Alpha Node Manuel d'installation télécharger pdf (Page 25)

ONLY qualiﬁ ed personal should connect the utility power. Power must be connected in

compliance with local electrical codes, and common safety practices must be observed.

WARNING!

2.5 Connecting the Utility Power

• Connection to utility power must be approved by the local utility before installing the power supply.

• UL and NEC require that a service disconnect switch (UL listed) be provided by the installer and be

connected between the power source and the Alpha power supply.

• Connection to the power supply must include an appropriate service entrance weather head.

ATTENTION:

Utility power enters the enclosure through an .875" knockout on the side or rear of the NPS. The enclosure

accepts a standard electrical fitting.

A “high-magnetic” trip circuit breaker must be used in order to accommodate the high-inrush currents normally

associated with the start-up of ferroresonant transformers (400A, no-trip, first-half cycle). Do not replace

this circuit breaker with a conventional service entrance circuit breaker. Alpha recommends Square D circuit

breakers for 120V installations, and HACR (heating and air-conditioning) breakers for 240V installations.

Alpha Technologies offers a high-magnetic Square D circuit breaker and a BBX option (a UL Listed service

entrance). Contact your local sales representative for more information.

Description Alpha Part Number Square D Part Number

240V Installation — HACR (15A) 470-224-10 QO215

120V Installation — High-Magnetic (20A) 470-017-10 QO120HM

120V Installation — High-Magnetic (15A) 470-013-10 QO115HM

BBX — External Service Disconnect 020-085-10 QO2-4L70RB

BBX — External Service Disconnect 020-141-10 QO8-16L100RB

Table 2-1, Service Entrance Circuit Breaker Requirements

Alpha recommends 12AWG wiring to accommodate a 90V power supply.

NOTE:

031-295-B0-001 Rev.A

2.0 Installation

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 37 38

Pas de commentaire

Alpha Node Manuel d'installation Page 25