Group,
Are there any group members who are familiar with the earth leakage
requirements of UL1419 (Standard for Safety - Professional Audio and Visual
equipment) in section 41.1
Our equipment is a detachable power cord connected, class 1 appliance rated at
100 -250 V.
Section 41.1.9 of the standard clearly states that 'Switch S1 as shown in figure
41.1 is used only for direct plug in power supply products that do not employ an
equipment grounding conductor...' (S1 acually open circuits the neutral
conductor)
My three questions are:
- Would they use S1 when leakage testing our type of equipment?
- What is the definition of 'direct plug in' (it is not mentioned in the
definitions section)
- For 'direct plug in' equipment what is the reason for operating this switch
i.e what is the rationale behind the provision of S1.
Any help or comments would be greatly recieved.
Many thanks in advance,
Duncan Hobbs, Product Safety Engineer
Snell and Wilcox Ltd.
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