What is stray capacitance ?
-Original Message-
From: Rich Nute [mailto:ri...@sdd.hp.com]
Sent: Monday, July 08, 2002 3:58 PM
To: Product Safety Technical Committee
Subject: Re: TOUCH CURRENT LIMIT
UL reasoned that if 0.5 mA arises from both real and stray capacitance,
then, for double
I think that is correct - but it went from IEC 380 through IEC 435 to IEC
950
I should have a copy of the UL478 and CSA..220 standards that we used for
ITE at the time - from memory I cannot remember what they said but if I find
them I will post their requirements.
Best regards
Gregg
(0)1382-622243.
-
Touch current limit for accessible parts and circuits not connected
to protective earth: 0.25 mA
question 1 : How does it (0.25mA) come from and what it is based on?
The UL reasoning is faulty because in real life the two capacitances
need not be equal
Hi Xing Weibing:
We can read from table 5A of IEC60950:1999:
Touch current limit for accessible parts and circuits not connected
to protective earth: 0.25 mA
question 1 : How does it (0.25mA) come from and what it is based on?
For grounded (Class I) equipment for the home, the UL
: Ron Pickard rpiclek...@hypercom.com
To: xin...@cesi.ac.cn
Cc: emc-p...@majordomo.ieee.org
Sent: Tuesday, June 25, 2002 11:50 PM
Subject: Re: TOUCH CURRENT LIMIT
Hi Xing,
Find my comments below marked with ***.
Your email stated:
Our test lab receive a CB TEST REPORT FOR NATIONAL
Hi Xing,
Find my comments below marked with ***.
Your email stated:
Our test lab receive a CB TEST REPORT FOR NATIONAL RECOGNIZATION,
the EUT is a class II ac adapter having a bridging capacitor (4700pF)across
the reinforced
insulation
The touch current measured by CB is 0.17mA(4700pF
...@majordomo.ieee.org
Sent: Tuesday, June 25, 2002 6:38 PM
Subject: RE: TOUCH CURRENT LIMIT
Xing,
Yes, 0.25mA is very strict for 950. However, I can assure you that depeding on
the test lab and uncertainty of the test equipment, you will obtain slightly
different results.
This e-mail message may contain
, 2002 11:57 AM
To: Peter Merguerian
Cc: emc-p...@majordomo.ieee.org
Subject: Re: TOUCH CURRENT LIMIT
Hi Mr. Peter:
Our test lab receive a CB TEST REPORT FOR NATIONAL RECOGNIZATION,
the EUT is a class II ac adapter having a bridging capacitor (4700pF)across
the reinforced insulation
The touch
]
Sent: Tuesday, June 25, 2002 11:13 AM
To: Robert Johnson; Peter Merguerian
Cc: emc-p...@majordomo.ieee.org
Subject: Re: TOUCH CURRENT LIMIT
Dear SIRS:
Thanks for your e-mail
A further question for touch current:
Is it (0.25mA) strict for Class II equipment ?
0.28mA rms is OK FOR IEC60065
Sent: Tuesday, June 25, 2002 6:38 PM
Subject: RE: TOUCH CURRENT LIMIT
Xing,
Yes, 0.25mA is very strict for 950. However, I can assure you that depeding
on the test lab and uncertainty of the test equipment, you will obtain slightly
different results.
This e-mail message may contain
: Peter Merguerian
To: 'xingwb' ; emc-p...@majordomo.ieee.org
Cc: Ilan Cohen ; Michael G ; Shmuel Gnatt ; Sima Beloborodov ; Valery
Rodionov
Sent: Monday, June 24, 2002 9:00 PM
Subject: RE: TOUCH CURRENT LIMIT
Xing Hello!
ake a look at IEC 60990, Methods of measurement of touch
CURRENT LIMIT
Dear colleagues
I have a question regarding touch current limit of IEC 60950?
We can read from table 5A of IEC60950:1999:
Touch current limit for accessible parts and circuits not connected
to protective earth: 0.25 mA
question 1 : How does it (0.25mA) come from
...@cesi.ac.cn]
Sent: Monday, June 24, 2002 1:57 AM
To: emc-p...@majordomo.ieee.org
Cc: Rich Nute
Subject: TOUCH CURRENT LIMIT
Dear colleagues
I have a question regarding touch current limit of IEC 60950?
We can read from table 5A of IEC60950:1999:
Touch current limit for accessible parts
body, as well as a list of references.
Regards,
Jon Griver
www.601help.com
The Medical Device Developers Guide to IEC 60601-1
--- Forwarded message follows ---
Dear colleagues
I have a question regarding touch current limit of IEC 60950?
We can read from table 5A of IEC60950:1999:
Touch
Dear colleagues
I have a question regarding touch current limit of IEC 60950?
We can read from table 5A of IEC60950:1999:
Touch current limit for accessible parts and circuits not connected
to protective earth: 0.25 mA
question 1 : How does it (0.25mA) come from and what it is based
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