The question is about the compliance with IET regulation 710.415.2.2, which is included in Section 710 'Medical locations'.
It states that:
the measured resistance between the earth terminal of any socket-outlet (or fixed equipment) and any extraneous-conductive-part shall not exceed 0.7 ohm.
(image extract below)
In clause 9.81, referred to, states:
(a) for IT, TN and TT systems, the voltage presented between simultaneously accessible exposed-conductive-parts and/or extraneous-conductive-parts shall not exceed 25 V a.c. or 60 V d.c.;
Note the International Standard IEC 60364-7-710 states the following:
Question 1 of 2 (question 2 in a separate post)
Hence I consider that the requirements for Group 1 are as below:
0.7Ω maximum resistance within the room between the terminals of the protective equipment conductor of socket outlets and fixed equipment and the EBB, and between any extraneous conductive part and the EBB.
25v maximum touch voltage for systems operating at a.c.
Is this assumption correct?
