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49 Component Power Measurement Test8 h8 a3 t; v0 c6 n. S3 ~$ X' G
49.1 To determine if a component or a circuit of a seasonal lighting product is capable of delivering 157 j7 b/ T" d2 b- H& D
watts of power for one minute (see 48.1, Exception No. 1(c)), the component shall be tested as described
! a3 u0 L- z# kin 49.2 – 49.4.
' u$ G% r: V; O' b5 o9 m Z49.2 The unit is to be connected to a 60 Hz, 120 V supply source. One component or circuit of the unit8 U% Y+ x" W: t# C! {
is to be connected to a wattmeter and an adjustable external load resistor as illustrated in Figure 49.1.
. c( } D% T9 M" R6 L7 y `The external load resistor is to be set for its maximum resistance. A closed shorting switch is to be
: G) j/ R% ^$ S% E8 E5 kconnected across the unit’s protective device, such as a fuse, and the resistor is then to be adjusted to! q0 `6 O1 T. p4 |9 l" X" N
cause a power dissipation of exactly 15 watts as indicated by the meter. The shorting switch across the' L0 i' ^( q, \; @4 E, _
protective device is then to be opened and the time required for the protective device to open is to be$ m" r8 Z' {. H0 f0 F+ n
recorded.
6 d, a( J, a7 [1 `; x* }& k8 n49.3 During the test, the supply circuit is to be protected by a 20 A time delay fuse, with characteristics
/ ^, h/ W* s' F$ Qsuch that the fuse will not open in less than 12 seconds when carrying 40 A.1 G3 N& I# X* A0 ~& M. z
49.4 The point of measurement of the circuit (see Figure 49.1) is not considered capable of delivering 15
: z5 Y4 ?' i" O/ x* a6 U3 Rwatts for one minute if:
* D5 h$ h u& \2 V4 b; ba) The protective device of the unit opens in less than 60 seconds,
Y5 t/ w6 j% o8 [: wb) A circuit component opens in less than one minute, or1 u8 G5 S, E2 S1 o( N& u2 z
c) The current is inherently limited by the circuit. |
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