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Ventilation on live equipment

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Sylvia Else
Guest

Sun May 03, 2020 3:45 am   



I'm building something for use at home that contains a thermistor at
mains potential. It's being used to sense room temperature, so ideally
gets some air flow. I can't find any guidelines/rules regarding how
small any holes need to be to protect against electric shock.

Anyone have some info/links?

Sylvia.

Phil Allison
Guest

Sun May 03, 2020 10:45 am   



Sylvia Else wrote:

===================
Quote:

I'm building something for use at home that contains a thermistor at
mains potential. It's being used to sense room temperature, so ideally
gets some air flow. I can't find any guidelines/rules regarding how
small any holes need to be to protect against electric shock.

Anyone have some info/links?


** It's in the AS/ANZ standard for electrical equipment ( aka AS3100 )

Hole size is not given, only the use a specified, mechanical test finger -about that of a small child - which must not be able to contact live parts.

If you have delicate hands, your own "little finger" is probably close.

https://www.ee.co.za/article/standard-test-finger-tester.html

The Aussie one is the exact same.



...... Phil

Sylvia Else
Guest

Sun May 03, 2020 10:45 am   



On 03-May-20 7:13 pm, Phil Allison wrote:
Quote:
Sylvia Else wrote:

===================

I'm building something for use at home that contains a thermistor at
mains potential. It's being used to sense room temperature, so ideally
gets some air flow. I can't find any guidelines/rules regarding how
small any holes need to be to protect against electric shock.

Anyone have some info/links?


** It's in the AS/ANZ standard for electrical equipment ( aka AS3100 )

Hole size is not given, only the use a specified, mechanical test finger -about that of a small child - which must not be able to contact live parts.

If you have delicate hands, your own "little finger" is probably close.

https://www.ee.co.za/article/standard-test-finger-tester.html

The Aussie one is the exact same.



..... Phil



Thanks for that.


Sylvia.

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