HANDBOOK REQUIREMENTS - Central Maine Power Company
HANDBOOK REQUIREMENTS - Central Maine Power Company
HANDBOOK REQUIREMENTS - Central Maine Power Company
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42<br />
42<br />
double-throw switch or other transfer device<br />
which meets all<br />
of the following requirements shall be used.<br />
A. When service is transferred, it must be so arranged as to<br />
open all ungrounded conductors from the normal supply<br />
from the <strong>Company</strong> before any connection is made to the<br />
emergency or standby supply.<br />
B. The double-throw switch or transfer device must be so<br />
constructed and connected as to positively prevent any<br />
possibility of power from the customer's emergency source<br />
feeding back into the <strong>Company</strong>'s distribution system.<br />
C. A sign/label shall be placed at the service entrance<br />
equipment (as prescribed by the NEC) indicating the type<br />
and location of the on-site emergency or standby power<br />
sources. CMP highly recommends this sign/label be placed<br />
conspicuously outside of the building on the service<br />
entrance equipment or meter enclosure.<br />
When it is desired to energize all of the customer's<br />
distribution circuits from the emergency or standby source,<br />
the above switch may, if acceptable to the "authority having<br />
jurisdiction," be connected on the line side of the regular<br />
service disconnecting means; provided, in accordance with<br />
the NEC, the equipment is marked as “suitable for use as<br />
service equipment” and is installed per its “listing.”<br />
Additionally, for the case of automatic transfer, there must<br />
be a manual disconnecting means (suitable for use as<br />
service equipment) on the line (CMP) side of the autotransfer<br />
device. This disconnect may be an integral part of<br />
the transfer device. Where equipment is exposed to the<br />
weather, it must be of a raintight construction.<br />
Conductors that may be energized by emergency or<br />
standby generating equipment shall not be located in the