Generator Transfer Switch
- Thread starter scottau
- Start date
- Status
davedottcom
Senior Member
Re: Generator Transfer Switch
If the transfer switch is rated for service use it should be considered the disconnect also since it will have 3 positions.
1) Utility
2) Off
3) Generator
Dave
If the transfer switch is rated for service use it should be considered the disconnect also since it will have 3 positions.
1) Utility
2) Off
3) Generator
Dave
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: Generator Transfer Switch
In other words, "yes" and "yes".
In other words, "yes" and "yes".
davedottcom
Senior Member
Re: Generator Transfer Switch
Exactly!
Although, Scottau didn't say if his Transfer switch is rated for service use!
hmmm?
Exactly!
Although, Scottau didn't say if his Transfer switch is rated for service use!
hmmm?
mvannevel
Senior Member
- Location
- Hesperia, Michigan
Re: Generator Transfer Switch
If the transfer switch is service rated and contains overcurrent protection, no disconnect necessary. If it doesn't contain overcurrent protection, you would either need a disconnect with overcurrent protection ahead of it or you could install your protection downstream from the transfer switch "immediately adjacent" to it. This all assumes that the transfer switch can be disconnected manually from both supplies.
If the transfer switch is service rated and contains overcurrent protection, no disconnect necessary. If it doesn't contain overcurrent protection, you would either need a disconnect with overcurrent protection ahead of it or you could install your protection downstream from the transfer switch "immediately adjacent" to it. This all assumes that the transfer switch can be disconnected manually from both supplies.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: Generator Transfer Switch
Must it be an over-current device, or merely a disconnect?
Okay, it looks like you mentioned this after the OR.
[ August 25, 2005, 06:44 PM: Message edited by: LarryFine ]
Must it be an over-current device, or merely a disconnect?
Okay, it looks like you mentioned this after the OR.
[ August 25, 2005, 06:44 PM: Message edited by: LarryFine ]
paul
Senior Member
- Location
- Snohomish, WA
Re: Generator Transfer Switch
From a servicing and testing standpoint, I would recommend a service disconnect before the ATS.
[ August 25, 2005, 07:27 PM: Message edited by: paul ]
From a servicing and testing standpoint, I would recommend a service disconnect before the ATS.
[ August 25, 2005, 07:27 PM: Message edited by: paul ]
Re: Generator Transfer Switch
Scottau,
445.18 Generator shall be equipped with a disconnect.
702.6 Transfer equipment must be suitable for intended use.
You should read both of these short articles yourself.
I don't see where additional disconnects/equipment are needed.
frank
Scottau,
445.18 Generator shall be equipped with a disconnect.
702.6 Transfer equipment must be suitable for intended use.
You should read both of these short articles yourself.
I don't see where additional disconnects/equipment are needed.
frank
Re: Generator Transfer Switch
The issue is not between the generator and the transfer switch, but between the meter and the transfer switch. Article 230 section V and VII.
From what I have been able to find out in this situation the transfer switch can be used as a service disconnect only if it is service rated and has overload protection, otherwise I will need an additional service disconnect.
The issue is not between the generator and the transfer switch, but between the meter and the transfer switch. Article 230 section V and VII.
From what I have been able to find out in this situation the transfer switch can be used as a service disconnect only if it is service rated and has overload protection, otherwise I will need an additional service disconnect.
Re: Generator Transfer Switch
scottau,
You are correct in that the x-fer switch has to be marked correctly to be used as a service disconnect, 230.70(B) and (c).
Also see 230.91 for location of service overcurrent device.
If your x-fer switch meets these criteria it can be considered as the service disconnect.
I believe that mvannevel answered the question quite well.
Pete
scottau,
You are correct in that the x-fer switch has to be marked correctly to be used as a service disconnect, 230.70(B) and (c).
Also see 230.91 for location of service overcurrent device.
If your x-fer switch meets these criteria it can be considered as the service disconnect.
I believe that mvannevel answered the question quite well.
Pete
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