8.333
100 24 576 5.760 4.167
length of cable require in meters
based on 1 to 2 watts per 10 litre of water
5 7 9 11 13 15 17 20
Watts Required resistance per meter
25 0.288 0.206 0.160 0.131 0.111 0.096 0.085 0.072
25 1.152 0.823 0.640 0.524 0.443 0.384 0.339 0.288
25 4.608 3.291 2.560 2.095 1.772 1.536 1.355 1.152
50 0.144 0.103 0.080 0.065 0.055 0.048 0.042 0.036
50 0.576 0.411 0.320 0.262 0.222 0.192 0.169 0.144
50 2.304 1.646 1.280 1.047 0.886 0.768 0.678 0.576
75 0.096 0.069 0.053 0.044 0.037 0.032 0.028 0.024
75 0.384 0.274 0.213 0.175 0.148 0.128 0.113 0.096
75 1.536 1.097 0.853 0.698 0.591 0.512 0.452 0.384
100 0.072 0.051 0.040 0.033 0.028 0.024 0.021 0.018
100 0.288 0.206 0.160 0.131 0.111 0.096 0.085 0.072
100 1.15 0.823 0.640 0.524 0.443 0.384 0.34 0.288
wire size
Gauge Dia-mm R/mtr Res/1000'
26 0.405 0.137 41.6
27 0.361 0.172 52.5
28 0.321 0.217 66.2
29 0.286 0.274 83.4
30 0.255 0.345 105.2
31 0.227 0.436 132.7
32 0.202 0.516 157.3
33 0.180 0.693 211.0
34 0.160 0.873 266.0
Hammond Transformers as listed 1994
(available at most electrical suppliers)
volts 2amps 3amps 4amps 5amps 6amps 8amps 10amps
6.3 166L6 166N6 165Q6 165S6
($13) ($17) ($22) ($29)
12.6 166L12 166N12 166Q12 165R12 165S12
($16) ($25) ($30) ($26) ($37)
25 166L25 165M25 165N24 165P25 165S25
($12) ($25) $(27) ($36) ($50)
These prices are in Canadian $ from Electrosonic catalog
they sould be used as a guide only. The gaps could be filled
with other manufactures.
example.
tank 255 ltr length = 122cm
hight = 46cm width = 44cm
gravel 10cm volume 122x36x44 = 193ltr
length of cable = 122x(44/6)+(50x2) = 10.9 metres.
Wattage required 192/10 = 19.3 at 1 watt/10ltr or 38.6 watts at 2w/10ltr
lower wattage(20):
under 11 mtr length of cable 2 options .131 or .524 ohms/mtr. I would choose
the highest voltage possible. 12 volts at .524 ohm/mtr at 2 amps, now look
at wire size available for .524; Nearest is .516 ohm/mtr and wire size of 32
gauge. Transformer is 166N12 rated at 4 amps.(actual 27.9 watts)
higher wattage(40):
11 metre length .262 ohms/mtr at 12 volts 4 amps. wire size .274 29 gauge
wire, transformer 166Q12 6 amps. (actual 52 watts)
Doug Bardell
Garson, Ont, Ca.
by nitro-at-oeonline.com (Didi Soichin)
Date: Mon, 4 Mar 96
Well, I received today in the mail two samples of wire from Cooner
Wire. I read about them in the Krib/Plants/Tech series of articles on
DIY substrate heating so I gave them a call. The gentleman I've spoke
with was extremely helpful and sent me samples of the silicone rubber
coated and the PVC coated one, both in 36 gauge. Unfortunately they
are very, very thin (O.D. .0258, it doesn't say if that's inches or
mm). I was hoping they would be similar to the EKG hook-up wire that I
have at work, which is a thick 1/8" silicone coated. The Dupla ones
are 1/8" too so, until I setup the big tank, bye-bye substrate heating
:-(
Didi Soichin
nitro-at-oeonline.com
Westland, MI, USA
The Krib
Plants
Plants