Hi All,

I have an ancient Randall 103 which I am considering digging out to control TV/AV equipment.


I looked up the users guide online, and its rated at 6(2) A.

Anyone any thoughts as to what that means??

6 Amps at mains voltage would be plenty, 2 Amp might still be enough (40€� LCD TV, sound bar, VCR, DVD and about half a dozen SMPS wall warts).

submitted this idea :
I looked up the users guide online, and its rated at 6(2) A.

If it has two outlets, one at 6amp, one at 2amps.

If there is one outlet it could meant 6amps resistive, 2amps inductive.

According to the book, you can use it for mains or €œlow voltage€�.

It maybe that one of the figures is for low voltage, but it would be nice if they explained!

Presumably the kind of load Im talking of would be resistive??

On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and its rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Friday, December 13, 2019 at 4:03:13 PM UTC, John Rumm wrote:
On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and its rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Thanks John,

That should be plenty. I'll just have to check the flex I wired it with and the plug fuse and maybe uprate them, and it should be good to go.

On Friday, 13 December 2019 16:15:15 UTC, wrote:
On Friday, December 13, 2019 at 4:03:13 PM UTC, John Rumm wrote:
On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and its rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.

Thanks John,

That should be plenty. I'll just have to check the flex I wired it with and the plug fuse and maybe uprate them, and it should be good to go.

+1, 6A resistive 2A inductive.


NT

On 13/12/2019 16:03, John Rumm wrote:
On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to
control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and its rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.


But a decent electronic timer will switch on and off as the waveform
crosses zero surely ?. Mechanical ones might cause a momentary buzz,
the ancient one that used to run my baxi bermuda back boiler, and now
switches my hall light on and off does.

On Friday, 13 December 2019 18:56:13 UTC, Andrew wrote:
On 13/12/2019 16:03, John Rumm wrote:
On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to
control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and its rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.


But a decent electronic timer will switch on and off as the waveform
crosses zero surely ?.

I don't see why it would, and zero v does not eliminate inductive kickback.

NT

Mechanical ones might cause a momentary buzz,
the ancient one that used to run my baxi bermuda back boiler, and now
switches my hall light on and off does.

On Friday, 13 December 2019 18:56:13 UTC, Andrew wrote:
On 13/12/2019 16:03, John Rumm wrote:
On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to
control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and it’s rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.


But a decent electronic timer will switch on and off as the waveform
crosses zero surely ?.

I don't see why it would, and zero v does not eliminate inductive kickback.

NT

Mechanical ones might cause a momentary buzz,
the ancient one that used to run my baxi bermuda back boiler, and now
switches my hall light on and off does.

In any case a Randall (Danfoss) 103 is an ancient mechanical time
switch with a microswitch.


--
Graham.

%Profound_observation%

wrote:

On Friday, 13 December 2019 18:56:13 UTC, Andrew wrote:
On 13/12/2019 16:03, John Rumm wrote:
On 13/12/2019 14:01, wrote:
Hi All,

I have an ancient Randall 103 which I am considering digging out to
control TV/AV equipment.

I am assuming that is some kind of (mechanical?) time switch?

I looked up the users guide online, and it's rated at 6(2) A.

Anyone any thoughts as to what that means??

The maximum loads it can switch for resistive and inductive loads. So
for electronic loads of any size you can count that as getting on for 6A
of switching capacity.


But a decent electronic timer will switch on and off as the waveform
crosses zero surely ?.

I don't see why it would, and zero v does not eliminate inductive kickback.

NT

The zero of the voltage waveform does not happen at the same time as the
zero of the current waveform, which is also a consequence of the
inductance. So which do you choose?


Mechanical ones might cause a momentary buzz,
the ancient one that used to run my baxi bermuda back boiler, and now
switches my hall light on and off does.


--

Roger Hayter