wrote in message
ups.com...
On 27 Jun, 22:05, "Tam/WB2TT" wrote:

I think there is an inherent safety factor in a system where neither side
of
a 240V circuit is more than 120 V above earth potential. Never heard of a
person being electrocuted who was not standing, or otherwise submerged,
in
water. This costs money.

Its a known deal that 240v is safer than 120 for 2 main reasons.
1. The main killer is not electrocution, it is fire.

That is a sociologic/economic. not technical issue.


2. 240v gives much better discrimination between normal and fault
loads. IOW faults have less chance of tripping a breaker in time on
120v circuits.

I don't know what your load is. The US load per branch circuit is 1800 W,
before the circuit breaker in the box will trip. I think a GFI will trip at
10 microamps.

Tam

NT

Tam/WB2TT wrote:

I think a GFI will trip at 10 microamps.

!!!!!

Graham

On 29 Jun, 00:14, "Tam/WB2TT" wrote:
wrote in message
ups.com...

Its a known deal that 240v is safer than 120 for 2 main reasons.
1. The main killer is not electrocution, it is fire.

That is a sociologic/economic. not technical issue.

I dont see how. Cooking fire risks certainly differ by socio-economic
group, but I dont think electrical fire risks vary much. Things are
perhaps different in the US.


2. 240v gives much better discrimination between normal and fault
loads. IOW faults have less chance of tripping a breaker in time on
120v circuits.

I don't know what your load is. The US load per branch circuit is 1800 W,
before the circuit breaker in the box will trip. I think a GFI will trip at
10 microamps.

20mA is the typical figure for our standard 30mA RCDs, but most fire
causing faults are not detected by RCD, and most properties dont have
an RCD.

But that is a separate issue to fault current discriminaiton.


NT

wrote in news:1183141239.957620.211930
@q69g2000hsb.googlegroups.com:

On 29 Jun, 00:14, "Tam/WB2TT" wrote:
wrote in message
ups.com...

Its a known deal that 240v is safer than 120 for 2 main reasons.
1. The main killer is not electrocution, it is fire.

That is a sociologic/economic. not technical issue.

I dont see how. Cooking fire risks certainly differ by socio-economic
group, but I dont think electrical fire risks vary much. Things are
perhaps different in the US.


The way I see it:

The lower classes see thmselves more as DIYers, even if they are bad at
it.
The lower classes generally cannot afford to have out of date electrical
upgraded to modern standards, so try to bodge what they have to
something they feel is useable, sometimes with disasterous results.

On 29 Jun, 23:28, Gary Tait wrote:
wrote in news:1183141239.957620.211930
@q69g2000hsb.googlegroups.com:
On 29 Jun, 00:14, "Tam/WB2TT" wrote:
wrote in message
oups.com...

Its a known deal that 240v is safer than 120 for 2 main reasons.
1. The main killer is not electrocution, it is fire.

That is a sociologic/economic. not technical issue.

I dont see how. Cooking fire risks certainly differ by socio-economic
group, but I dont think electrical fire risks vary much. Things are
perhaps different in the US.

The way I see it:

The lower classes see thmselves more as DIYers, even if they are bad at
it.
The lower classes generally cannot afford to have out of date electrical
upgraded to modern standards, so try to bodge what they have to
something they feel is useable, sometimes with disasterous results.

Right, things are different here then (UK). Its mostly the upper class
with grand buildings that keep running historic installations. The
less wealthy usually rent rather than own, and laws are much more
stringent than those applying to privately owned dwellings. Capitalism
backwards.


NT

wrote in message
oups.com...
On 29 Jun, 00:14, "Tam/WB2TT" wrote:
wrote in message
ups.com...

Its a known deal that 240v is safer than 120 for 2 main reasons.
1. The main killer is not electrocution, it is fire.

That is a sociologic/economic. not technical issue.

I dont see how. Cooking fire risks certainly differ by socio-economic
group, but I dont think electrical fire risks vary much. Things are
perhaps different in the US.


2. 240v gives much better discrimination between normal and fault
loads. IOW faults have less chance of tripping a breaker in time on
120v circuits.

I don't know what your load is. The US load per branch circuit is 1800 W,
before the circuit breaker in the box will trip. I think a GFI will trip
at
10 microamps.

20mA is the typical figure for our standard 30mA RCDs, but most fire
causing faults are not detected by RCD, and most properties dont have
an RCD.

But that is a separate issue to fault current discriminaiton.



GFCIs have been mandatory here for decades on any receptacle located
outdoors or within a certain distance of water, such as in kitchens and
bathrooms. Modern code is now requiring arc fault interruptors in bedrooms,
and eventually everywhere.