Re: [PSES] Regulatory requirements for MOVs placed line-to-ground on AC mains ports?

Thanks everyone for the helpful input. If I am understanding the situation correctly, it can be loosely summarized as follows: IEC 60950-1 Clause 1.5.9.2 MOVs connected mains-to-earth or across the mains must have a fuse in series. The fuse must have “adequate breaking

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Re: [PSES] Regulatory requirements for MOVs placed line-to-ground on AC mains ports?

Having had a look at 62368-1 Ed 2, I think the relevant clause in that is 5.5.7. “SPDs” (“Surge Protective Devices”), 5.5.7.1 “Use of an SPD between the mains and earth” “Where a varistor is used between the mains and earth: – the earth connection shall comply with 5.6.7; and – the

Re: [PSES] Regulatory requirements for MOVs placed line-to-ground on AC mains ports?

Hi Joe, IEC60950, clause 1.5.9.2 requires - for the protection of the VDR - "an interrupting means having an adequate breaking capacity shall be connected in series with the VDR" Best regards Kris Carpentier, From: Joe Randolph [mailto:j...@randolph-telecom.com] Sent: dinsdag 31 oktober 2017

Re: [PSES] Regulatory requirements for MOVs placed line-to-ground on AC mains ports?

Joe, I'm away from my data at present. I think IEC 62368-1 in clause 1 states that where a consistent connection to PE/ground cannot be guaranteed, such as with pluggable equipment, protection from mains to the PE requires to be a GDT and varistor to be connected in series. Regards,